Manuals+

Sub-Zero ICBBI-42UFDID Troubleshooting

This guide provides detailed troubleshooting steps for various fault codes and general issues encountered with Sub-Zero built-in appliances, specifically the ICBBI-42UFDID model.

Built-In Fault Code Troubleshooting Guide

CodeService Icon StateDescription and Action
10 1 00OnRefrigerator cabinet thermistor open. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 1 01OnRefrigerator cabinet thermistor shorted. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 1 02OnRefrigerator cabinet thermistor unstable. Check for bad connections and/or damaged wires. Repair connection or wire.
10 2 00OnFreezer cabinet thermistor open. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 2 01OnFreezer cabinet thermistor shorted. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 2 02OnFreezer cabinet thermistor unstable. Check for bad connections and/or damaged wires. Repair connection or wire.
10 3 00OnCondenser thermistor open. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 3 01OnCondenser thermistor shorted. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 3 02OnCondenser thermistor unstable. Verify temperature reading. Replace control board if temperature is not correct.
10 3 10This code is inactive. Please ignore.
10 3 11This code is inactive. Please ignore.
10 3 12This code is inactive. Please ignore.
10 7 00Ambient thermistor open. Verify temperature reading. Replace control board if temperature is not correct.
10 7 01Ambient thermistor shorted. Verify temperature reading. Replace control board if temperature is not correct.
10 7 02Ambient thermistor unstable. Verify temperature reading. Replace control board if temperature is not correct.
10 F 00OnFreezer evaporator thermistor open. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 F 01OnFreezer evaporator thermistor shorted. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 F 02OnFreezer evaporator thermistor unstable. Check for bad connections and/or damaged wires. Repair connection or wire.
10 r 00OnRefrigerator evaporator thermistor open. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 r 01OnRefrigerator evaporator thermistor shorted. Verify temperature reading and ohm thermistor. Replace thermistor if bad.
10 r 02OnRefrigerator evaporator thermistor unstable. Check for bad connections and/or damaged wires. Repair connection or wire.
10 r 09Refrigerator evaporator thermistor read higher than cabinet thermistor by at least 10 degrees. Error may indicate problem with thermistor or a unique evaporator issue.
15 1 00Flash with ChimeRefrigerator compressor relay stuck open. No power to compressor. Verify refrigerator compressor relay stuck open. Replace control board.
15 1 01Flash with ChimeRefrigerator compressor relay stuck closed. Power to compressor at all times. Verify refrigerator compressor relay stuck closed. Replace control board.
15 2 00Flash with ChimeFreezer compressor relay stuck open. No power to compressor. Verify freezer compressor relay stuck open. Replace control board.
15 2 01Flash with ChimeFreezer compressor relay stuck closed. Power to compressor at all times. Verify freezer compressor relay stuck closed. Replace control board.
15 4 00OnVerify freezer compressor relay stuck closed. Replace control board.
15 4 01FlashDefrost relay is stuck open. No power to defrost heater. Verify defrost relay is stuck open. Replace control board.
15 8 00Ice maker relay is stuck open. No power to ice maker. Verify ice maker relay is stuck open. Replace control board.
15 8 01Flash with ChimeIce maker relay is stuck closed. Power to ice maker at all times. Verify ice maker relay is stuck closed. Replace control board.
15 8 10Ice accessories relay is stuck open. No power to ice accessories. Verify ice accessories relay is stuck open. Replace control board.
15 8 11Ice accessories relay is stuck closed. Power to ice accessories at all times. Verify ice accessories relay is stuck closed. Replace control board.
15 9 00Dispenser auger relay is stuck open. No power to auger. Verify dispenser auger relay is stuck open. Replace control board.
15 9 01OnAuger relay is stuck closed. Power to auger at all times. Verify auger relay is stuck closed. Replace control board.
15 9 05Water valve selecting relay stuck at dispenser water position. Ice making system disabled. Replace control board.
15 9 65Water valve selecting relay stuck at ice maker water position. Replace control board.
15 9 66Water valve selecting relay stuck at ice maker water position. Replace control board.
15 L 00Main lights relay is stuck open. Power to lights at all times. Verify main lights relay is stuck open. Replace control board.
15 L 01Main lights relay is stuck closed. No power to lights. Verify main lights relay is stuck closed. Replace control board.
15 L 55This code is inactive. Please ignore.
15 L 56This code is inactive. Please ignore.
15 U 00Water valve relay is stuck open. No power to water valve. Verify water valve relay is stuck open. Replace control board.
15 U 01Flash with ChimeWater valve relay is stuck closed. Power to water valve at all times. Verify water valve relay is stuck closed. Replace control board.
15 U 10Water check valve relay is stuck open. No power to water check valve. Verify water check valve relay is stuck open. Replace control board.
15 U 11Water check valve relay is stuck closed. Power to water check valve at all times. Verify water check valve relay is stuck closed. Replace control board.
20 2 00OnDefrost bi-metal stuck open. Verify the bimetal is open below -1°C. Replace if necessary.
20 2 01OnDefrost bi-metal stuck closed. Verify the bi-metal is closed above 13°C. Replace if necessary.
20 2 05Mis-wired bi-metal. Normal temperatures during defrost, but inappropriate response from bi-metal. Check wiring and bi-metal mounting.
20 2 06OnMis-wired bi-metal. High temperatures during defrost, and inappropriate response from bi-metal. Check wiring and bi-metal mounting.
20 2 07Defrost bi-metal error. Check bi-metal ohms. Replace defrost heater if necessary.
20 2 50OnDefrost heater open.
30 8 00Verify wiring and defrost heater. Check defrost heater ohms. Replace defrost heater if necessary.
30 8 05Ice accessories open circuit. Check wiring for fill tube heater and mullion chute heater.
30 8 10No signal from ice maker for fill. Check wiring and power to the ice maker.
30 8 15Ice maker open circuit. Check power and wiring to ice maker.
30 8 30Flash with ChimeWater valves not opened, but water flow observed by the flow meter. Confirm water pressure is above 34.5 kPa. Inform customer if not.
30 9 01Bulk ice switch stuck closed. Bulk ice switch pressed or closed for more than five seconds with door closed. Inspect bulk ice switch and wiring.
30 9 10Dispenser auger open. Check wiring and power to auger motor.
30 9 80Check communications cable to dispenser.
30 9 86Dispenser chute motor timed out. Chute motor failed to reach open or closed position. Verify motor and chute are moving freely and not jammed or blocked. Replace dispenser assembly if necessary.
30 U 00Water valve open. Check wiring and power to water valve. Check solenoid ohms.
30 U 10Dispenser water valve open. Check wiring and power to water valve. Check solenoid ohms.
30 U 20Water check valve open circuit. Solenoid is open.
35 3 00This code is inactive. Please ignore.
35 3 35This code is inactive. Please ignore.
35 A 36Check air filter fan is connected properly and functioning.
35 A 37Check air filter fan is connected and no shorts are evident.
35 F 33Check freezer evaporator fan for obstructions that cause inability to achieve full speed.
35 F 34Verify freezer evaporator fan not shorted. If the fan is shorted, it runs faster than the speed setting.
35 r 33Check refrigerator evaporator fan for obstructions that cause inability to achieve full speed.
35 r 34Verify refrigerator evaporator fan not shorted. If the fan is shorted, it runs faster than the speed setting.
40 1 38Refrigerator stepper valve communication fault. Replace control board.
40 1 40OnVerify performance of unit and check for door leaks, door ajar, icing of evaporator, and proper charge in system.
40 2 38Freezer stepper valve communication fault. Replace control board.
40 2 40OnExcessive freezer compressor run time. Verify performance of unit and check for door leaks, door ajar, icing of evaporator, and proper charge in system.
40 8 40Ice maker ran for maximum fill time without achieving necessary volume. Check for water system blockages, kinked water lines, and proper water pressure.
40 9 40Dispenser active for maximum fill time. Verify no stuck keys or flooding.
40 b 38Baffle stepper communication fault. Replace control board.
44 0 00Glass door heater open circuit. Check wiring and power to heater.
44 0 01Glass door heater short circuit. Check wiring and power to heater.
44 9 42One-watt glass well heater not detected.
44 9 43Four-watt glass well heater not detected. Check wiring and power to heater.
45 1 00Main refrigerator lights open circuit. Check lights and wiring.
45 1 01Main refrigerator lights short circuit. Check lights and wiring.
45 2 00Main freezer lights open circuit. Check lights and wiring.
45 2 01Main freezer lights short circuit. Check lights and wiring.
45 A 45Air FilterFlashing Air filter light burned out. Replace air filter cartridge.
45 L 00Accent lights open circuit. Check lights and wiring.
45 L 01Accent lights short circuit. Check lights and wiring.
50 U 80Water flow meter not detected. Verify power and wiring to flow meter assembly. If power and wiring are good, replace the isolation valve (includes the flow meter).
50 U 86Water flow meter detected low flow. Verify water pressure and check for any water system obstructions.
50 U 87Water flow meter did not detect flow. Verify water pressure, water flow, and that flow meter is not blocked or dirty.
60 1 02Refrigerator variable speed compressor communication error. Replace the control board.
60 1 38Refrigerator variable speed compressor communication error. Replace the control board.
60 1 60OnNo refrigerator compressor load detected. Check compressor electricals and wiring.
60 2 02Freezer variable speed compressor communication error. Replace the control board.
60 2 38Freezer variable speed compressor communication error. Replace the control board.
60 2 60OnNo freezer compressor load detected. Check compressor electricals and wiring.
90 0 70Flash failure. Reconfigure control board. Replace control board if reconfiguration fails.
90 0 71Flash failure. Reconfigure control board. Replace control board if reconfiguration fails.
90 0 72Flash failure. Reconfigure control board. Replace control board if reconfiguration fails.
90 0 73Flash failure. Reconfigure control board. Replace control board if reconfiguration fails.
90 0 74Flash failure. Reconfigure control board. Replace control board if reconfiguration fails.
90 0 75Flash failure. Reconfigure control board. Replace control board if reconfiguration fails.
90 0 81Microcontroller fault. Replace control board if the fault is active.
90 0 90Microcontroller fault. Replace control board if the fault is active.
90 0 92Microcontroller fault. Replace control board if the fault is active.
90 0 93Microcontroller fault. Replace control board if the fault is active.
90 3 38This code is inactive. Please ignore.
90 3 55Condenser fan triac open.
90 3 56Condenser fan triac shorted. Verify condenser fan operation. Replace control board if fault is active.
90 5 01Key shorted or damaged on display. Verify key performance. Replace display if needed.
90 5 38On12 VDC fan power output fault. Verify constant 12 VDC to evaporator fan. Replace control board if fault is active.
90 5 39This code is inactive. Please ignore.
90 5 44Glass door heater output fault. Check wiring and power to glass door heater. Replace control board if fault is active.
90 5 80No keypad communications. Check wiring and key performance of display. Replace display if needed.
90 5 85Display failure. Replace display.
90 5 95Key shorted or damaged on display. Check wiring and key performance of display. Replace display if needed.
90 5 96Key shorted or damaged on display. Check wiring and key performance of display. Replace display if needed.
90 5 97Display microcontroller problem. Check wiring and key performance of display. Replace display if needed.
90 5 99Display error. Check wiring and key performance of display. Replace display if needed.
90 9 80No communications with door dispenser. Check proper model configuration. Check wiring to the dispenser.
90 A 38Air filter fan output fault on control board. Replace control board if fault is active.
90 A 56This code is inactive. Please ignore.
90 b 80No stepper microcommunication. Replace control board.
90 F 38OnFreezer evaporator fan output fault on control board. Verify if fan is working. Replace control board if fault is active.
90 Η 80OnCommunication problems on control board. Replace control board.
90 Η 82Intermittent communications on control board. Replace control board.
90 Η 83Communication problems on control board. Replace control board.
90 Η 84Initialization fault. Power unit off then on, and verify if code remains active. Replace control board if fault is active.
90 L 38Check if accent lights are working. Replace control board if fault is active.
90 r 38OnRefrigerator evaporator fan output fault. Verify fan operation. Replace control board if fault is active.
95 1 25Verify refrigerator evaporator is cooling properly when compressor is on. Check sealed system charge if not.
95 2 25Verify freezer evaporator is cooling properly when compressor is on. Check sealed system charge if not.
95 1 00Refrigerator compressor microprocessor pin stuck in off position. Replace control board.
95 1 01Refrigerator compressor microprocessor pin stuck in on position. Replace control board.
95 2 00Freezer compressor microprocessor pin stuck in off position. Replace control board.
95 2 01Freezer compressor microprocessor pin stuck in on position. Replace control board.
98 0 98Brownout conditions were detected.
d0 OrIf the door of a Built-In French door model with an internal dispenser is left open for more than five minutes when is off, "d0" and "Or" appear on the display and the alarm chimes. When the door closes, the alarm stops. The display is disabled for five minutes after the door closes.
H2 LOIf the control board on a Built-In dispenser model senses that 3.8 liters of water have been dispensed in 15 minutes, or that the dispenser water valve has been energized for 150 seconds, "H2" and "L0" appear on the display for five seconds, and three chimes sound when the water dispense button is pushed. Water dispensing pauses for 45 minutes. To bypass the 45-minute dispensing interruption on external dispensers, touch and hold the dispenser light key for five seconds. The dispenser chimes twice. To bypass the 45-minute dispensing interruption on internal dispensers, press the water paddle five times in 20 seconds. The dispenser chimes twice.
LO CIf the control board determines that the display icons have been tapped while the door is closed, it locks the control panel. "LO" and "C" appear on the display. To unlock the control panel, correct the problem causing the error, disconnect the power to the unit, and reconnect it. Within five minutes after power is restored, touch and hold, then tap either twice.

General Troubleshooting

ProblemDisplayTest/Action
Warm or erratic temperatures without illuminated or flashing.No power to the unit. Check plug and circuit breaker. Display shows "0" and "FF." Tap. Unit in Showroom mode. Tap to turn unit off. Touch and hold either set of and tap. Temperature setpoint is too high. Lower the setpoint. Large amount of warm food in the unit. Instruct customer. Control board configured for the wrong model. Reconfigure unit. Use Fault Code Recall mode to access fault codes and the Fault Code Troubleshooting guide to address problem.
steady, flashing, or flashing with chime.Water supply issue causing the ice maker water valve and isolation valve to be held open longer than 35 seconds. Check the electrical connections, voltage, water supply, filter, and water lines.
flashing with no ."EE" on display means that the refrigerator or freezer cabinet thermistor is open or shorted.
"EE" shown on the display on either the freezer or refrigerator side.
shown on display.Water filter has expired. Replace the water filter and press and hold the filter reset button for five seconds. The icon disappears from the display.
flashing on display.Air purification filter has expired. Replace the air purification filter and touch and hold for five seconds to reset the air purification timer.
"SA" and "b" shown on display.Unit in Sabbath mode. Tap to exit Sabbath mode.
"- -" on display in place of temperature.Refrigerator or freezer zone disabled. Enable zone by tapping and touch and hold for the

Unit Temperatures and Thermistors

Built-In Refrigerator Compartment Thermistor

The refrigerator compartment (r) thermistor senses the refrigerator compartment temperature and relays it to the control board.

Thermistor ConditionAction
Open or shortedEE on display. Service wrench icon flashes. Fault code logged. Compressor faults to 20 minutes on and 40 minutes off.
High temperature offset reachedHigh speed run command sent to refrigerator evaporator fan.
Display temperatureChanges one degree per minute; is an average of compartment thermistor readings.
Sabbath mode15- to 25-second delay before compressor starts.
Refrigerator compartment below 2°CDefrost time extended before starting evaporator fan.

Refrigerator Compartment Thermistor Test

  1. Turn off power to the unit.
  2. Follow the procedure in Component Removal and Installation to expose the refrigerator cabinet thermistor.
  3. Follow the procedure in Component Removal and Installation to expose the control board.
  4. Remove the thermistor harness from the control board.
  5. Place the thermistor into an ice bath of 0°C. Let the thermistor sit for five minutes, stirring occasionally.
  6. Measure the resistance of the thermistor through the control board connector.
  7. If thermistor is outside the normal range of 30,000 to 33,000 ohms, replace it.

Built-In Refrigerator Evaporator Thermistor

The refrigerator evaporator (rE) thermistor senses the refrigerator evaporator temperature and transmits it to the control board.

Thermistor ConditionAction
Open or shortedEE for "rE" thermistor in diagnostics. Service wrench icon flashes. Fault code logged. Compressor not energized until compartment temperature is 3°C above high offset.
Freezer evaporator temperature above 2°C after defrostEvaporator fan does not start.

Refrigerator Evaporator Thermistor Test

  1. Turn off power to the unit.
  2. Follow the procedure in Component Removal and Installation to expose the refrigerator evaporator thermistor.
  3. Remove the thermistor from the refrigerator evaporator.
  4. Follow the procedure in Component Removal and Installation to expose the control board.
  5. Remove the thermistor harness from the control board.
  6. Place the thermistor into an ice bath of 0°C. Let the thermistor sit for five minutes, stirring occasionally.
  7. Measure the resistance of the thermistor through the control board connector.
  8. If thermistor is outside the normal range of 30,000 to 33,000 ohms, replace it.

Built-In Freezer Cabinet Thermistor

The freezer cabinet (F) thermistor senses the freezer cabinet temperature and transmits it to the control board.

Thermistor ConditionAction
Open or shortedEE on display. Service wrench icon flashes. Fault code logged. Compressor on 20 minutes and off 20 minutes.
High temperature offset reachedCompressor energized, unless in defrost five-minute delay.
Display temperature shows an average of compartment thermistorChanges one degree per minute.
Sabbath mode15- to 25-second delay before compressor starts.
Low offsetCompressor and evaporator fan stopped.
During adaptive defrostFreezer temperature display is locked.

Freezer Cabinet Thermistor Test

  1. Turn off power to the unit.
  2. Follow the procedure in Component Removal and Installation to expose the freezer cabinet thermistor.
  3. Remove the thermistor from the freezer compartment clip.
  4. Follow the procedure in Component Removal and Installation to expose the control board.
  5. Remove the thermistor harness from the control board.
  6. Place the thermistor into an ice bath of 0°C. Let the thermistor sit for five minutes, stirring occasionally.
  7. Measure the resistance of the thermistor through the control board connector.
  8. If thermistor is outside the normal range of 30,000 to 33,000 ohms, replace it.

Built-In Freezer Evaporator Thermistor

The freezer evaporator (FE) thermistor senses the freezer evaporator temperature and transmits it to the control board, where it operates the evaporator fan.

Thermistor ConditionAction
Open or shortedEE for "FE" thermistor in diagnostics. Service wrench icon flashes. Fault code logged. Compressor energized after five-minute defrost delay, and evaporator fan three minutes later.
Freezer evaporator temperature above 2°C after defrostEvaporator fan does not start.

Freezer Evaporator Thermistor Test

  1. Turn off power to the unit.
  2. Follow the procedure in Component Removal and Installation to expose the freezer evaporator thermistor.
  3. Remove the thermistor from the freezer evaporator.
  4. Follow the procedure in Component Removal and Installation to expose the control board.
  5. Remove the thermistor harness from the control board.
  6. Place the thermistor into an ice bath of 0°C. Let the thermistor sit for five minutes, stirring occasionally.
  7. Measure the resistance of the thermistor through the control board connector.
  8. If thermistor is outside the normal range of 30,000 to 33,000 ohms, replace it.

Component

Built-In Condenser Fan Testing

The control board monitors the power output to both compressors, and if either compressor is energized, the control board closes the condenser fan relay/triac and supplies the condenser fan with voltage. See the Technical Data section for condenser fan rating.

  1. While the condenser fan is running, stop the condenser fan blade and determine if the condenser fan restarts. Repeat this test at least six times. If the condenser fan does not start or starts slowly, replace the condenser fan.
  2. Disconnect the electrical connector from the condenser fan, and measure the resistance of the condenser fan. The resistance should be approximately 17 megaohms.
  3. Connect the electrical connector and check for correct voltage on the hot lead on the condenser fan connector to ground.
  4. Check for no voltage from the return lead on the condenser fan connector to ground.

Evaporator Fan Test - Direct Current

The evaporator fan has 12 VDC power at all times. Evaporator temperature determines the fan speed. See the Technical Data section for evaporator fan rating.

  1. Verify the control board model configuration is correct.
  2. Disconnect the electrical connector from the fan.
  3. Measure the resistance between the power wire and the return wire.
  4. Reconnect the fan.
  5. Check for voltage between the power and return wires.
  6. Check for voltage between the variable speed control and return wires.

Evaporator Fan Wiring

ColorRefrigeratorFreezer
RedPowerPower
YellowVariable speed controlN/A
Yellow/brownN/AVariable speed control
BlueTachometer inputN/A
Blue/whiteN/ATachometer input
WhiteFan returnFan return

Fan DC Voltage Test Results

TestMeasure Result
Measure fan power to fan return12 VDC
Measure variable speed control to fan return12 VDC at high speed
Measure tachometer input to fan returnVariable VDC based on fan speed

TIP: Test voltage under load.

Built-In Water Isolation Valve Test Procedure

Refer to the Water Flow diagram in this manual. This procedure is for Built-In units above serial number 4380000.

On dispenser models, activating the dispenser confirms that the isolation valve is opening.

To measure the resistance of the isolation valve solenoid:

  1. Turn off the power to the unit.
  2. Disconnect the electrical leads from the isolation valve solenoid. On dual isolation valves, the solenoid is black with yellow fittings. On the single isolation valve, the solenoid is brown with yellow fittings.
  3. Measure the resistance between the isolation valve solenoid terminals. Compare the results with the Technical Data table.

Built-In Dispenser Valve Test Procedure

Refer to the Water Flow diagram in this manual. This procedure is for Built-In units above serial number 4380000.

On dispenser models, activating the dispenser confirms that the dispenser valve is opening.

To measure the resistance of the dispenser valve solenoid:

  1. Turn off the power to the unit.
  2. Disconnect the electrical leads from the dispenser valve solenoid. On dispenser models, the solenoid is tan with blue fittings.
  3. Measure the resistance between the dispenser valve solenoid terminals. Compare the results with the Technical Data table.

Built-In Ice Maker Valve Test Procedure

Refer to the Water Flow diagram in this manual. This procedure is for Built-In units above serial number 4380000.

To measure the resistance of the ice maker valve solenoid:

  1. Turn off the power to the unit.
  2. Disconnect the electrical leads from the ice maker valve solenoid. On water valves, the ice maker solenoid is purple with yellow fittings.
  3. Measure the resistance between the ice maker valve solenoid terminals. Compare the results with the Technical Data table.

Built-In Dispenser Water Valve Test Procedure

Refer to the Water Flow diagram in this manual. This procedure is for Built-In units above serial number 4380000.

On dispenser models, activating the dispenser confirms that the dispenser water valve is opening.

To measure the resistance of the dispenser water valve solenoid:

  1. Turn off the power to the unit.
  2. Disconnect the electrical leads from the dispenser water valve solenoid. On the dispenser water valve, the solenoid is blue with blue fittings.
  3. Measure the resistance between the dispenser water valve solenoid terminals. Compare the results with the Technical Data table.

Built-In Defrost Heater Test Procedure

This procedure is for Built-In units with a freezer above serial number 4380000.

Confirm the defrost heater is working by activating the defrost system in manual component activation mode, which lasts for five minutes. See the instructions in the Controls and Operation section. The defrost heater operation can be confirmed by monitoring the evaporator temperature displayed on the control panel during defrost heater activation, or by removing the freezer air duct and viewing the defrost heater.

WARNING: DISCONNECT ELECTRICAL POWER TO ANY APPLIANCE COVERED IN THIS MANUAL BEFORE SERVICING. IF ELECTRICAL POWER IS NEEDED FOR COMPONENT TESTING OR DIAGNOSTICS, DISCONNECT ELECTRICAL POWER IMMEDIATELY AFTER TESTING OR DIAGNOSTICS ARE COMPLETED. FAILURE TO DO SO COULD CAUSE SERIOUS INJURY OR DEATH!

If the defrost heater is not activating, perform the following checks to find the issue.

MeasurementProcedure
Defrost heater resistance
  1. Turn off the power to the unit.
  2. Disconnect the defrost heater wire harness from the unit wire harness.
  3. Measure the resistance between the defrost heater terminals. Compare the results with the Technical Data table.
  4. If the results are good, check the defrost terminator for continuity.
  5. If the results are bad, replace the defrost heater.
Defrost terminator resistance
  1. Run the freezer system with the door or drawer open for five minutes to verify the defrost terminator is closed.
  2. Turn the power off to the unit.
  3. Disconnect the defrost terminator from the defrost wire harness.
  4. Measure the resistance across the terminals of the defrost terminator connector.
  5. If the resistance is very large or infinite, the defrost terminator is open. Replace the defrost terminator.
  6. If the resistance is low or zero, the defrost terminator is good. Check the voltage to the defrost heater.
Defrost heater voltage
  1. Activate the defrost system in manual component activation mode. Back pin the gray/white wire on the defrost connector. In volts AC, measure the voltage from the gray/white wire to ground.
  2. If the voltage is approximately 230 VAC, the voltage to the defrost heater is good.
  3. If the voltage is good, activate the defrost system again and see if it is operating correctly. It might be necessary to cool the freezer evaporator to close the defrost terminator first.
Defrost terminator voltage
  1. If the voltage is not good, measure the voltage to the defrost terminator. Activate the defrost system in manual component activation mode. Back pin the blue wire in the defrost terminator connector. In volts AC, measure the voltage from the blue wire to ground.
  2. If the voltage is approximately 230 VAC, the voltage to the defrost terminator is good.
  3. If the voltage is good, remove the defrost terminator, and check the connections from the defrost terminator to the defrost heater.
  4. If the voltage is not good, measure the voltage from the control board. Activate the defrost system in manual component activation mode. Back pin P15-8, the blue wire, and in VAC, measure the voltage from P15-8 to ground.
  5. If the voltage is approximately 230 VAC, the voltage to the defrost terminator is good.
  6. If the voltage is good, turn off the power to the unit, and check the continuity of the blue wire from the control board to the unit harness connector, across the unit harness connector, and from the cabinet side of the unit harness to the defrost terminator connector.
  7. If the voltage is not good, turn off the power to the unit and disconnect P15-8, and measure the continuity across the connector.
  8. If the continuity across the P15-8 connector is good, replace the control board.

BI-36UFDID and BI-42UFDID Drain Trough Heater Test Procedure

This test procedure is for the BI-36UFDID and BI-42UFDID models (including ICB) above serial number 4380000.

Confirm the drain trough heater is working by activating the defrost system in manual component activation mode. See the instructions in the Controls and Operation section of the service manual. Remove the freezer air duct to confirm that the drain trough heater is operating.

To measure the resistance of the drain trough heater:

  1. Turn the power off to the unit.
  2. Disconnect the drain trough heater harness from the defrost harness.
  3. Measure the resistance between the drain trough heater terminals. Compare the results with the Technical Data table.
  4. If the results are good, check the continuity across the drain trough heater connector.
  5. If the results are bad, replace the drain trough heater.

Sealed System

Sealed System Troubleshooting

Enter the sealed system to check pressures only if the Error Code Troubleshooting Guide and General Troubleshooting Guide do not pinpoint the cause of the temperature problem.

Non-Functional, Inefficient, or Noisy Compressor

  1. Always evacuate R600a refrigerant to the outdoors.
  2. Use nitrogen for back-flushing the system.
  3. Remove the compressor.
  4. Replace the high-side filter drier.
  5. Recharge the system with virgin R600a refrigerant.

High Side Leak

  1. Always evacuate R600a refrigerant to the outdoors.
  2. Use nitrogen for back-flushing the system.
  3. Repair any leaks at the solder joint or replace the defective component.
  4. Replace the high-side filter drier.
  5. Bump or tap the compressor to help release residual refrigerant from the oil in the compressor.
  6. Recharge the system with virgin R600a refrigerant.

Low Side Leak

  1. Always evacuate R600a refrigerant to the outdoors.
  2. Use nitrogen for back-flushing the system.
  3. Repair any leaks at the solder joint or replace the defective component.
  4. If all refrigerant escapes and the system is in a vacuum, replace the compressor.
  5. Replace the high-side filter drier.
  6. Recharge the system with virgin R600a refrigerant.

Contaminated Sealed System

  1. Always evacuate R600a refrigerant to the outdoors.
  2. Use nitrogen for back-flushing the system.
  3. Repair any leaks at the solder joint, or replace the defective component.
  4. Replace the compressor.
  5. Replace the high-side filter drier.
  6. Replace the evaporator or heat exchanger assembly if the cap tube clogs.
  7. Install a low-side drier on the suction line.
  8. Recharge the system with virgin R600a refrigerant.

Sealed System Restriction

IMPORTANT NOTE: If a restriction is due to the sealed system being contaminated, see Contaminated Sealed System.

  1. Always evacuate R600a refrigerant to the outdoors.
  2. Locate and remove the restriction or locate and replace the part.
  3. Use nitrogen for back-flushing the system.
  4. Replace the high-side filter drier.
  5. Bump or tap the compressor to help release residual refrigerant from the oil in the compressor.
  6. Recharge the system with virgin R600a refrigerant.

Sealed System Refrigerant Overcharge

  1. Always evacuate R600a refrigerant to the outdoors.
  2. Use nitrogen for back-flushing the system.
  3. Replace the high-side filter drier.
  4. Bump or tap the compressor to help release residual refrigerant from the oil in the compressor.
  5. Recharge the system with virgin R600a refrigerant.
Models: ICBBI-42UFDID, ICBBI-42UFDID Built In Refrigerator, Built In Refrigerator, Refrigerator

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Intl - Service Manual - ICBBI-42UFDID-155-166

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