Troubleshooting

TROUBLESHOOTING

This section of the manual contains troubleshooting information which will help the Service Technician troubleshoot a Wolf E-Series Wall Oven. The table of contents below shows how the troubleshooting guide section of this manual is laid out.

Troubleshooting Table of Contents

Description Page #
Glossary & General Information 5-3
Diagnostic Mode 5-4
Initiating Diagnostic Mode 5-4
(Auto) Self Test 5-5
Manual Test 5-5
Non-Heating Device Test Table 5-5
Heating Device (Element) Test Table 5-6
Error History 5-6
Version Information 5-7
Statistics 5-7
Possible Error Indicators 5-8
Error Priority 5-8
Error Table 1 - External Components 5-8
Error Table 2 - Internal Components 5-9
Error Table 3 - System Components 5-10
General Troubleshooting Guide 5-10
Relay Board Multi-color Status LED 5-12
Diagnostics Flow Chart 5-13
Manual Test Flow Chart 5-14
Statistics Flow Chart 5-15
User Options Flow Chart 5-16
Resistance (Ohm) Charts - Single Oven 5-17
Resistance (Ohm) Charts - Double Oven 5-18

GLOSSARY & GENERAL INFORMATION

The following acronyms and their descriptions are relevant to the Wolf E-Series Wall Oven:

ACRONYM ALTERNATE DESCRIPTION DESCRIPTION ALTERNATE DESCRIPTION
CRC Cyclical Redundancy Check
DLB Double Line Break
DLL L2 Relay on Relay Board
EON End of Cycle
FMEA Failure Mode and Effects Analysis
HSWD HIV High Side Watch Dog
HV High Voltage Micro
HIV
LATD Lower Auxiliary Time Display
LCD Liquid Crystal Display
LIL LILA Lower Information Line Display Phrase
LV LOV Low Voltage Micro
MDL MDS Motor Door Lock
MTD Main Temperature Display
RM RMA Relay Module
RTF RTD Resistive Thermal Device
S/N Serial Number
SPI Serial Peripheral Interface
TCO Thermal Cut-out
TOD TODD Time of Day Display Idle Mode
UATD Upper Auxiliary Time Display
UIL URL Upper Information Line
UIM UM User Interface Module

The display interface includes an UPPER INFORMATION LINE and a LOWER INFORMATION LINE, along with indicators for TIMER, CLOCK, PROBE, COOK TIME, and STOP TIME.

DIAGNOSTIC MODE

Diagnostic Mode allows the Service Technician to inspect the functionality of the Oven Controller and Relay boards, as well as electrical components. It displays the last twenty errors and monitors relays, temperature, and switches.

Initiating Diagnostics Mode

To enter Diagnostic Mode, press and hold the SET TIMER key for approximately five (5) seconds while both cavities are in Idle Mode. The system will prompt to enter Diagnostics/Showroom Menu mode. The Lower Information Line will scroll options like "PRESS 1 TO ENTER DIAGNOSTICS MODE." The Upper Information Line will show the Showroom mode status (ON or OFF).

With "SHOWROOM MODE OFF" displayed, press the “1” key to initiate Diagnostic Mode. The display will show "DIAGNOSTICS" and a menu will scroll across the bottom, offering options such as:

To exit Diagnostic Mode, press the OVEN OFF key. The mode also ends five (5) minutes after the last key press.

Figure 5-1. Selecting Diagnostics Mode shows a diagram of the control panel with instructions to press and hold the SET TIMER key for 5 seconds, then press 1 for Diagnostics.

(Auto) Self Test

After entering Diagnostics, press “1” for (Auto) Self Test and then “ENTER”. The display will show "SELF TEST ACTIVE" and "TESTING... PLEASE WAIT".

NOTES:

When testing is complete, the display shows "SELF TEST RESULTS" with test results and service instructions. The CLEAR key returns to the initial Diagnostic Mode menu.

Figure 5-2 Selecting Self Test shows the control panel after entering Diagnostics Mode and selecting Self Test.

Manual Test

Manual Test uses the electronic control to force operation of electrical devices to verify their function. Additional equipment like a VOM may be needed for full verification.

After entering Diagnostics, press “2” for Manual Test. Then press the appropriate key for the desired test or press ENTER to cycle through tests. Refer to the tables for specific key presses and expected display responses.

NOTES:

Figure 5-3. Selecting Manual Test shows the control panel with instructions to press “2” to initiate Manual Test.

Non-Heating Devices Testing Table

Key Pressed Relay(s) Activated Action Display Response
Key 6 Cooling Fan Cooling Fan Cooling fan test on
Key 7 Motor Door Lock (MDL) MDL Switch in open position MDL is open
Motor Door Lock (MDL) MDL in transition MDL is in process: Up arrow illuminated
Motor Door Lock (MDL) MDL Switch in closed position MDL is closed: Up arrow illuminated
Key 8 Left Convection Fan Left Convection Fan Left Convection Fan test on
Key 9 Right Convection Fan Right Convection Fan Right Convection Fan test on
Upper/Lower Not Applicable Switch to opposite cavity
Oven Light Oven Light Light turns on Lights Test on
Timed Cook Beeper Beeper Beeper Test on
Lock None Returns to Initial Service Menu

Heating Devices (Element) Testing Table

Key Pressed Relay(s) Activated Display Response (Upper & Lower Information Lines)
Bake Inner Bake Element Inner Bake Element On Press Bake to toggle
Broil Broil Element Broil Element Press Broil to toggle
Convection Bake Outer Bake Element Outer Bake Element Press Conv. Bake to toggle
Convection Broil Right Convection Element Right Conv. Element Press Conv. Broil to toggle
Convection Left Convection Element Left Conv. Element Press Conv. to toggle

Error History

After entering Diagnostics, press “3” for Error History. The display will show "Error History". If errors are stored, it will prompt "PRESS 1 TO VIEW ERROR HISTORY, PRESS 2 TO CLEAR ERROR HISTORY". If no errors are stored, it will display "NO ERRORS STORED. PRESS CLEAR TO RETURN".

Pressing “1” shows the first logged error, and the ENTER key cycles through multiple errors. After the last error, ENTER returns to the initial prompts.

To clear error history, re-enter Error History and press “2”. The prompt "Press 1 = No, 2 = Yes" will appear. Pressing “2” clears all history.

NOTES: Error History can be exited using the LOCK, CLEAR, or OVEN OFF keys.

Figure 5-4. Selecting Error History shows the control panel with instructions to press “3” to initiate Error History.

Version Information

Version information is used for manufacturing purposes. It includes:

To view Version Information, enter Diagnostics, press “4”. The display will show "Version Info" and then cycle through the listed areas of interest by pressing ENTER.

NOTES: Version Information can be exited using the LOCK, CLEAR, or OVEN OFF keys.

Statistics

To observe Statistical Information, enter Diagnostics, then press “5”. The display will show "Statistics" and prompt "Press ENTER for Stats". Toggling through statistics is done by pressing ENTER.

For double ovens, the UPPER/LOWER key switches between ovens. Pressing SET TIMER allows viewing the last 5 functions.

If statistical data is corrupted or missing, "NO MODE" will be displayed, and all data items will be 0.

NOTES: Statistics can be exited using the LOCK, CLEAR, or OVEN OFF keys.

Possible Error Indicator Displays

The tables below list error phrases that may appear on the LCD. The left column indicates priority (not displayed), the middle column shows the error phrase, and the right column explains the failed part or action.

Error Priority

There are three priority levels:

ERROR TABLE #1 - EXTERNAL COMPONENTS

Priority Displayed Phrase Service Instruction
2 RTD Open (Upper/Lower) RTD failure (device or wiring)
2 RTD Shorted (Upper/Lower) Meat Probe failure (device or wiring)
2 Temp Probe Short
3 No Inner Bake element detect Check specified element & wiring
3 No Outer Bake element detect
3 No Broil element detect
3 No Lt Conv element detect
3 No Rt Cony element detect
3 No MDL detect Check specified MDL & wiring
3 No Left Convect Fan detect Check specified fan & wiring
3 No Rt Convect Fan detect
3 No Cooling Fan detect
3 No Oven Light detect Check specified oven light transformer & wiring
2 Lock inputs invalid Check door motor assy & wiring
2 Lock/Door inputs invalid for Clean
2 MDL run timeout
2 TCO detect as open Check air flow, verify cooling fan operational
2 Brownout error Check home wiring, voltages, replace Relay Module
2 Inner Bake relay shorted Check connections, replace Relay Module of the oven indicated

ERROR TABLE #2 - INTERNAL COMPONENTS

Priority Displayed Phrase Service Instruction
2 Outer Bake relay shorted
2 Broil relay shorted
2 Left Convect relay shorted
2 Right Convect relay shorted
2 MDL relay shorted
3 Left Convect Fan triac shorted
3 Right Convect Fan triac shorted
3 Cooling Fan triac shorted
3 Oven Light relay shorted
2 DLB1 shorted
2 DLB2 shorted
3 Aux DLB shorted
3 Inner Bake relay open
3 Outer Bake relay open
3 Broil relay open
3 Left Convect relay open
3 Right Convect relay open
3 MDL relay open
3 Left Convect Fan triac open
3 Right Convect Fan triac open
2 Cooling Fan triac open
3 Oven Light relay open
2 DLB1 relay or TCO open
2 DLB2 relay open
2 Aux DLB open
2 RTD Circuitry error
3 RM EE checksum error
3 HIV SPI com err detected by RM control
3 HIV SPI com err detected by HV-micro
3 HIV micro feedback error
1 RM LOV fuse error
3 RM HIV fuse error
2 HSWD active, should be inactive
2 HSWD inactive, should be active
3 RM Ambient Thermistor open error
3 RM Ambient Thermistor shorted error
3 RM Line Voltage A/D error
2 MDL circuitry error
2 RM FMEA circuitry error
1 Keypad circuit error Check keypad & connections
1 Keypad comm error detected by the UIM
1 Keypad comm error detected by the Keypad
1 Keypad FMEA error
1 Keypad EE CRC error
3 Keypad mains sync error

ERROR TABLE #3 - SYSTEM COMPONENTS

Priority Displayed Phrase Service Instruction
3 UIM EE checksum error Replace UIM Module
1 UIM configuration data CRC error
1 UIM fuse error
3 UIM ambient thermistor open error
3 UIM ambient thermistor shorted error
1 LCD module error
2 Communications error detected by the UIM Check com harness, replace Relay Module
2 Communications error detected by the RM Check com harness, replace UIM Module
2 Overtemp error - door unlocked Check door motor assy & wiring, replace Relay Module
2 Overtemp error - door locked Replace Relay Module
2 RM Ambient overtemp error Check air flow, verify cooling fan operational, replace relay module
2 UIM Ambient overtemp error Check air flow, verify cooling fan operational, replace UIM.
3 Self-clean rate-of rise error Check oven for leaks, insulation problems. Run diagnostics, look for open outputs or loads

General Troubleshooting Guide

Problems Associated with the Control Panel

Problems Associated with Temperature

Problems Associated with the Door Lock

Problems Associated with the Cooling Fan

Problems Associated with the Convection Fan

Problems Associated with the Oven Light

Problems Associated with the Beeping

PROBLEM POSSIBLE CAUSE TEST / ACTION
A. OVEN DISPLAY NOT WORKING No power, circuit breaker tripped Reset circuit breaker. May have to call an electrician
Loose or defective wire connection(s) Repair or replace wiring
Defective relay board Perform testing procedure located at end of section 5
Defective control board Perform testing procedure located at end of section 5
Defective head assembly Perform testing procedure located at end of section 5
B. UNRESPONSIVE KEY PAD(S) Key panel in locked mode Press and hold lock key for three seconds to unlock
Oven in sabbath mode Press Off key to exit sabbath mode
Loose connection to flat flex cable from control panel assy. to oven control board. Check cable connections. Unplug and reseat. Test key again, still not working replace head assembly
Small Black two pin connector from power board to relay board not connected.
C. LONG PREHEAT (In all modes except broil) Defective element Check for error codes in diagnostic mode. Perform element testing procedure. Replace if defective
D. NO HEAT (In all modes) Defective Door Switch Replace Door Switch
Loose or defective wire connection(s) Repair or replace wiring
Shorted or open element Check for error codes in diagnostic mode. Perform element testing procedure. Replace if defective
Defective relay board Check for error codes in diagnostic mode. Perform testing procedure located at end of section 5
TCO tripped or open Check temperature reading of TCO, should be 350°F. If not, replace limit with correct part. Reset
E. OVEN TEMPERATURE TOO HIGH OR TOO LOW Customer using wrong temperature Refer to Use/Care Guide for operation
User Preference Offset mis-calibrated Check UPO setting. Refer to instructions on page 3-3. Before making any temperature changes to UPO, check oven temperature with thermometer. UPO setting can be ±35°F.
F. TEMPERATURE PROBE NOT WORKING Defective RTD Sensor Check ohms of RTD Sensor according to technical data. Replace if out of specification
Wrong cooking mode for probe Refer to Use/Care Guide for operation
Probe not inserted all the way into the receptacle Check for error codes in diagnostic mode. Insert probe into receptacle first before initiating diagnostic mode
G. DOOR WILL NOT LOCK IN SELF-CLEAN MODE Loose or defective wiring Check for error codes in diagnostic mode. Perform testing procedure. Repair or replace wiring. Align door as needed for proper closure.
Door Alignment
H. COOLING FAN DOES NOT WORK Defective MDL (Motor Door Lock) Ohm switches and motor. Replace if defective
Loose or defective wiring Repair or replace wiring
No power to cooling fan Check for power from J3 on relay board while using diagnostic mode to toggle between speeds. Low speed, J3 - Pin 3 to Neutral (E3); High speed, J3 - Pin 1 to Neutral (E3). 120VAC ± 10% should be present. If not, replace relay board.
I. COOLING FAN NOISY Air diverter bracket loose Tighten air diverter bracket screws or replace rivets
Defective cooling fan motor Check for error codes in diagnostic mode. Perform testing procedure. Ohm motor, replace if out of specifications according to technical data.
J. CONVECTION FAN DOES NOT WORK Defective Door Switch Replace Door Switch
Loose or defective wire connection Repair or replace wiring
Defective convection motor Check for error codes in diagnostic mode. Perform testing procedure. Replace convection fan assembly
K. NOISY CONVECTION FAN Fan blade out of balance Replace convection motor assembly
Loose fan blade Tighten nut for fan blade
Loose mounting Tighten screws for mounting
L. CONVECTION FAN DOES NOT SHUT OFF WHEN DOOR OPEN Defective door switch Check continuity of door switch. Replace if defective
M. OVEN LIGHT DOES NOT WORK Defective bulb (if only one bulb out) Replace bulb
Loose or defective wiring Repair or replace wiring
Defective fuse (if both bulbs out) Replace fuse
Defective door switch (if both bulbs out) Check continuity of door switch. Replace if defective
Defective key pad (if both bulbs out) Replace control panel assembly
Defective transformer (if both bulbs out) Replace transformer
N. RANDOM BEEPING Defective relay board Replace relay board
Noisy Input Power Check grounding wire. Install if missing
Display Case Plastic Bushing If plastic bushing is there, remove it
Low Input Power Replace relay board.

Relay Board Multi-Color Status LED

There is a status LED on the Relay Board that will indicate unit status to a field technician. If the access cover over the Relay Board is removed when the unit goes into self test (either during power-up or when selecting Self Test) this indicator will show the following unit condition:

Flow Charts

DIAGNOSTICS FLOW CHART

This flowchart illustrates the process for entering and navigating the Diagnostic/Showroom Mode, including Auto Self Test, Manual Test, Error History, Version Info, and Statistics. Key presses like ENTER, CLEAR, and LOCK have specific functions within the mode.

MANUAL TEST FLOW CHART

This flowchart details the steps for performing various manual tests on the oven components. It outlines the entry into Manual Test, the selection of specific tests (e.g., Beeper Test, Broil Element Test, Cooling Fan Test), and the expected display responses and key presses for each test.

STATISTICS FLOW CHART

This flowchart maps out the process for accessing and viewing unit statistics. It covers unit operation time, last 5 functions, and various operational metrics like preheat duration, overshoot, and call-for-heat cycles for different cooking modes.

USER OPTIONS FLOW CHART

This flowchart guides the user through the User Option Mode, which allows customization of settings such as Language Selection, Temperature Display Preference, User Preference Offset, Clock Display Preference, Backlight Brightness, LCD Contrast, and Beeper Tone Selection.

Ohm Test SO Components

WARNING: TO AVOID ELECTRICAL SHOCK, POWER TO THE UNIT MUST BE DISCONNECTED BEFORE ATTEMPTING THE FOLLOWING TESTS.

This table lists various components and their expected resistance (Ω) values, along with test points A and B for ohm testing. It is important to test the resistance of heating elements only when they are disconnected from the board.

Component Resistance Ω Test Point A Test Point B
Temperature Sensor RTD 1091 @ 75°F P2-10 P2-8
Element, Convection Right 23 to 26.6 P13-3 P12-6
Element, Convection Left 23 to 26.6 P13-3 P12-1
Fan, Convection Right approx. 50 P6-7 P6-5
Fan, Convection Left approx. 50 P6-7 P6-4
Element, Bake Outer 31 to 39 P11-4 P10-4
Element, Bake Inner 29 to 35 P11-4 P10-1
Cooling Fan approx. 36 P6-7 P6-6
Element, Broil 30 15.3 to 18.5 P11-4 P11-1
Motorized Latch Motor 12K P6-7 P6-3
Motor Door Lock-LSW 0Ω only when door lock is locked P2-2 P2-1
Motor Door Lock-UNLSW 0Ω only when door lock is unlocked P2-2 P2-3
Door Shut Switch -DRSW 0Ω only when door is shut P2-4 P2-5
Lighting Transformer approx. 50 P6-7 P6-2
Meat Probe If inserted verify 34,000 @ 90°F P2-5 P2-7

NOTE: Test the resistance of heating elements on the plugs only when they are disconnected from the board.

A diagram of the Relay Module with test points is provided.

Ohm Test DO Components

This table lists components for the double oven (DO) and their expected resistance (Ω) values, along with test points A and B.

Component Resistance Ω Test Point A Test Point B
Temperature Sensor RTD - Upper 1091@ 75°F P2-10 P2-8
Temperature Sensor RTD Lower 1091 @ 75°F P3-10 P3-8
Element, Convection Right 23 to 26.6 P13-3 P12-6
Element, Convection Left 23 to 26.6 P13-3 P12-1
Fan, Convection Right approx. 50 P6-7 P6-5
Fan, Convection Left approx. 50 P6-7 P6-4
Element, Bake Outer Upper 31 to 39 P11-4 P10-4
Element, Bake Inner Upper 29 to 35 P11-4 P10-1
Element, Bake Outer Lower 31 to 39 P15-4 P14-4
Element, Bake Inner Lower 29 to 35 P15-4 P14-1
Upper Cooling Fan approx. 36 P6-7 P6-6
Lower Cooling Fan approx. 25 P6-7 P7-1
Element, Broil 30 Upper 15.3 to 18.5 P11-4 P11-1
Element, Broil 30 Lower * 15.3 to 18.5 P15-4 P15-1
Motorized Latch Motor Upper 12K P6-7 P6-3
Motor Door Lock-LSW (Upper) 0Ω only when door lock is locked P2-2 P2-1
Motor Door Lock-UNLSW (Upper) 0Ω only when door lock is unlocked P2-2 P2-3
Door Shut Switch -DRSW (Upper) 0Ω only when door is shut P2-4 P2-5
Motorized Latch Motor Lower 12K P3-2 P3-1
Motor Door Lock-LSW (Lower) 0Ω only when door lock is locked P3-2 P3-3
Motor Door Lock-UNLSW (Lower) 0Ω only when door lock is unlocked P3-2 P3-4
Door Shut Switch -DRSW (Lower) 0Ω only when door is shut P3-4 P3-6
Lighting Transformer (Upper) approx. 50 P6-7 P6-2
Lighting Transformer (Lower) approx. 50 P6-7 P7-5
Meat Probe If inserted verify 34,000 @ 90°F P2-5 P2-7

A diagram illustrating the connections for various components to the Relay Module is provided.

Models: E-Series, E-Series Wall Oven, Wall Oven, Oven

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Service Manual - Legacy E Series Wall Oven-64-80 iTextSharp™ 5.5.5 ©2000-2014 iText Group NV (AGPL-version); modified using iTextSharp™ 5.5.5 ©2000-2014 iText Group NV (AGPL-version)

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