White Rodgers Blue Single 1/1 Stage Thermostat with Automatic Heat/Cool Changeover Option
Single Stage or Heat Pump
Installation and Operating Instructions for Model:
| Model | Programming Choices |
| 1F80-0471 | 5/2 Day, 5/1/1 Day, Non-Programmable |
| 1F86-0471 | Non-Programmable |
Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
APPLICATIONS
THERMOSTAT APPLICATION GUIDE
| Description | |
| Gas or Oil Heat | Yes |
| Electric Furnace | Yes |
| Heat Pump (No Aux. or Emergency Heat) | Yes |
| Heat Pump (with Aux. or Emergency Heat) | No |
| Systems with up to 3 Stages Heat, 2 Stages Cool | No |
| Heat Only Systems | Yes |
| Millivolt Heat Only Systems – Floor or Wall Furnaces | Yes |
| Cool Only Systems | Yes |
| Hydronic (Hot Water) Zone Heat – 2 Wires | Yes |
| Hydronic (Hot Water) Zone Heat – 3 Wires | Yes |
SPECIFICATIONS
Electrical Rating:
- Battery Power: mV to 30 VAC, NEC Class II, 50/60 Hz or DC
- Input-Hardwire: 20 to 30 VAC
- Terminal Load: 1.0 A per terminal, 1.5A maximum all terminals combined
- Setpoint Range: 45° to 90°F (7° to 32°C)
- Differential (Single Stage): Heat 0.6°F; Cool 1.2°F (adjustable)
- Differential (Heat Pump): Heat 1.2°F; Cool 1.2°F (adjustable)
- Operating Ambient: 32° to +105°F (0° to +41°C)
- Operating Humidity: 90% non-condensing max.
- Shipping Temperature Range: -4° to +150°F (-20° to +65°C)
- Dimensions Thermostat: 3.4"H x 4.4"W x 1.3"D
To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.
ATTENTION: MERCURY NOTICE
This product does not contain mercury. However, this product may replace a product that contains mercury.
Mercury and products containing mercury must not be discarded in household trash. Do not touch any spilled mercury. Wearing non-absorbent gloves, clean up any spilled mercury and place in a sealed container. For proper disposal of a product containing mercury or a sealed container of spilled mercury, place it in a suitable shipping container. Refer to www.white-rodgers.com for location to send product containing mercury.
Index
- Installation: 2
- Wiring Connections: 2
- Thermostat Quick Reference: 3
- Installer Configuration Menu: 4
- Operating Your Thermostat: 6
- Programming: 6
- Troubleshooting: 8
INSTALLATION
Thermostat installation and all components of the control system shall conform to Class II circuits per the NEC code.
Remove Old Thermostat
A standard heat/cool thermostat consists of three basic parts:
- The cover, which may be either a snap-on or hinge type.
- The base, which is removed by loosening all captive screws.
- The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adapter plate. Before removing wires from old thermostat, label each wire with the terminal designation from which it was attached. Disconnect the wires from the old thermostat one at a time. Do not let wires fall back into the wall.
Installing New Thermostat
- Pull the thermostat body off the thermostat base. Forcing or prying on the thermostat will cause damage to the unit.
- Place base over hole in wall and mark mounting hole locations on wall using base as a template.
- Move base out of the way. Drill mounting holes. If you are using existing mounting holes and the holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure the base.
- Fasten base snugly to wall using mounting holes shown in Figure 2 and two mounting screws. Leveling is for appearance only and will not affect thermostat operation.
- Connect wires to terminal block on base.
- Push excess wire into wall and plug hole with a fire resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
- Carefully line the thermostat up with the base and snap into place.
SS/HP Switch (Conventional or Heat Pump Selection)
The SS/HP switch is factory set to the SS position. In this position, thermostat is configured as conventional single stage. If you have a single stage heat pump system, switch SS/HP to HP position (see figure 2).
Gas/Elec Switch (Fan Option)
The GAS/ELEC switch is factory set to the GAS position. In this position, the thermostat will not power the circulator fan on a call for heat, but will power the circulator on a call for cool. If your system requires that the thermostat power the circulator fan on a call for heat, this switch should be set to the ELEC position. Typically, gas and oil heating systems do not require the thermostat to power the circulator fan during a call for heat. If your heat is gas or oil, the switch should be set to the GAS position. When the thermostat is configured for Heat Pump, the thermostat will always power the circulator fan on a call for heat in the HEAT mode.
Batteries
2 "AA" alkaline batteries are included in the thermostat. To install the batteries, pull the battery door as shown by the arrow and lift open. Using the polarity indicated inside the battery door, insert the batteries. To close the battery door, swing the door down while pulling in the direction of arrow. Once fully down, snap the door back into position. To replace the batteries, set system to OFF, following the instructions above.
Figure 1 - Battery door shown open
A digital thermostat display showing "12:00" and "70°", with SYSTEM, FAN, and MENU buttons below. The battery compartment door is shown open, revealing space for two "AA" Alkaline Batteries.
Thermostat can be powered by system AC power or Battery. If ? is displayed, the thermostat is battery powered. If ⚡ is not displayed, thermostat is system powered with optional battery back-up. When battery power remaining is approximately half, the ? will be displayed. When "Change ?" is displayed, install fresh "AA" alkaline batteries immediately. For best results, replace all batteries with a premium brand alkaline battery such as Duracell® or Energizer®. We recommend replacing batteries every 2 years. If the home is going to be unoccupied for an extended period (over 3 months) and ? is displayed, the batteries should be replaced before leaving. When less than two months of battery life remain, the setpoint temperature will offset by 10 degrees (10 degrees cooler in Heat mode / 10 degrees warmer in Cool mode). If offset occurs, the normal setpoint can be manually reset with ⬆️ or ⬇️. Another offset will occur within two days if batteries are not replaced.
Figure 2 - Thermostat base and rear view of thermostat
A diagram showing the thermostat base with mounting holes and terminal designations. It also shows the SS/HP switch and the GAS/ELEC switch.
WIRING CONNECTIONS
Refer to equipment manufacturers' instructions for specific system wiring information. After wiring, see CONFIGURATION section for proper thermostat configuration. Refer to 37-6754 for 1F80-0471 wiring diagram specifications.
TERMINAL DESIGNATION DESCRIPTIONS
| Terminal Designation | Description | Terminal Designation | Description |
| O/B | (SS) Power closed for 3 wire zone (HP) Changeover valve for heat pump | RH | Power for Heating |
| Y | Compressor Relay | RC | Power for Cooling |
| W | Heat Relay | C | Common wire from secondary side of cooling system transformer or heat only system transformer |
| G | Fan Relay |
THERMOSTAT QUICK REFERENCE
Home Screen Description
Figure 4 - Home Screen Display
A diagram of the thermostat's home screen. It shows the current Time (e.g., 12:00), Day of Week (e.g., Mo), Room Temperature (e.g., 70°), and Setting Temperature (e.g., 70°). Indicators for SYSTEM (Heat, Cool, Auto, Off) and FAN (Auto, On) are visible. Buttons labeled SYSTEM, FAN, MENU/SCHEDULE/RUN, and HOLD are shown below the display.
Displays the power level of the 2 "AA" batteries:
- ? indicates good power level.
- ? indicates batteries at about half power.
- "Change ?" indicates batteries are low and should be replaced with 2 new premium brand "AA" Alkaline batteries.
Figure 5 - Programming & Configuration Items
A diagram illustrating the thermostat's programming and configuration interface. It shows numbered elements corresponding to display indicators and buttons.
Programming and Configuration Items
- Flame icon (?) is displayed when the system is in HEAT mode. Snowflake icon (❄️) is displayed when the system is in COOL mode.
- The word "Hold" is displayed when the thermostat is in the HOLD mode. "Temp Hold" is displayed when the thermostat is in a Temporary HOLD mode.
- Displays "Change Filter" when the system has run for the programmed filter time period as a reminder to change or clean your filter.
- Displays "Set" for setpoint when in Run Program mode.
- Displays System Mode (Heat, Cool, Auto, Off) or "Time" in menu mode.
- Displays Fan Mode (On, Auto) or "Run" in Menu mode or "Saving" in Cool Savings™ Mode.
- Displays "Run Schedule", "Schedule", or "Menu".
- Displays "Save" when Cool Savings™ is working.
- Displays "Heat Pump" when system is configured as Heat Pump thermostat.
- Displays "Hold" in programmable mode when in "Hold" mode. Displays Light Bulb in non-programmable mode.
INSTALLER/CONFIGURATION MENU
With thermostat in Heat, Cool or Auto, in normal operation, press the Menu button for at least 5 seconds. The display will show item #1 in the table below. Press Menu to advance to the next menu item. Press ⬆️ or ⬇️ to change an item option. Shaded items are not available on 1F86.
INSTALLER/CONFIGURATION MENU
| REF. | MENU | PRESS HP SS BUTTON (FACTORY DEFAULT) | DISPLAYED OPTIONS | Press ⬆️ or ⬇️ to select | COMMENTS | |
| 1 | 1 | MENU | On (Cool O) | Heat b On | Reversing Valve Output (SS/HP switch must be in the Heat Pump HP position) | |
| 2 | 2 | 1 | MENU | P (2) | P3, P0 | Selectable Programs Per Week (For programmable thermostat only) |
| 3 | 3 | 2 | MENU | Cool Saving CS (OFF) | Cool Saving CS On | Select Cool Savings on or off |
| MENU | CS (3) | 6, 5, 4, 2, 1 | Selects Cool Savings value 1 (low) to 6 (high) | |||
| 4 | 4 | 3 | MENU | E (On) | E OFF | Selects Energy Management Recovery (EMR) on or off |
| 5 | 4 | MENU | CR Heat (ME) | FA, SL | Adjustable Anticipation (Heat) (only when SS/HP switch is at the SS position) | |
| 6 | 5 | MENU | CR Cool (FA) | SL | Adjustable Anticipation (Cool) (only when SS/HP switch is at the SS position) | |
| 7 | 5 | MENU | CR Heat Pump (FA) | SL | Adjustable Anticipation (Heat Pump) (only when SS/HP switch is at the HP position) | |
| 8 | 6 | 6 | MENU | CL (OFF) | CL On | Compressor Lockout Time |
| 9 | 7 | 7 | MENU | Auto Heat Cool Off | Heat Cool Off, Heat Off with Fan icon, Heat Off without Fan icon, Cool Off, Auto Off | System Mode Configuration with Automatic Changeover |
| 10 | 8 | 8 | MENU | L (On) | L OFF | Selects Display Light on or off |
| 11 | 9 | 9 | MENU | 0 HI | 1 HI, 2 HI, 3HI, 4 HI, 1 LO, 2 LO, 3 LO, 4 LO | Adjustable Ambient Temperature Display |
| 12 | 10 | 10 | MENU | F | C | Selects Fahrenheit/Celsius Temperature Display |
| 13 | 11 | 11 | MENU | Change Filter (OFF) | Change Filter On | Selects Filter Change-out Indicator |
| MENU | Change Filter 200 h | 25 h to 1975 h in 25-hour increment | When on, selects time in 25 hour increments | |||
| 14 | 12 | 12 | RUN | Returns to Normal Operation |
1) Select Reversing Valve Output (SS/HP switch must be set at HP, omitted if SS/HP switch is SS Position) – The O/B option is factory set at "O" position. This will accommodate the majority of heat pump applications, which require the changeover relay to be energized in COOL. If the thermostat you are replacing or the heat pump being installed with this thermostat requires a "B" terminal, to energize the changeover relay in HEAT, the O/B option should be set at "B" position.
2) Program Options 1F80 only – This control can be configured for 5/2 day or 5/1/1 day programming or non-programming mode. The default setting is P2, indicating 5/2 day programming. The programs per week can be toggled to P3 or P0 by pressing the ⬆️ or ⬇️ keys. A selection of 0 Days for non-programmable will eliminate the need for EMR, and that step in the menu will be skipped.
3) Select Cool Savings™ and value – Selects the Cool Savings feature On or OFF. If selected On, press MENU to select the amount of adjustment for the feature in Cool mode with 1 (1°) being the least amount of adjustment and 6 (6°) being the most amount of adjustment. Default value is 3 (3°). In normal operation "Saving" will appear under "Fan".
Cool Savings is an optional energy saving feature that can reduce your cooling costs. It is based on the principal that lower indoor humidity makes a slightly higher temperature feel more comfortable. Cool Savings operates during periods of high demand which normally occur on the hottest summer days when the cooling system may run for hours to reach the thermostat setting. Long cooling run times also lower the indoor humidity. Cool Savings very slowly adjusts the setpoint temperature to make the setpoint closer to the displayed temperature, to a maximum number of degrees selected. Adjusting the setpoint temperature over a long cooling run time allows the system to reach your set temperature and turn off. The room temperature will actually be higher than the thermostat displays, but the reduction in humidity will allow comfort at the slightly higher temperature. When Cool Savings is making adjustments, "Save" will show next to the setpoint temperature and the room temperature may vary within the adjustment range selected. If this feature is selected OFF, no change will occur when the cooling system is continually running during periods of high demand.
4) Energy Management Recovery: (this step is skipped if configured to be non-programmable). Energy Management Recovery (E) On enables the thermostat to start heating or cooling early to make the building temperature reach the program setpoint at the time you specify. Heating will start 5 minutes early for every 1° of temperature required to reach setpoint.
Example: If E On is selected and have your heating programmed to 65° at night and 70° at 7 AM. If the building temperature is 65°, the difference between 65° and 70° is 5°. Allowing 5 minutes per degree, the thermostat setpoint will change to 70° at 6:35 AM. Cooling allows more time per degree, because it takes longer to reach set temperature.
5, 6 & 7) Cycle Rate Selection – The factory default settings with SS/HP switch in SS position for Heat is medium cycle (ME) and Cool is fast cycle (FA). For Heat Pump (HP), the default setting is fast cycle (FA).
To change cycle rate, press the ⬆️ or ⬇️ key.
Cycle rate differentials for different settings are:
| MODE | Fast | Medium | Slow |
| Heat (SS) | 0.4°F | 0.6°F | 1.8°F |
| Cool (SS) | 1.2°F | – | 1.7°F |
| Heat Pump (HP) | 1.2°F | – | 1.7°F |
8) Select Compressor Lockout CL OFF or ON – Selecting CL ON will cause the thermostat to wait 5 minutes between cooling cycles. This is intended to help protect the compressor from short cycling. Some newer compressors already have a time delay built in and do not require this feature. Your compressor manufacturer can tell you if the lockout feature is already present in their system. When the thermostat compressor time delay occurs, it will flash the setpoint for up to five minutes.
9) System Mode Configuration – This thermostat is configured for Heat and Cool with Auto changeover (SYSTEM switch with Cool Off Heat Auto) default. It can also be configured for Heat and Cool (Cool Off Heat), Heat only with fan (Off Heat), Heat only without fan, Auto only (Auto Off), and Cool only (Cool Off).
10)Select Backlight Display – The display backlight improves display contrast in low lighting conditions. When the "C" terminal is powered, selecting backlight CdL ON will keep the light on continuously. Select backlight OFF will keep the light on momentarily after any key is pressed. When the "C" terminal is not powered, the light will be on momentarily after any key is pressed no matter whether the backlight is selected ON or OFF.
11) Select Temperature Display Adjustment 4 LO to 4 HI. Allows you to adjust the room temperature display up to 4° higher or lower. Your thermostat was accurately calibrated at the factory, but you have the option to change the display temperature to match your previous thermostat. The current or adjusted room temperature will be displayed on the left side of the display.
12)Select F° or C° Readout – Changes the display readout to Centigrade or Fahrenheit as required.
13)Select Filter Replacement Reminder and Set Run Time. Select the "Change Filter" reminder On or OFF. If selected On, press MENU to select the time period from 25 to 1975 hours in 25 hours increments. In a typical system, 200 hours (default) of run time is approximately 30 days. After the selected time of blower operation, the thermostat will display "Change Filter" as a reminder to change or clean your air filter. When "Change Filter" is displayed, press MENU button to clear the display and restart the time to the next filter change.
OPERATING YOUR THERMOSTAT
Choose the Fan Setting (Auto or On)
Set the FAN Switch to Auto or On. Fan Auto is the most commonly selected setting and runs the fan only when the heating or cooling system is on. Fan On runs the fan continuously for increased air circulation or to allow additional air cleaning.
Choose the System Setting (Heat, Off, Cool, Auto)
Press the SYSTEM button to select:
- Heat: Thermostat controls only the heating system.
- Off: Heating and Cooling systems are off.
- Cool: Thermostat controls only the cooling system.
- Auto: Auto Changeover is used in areas where both heating and cooling may be required on the same day. AUTO allows the thermostat to automatically select heating or cooling depending on the indoor temperature and the selected heat and cool temperatures. When using AUTO, be sure to set the Cooling temperatures more than 1° Fahrenheit higher than the heating temperature.
Manual Operation for Non-Programmable Thermostats Mode
Press the SYSTEM button to select Heat or Cool and use the ⬆️ or ⬇️ buttons to adjust the temperature to your desired setting. After selecting your desired settings you can also press the SYSTEM button to select AUTO to allow the thermostat to automatically change between Heat and Cool.
Manual Operation (Bypassing the Program) Programmable Thermostats
Press ⬆️ or ⬇️ and the HOLD button and adjust the temperature wherever you like. This will override the program. The HOLD feature bypasses the program and allows you to adjust the temperature manually, as needed. Whatever temperature you set in HOLD will be maintained 24 hours a day, until you manually change the temperature or press Run Schedule to cancel HOLD and resume the programmed schedule.
Program Override (Temporary Override)
Press ⬆️ or ⬇️ buttons to adjust the temperature. This will override the temperature setting until the next programmed time. To cancel the temporary setting at any time and return to the program, press Run Schedule. If the SYSTEM button is pressed to select AUTO the thermostat will change to Heat or Cool, whichever ran last. If it switches to heat but you want cool, or it changes to cool but you want heat, press both ⬆️ and ⬇️ buttons simultaneously to change to the other mode.
PROGRAMMING (For Programmable Model Only)
Set Current Time and Day
- Press Menu and then Time button once. The display will show the hour only.
- Press and hold either the ⬆️ or ⬇️ button until you reach the correct hour and AM/PM designation (AM begins at midnight, PM begins at noon).
- Press Time once again. The display window will show the minutes only.
- Press and hold either the ⬆️ or ⬇️ button until you reach the correct minutes.
- Press Time once again. The display will show the day of the week.
- Press the ⬆️ or ⬇️ button until you reach the current day of the week.
- Press Run to exit the Time mode.
Enter the Heating Program
- Press SYSTEM button to select "Heat" in the system switch area indicating the active mode being programmed.
- Press the Menu button and then press Schedule.
- The top of the display will show the day(s) being programmed. The time and temperature (flashing) are also displayed. "1" will also be displayed to indicate the period.
- Press ⬆️ or ⬇️ button to change the temperature to your selected temperature for the 1st heating period.
- Press Time button, time will flash.
- Press ⬆️ or ⬇️ button to adjust the start time for the 1st period.
- The time will change in 15 minute increments.
- After you have set the time and the temperature for the period to begin, press Schedule to advance to the next program period.
- Repeat steps 2 through 8 until all of the program times and temperatures are set for all program periods on that day.
- Press Schedule to the next day and repeat steps 2 through 9.
- When programming is complete and all of the times and temperatures match your desired heating schedule, press Run Schedule. The thermostat will now run your program.
Enter the Cooling Program
- Press SYSTEM button to select "Cool" in the system switch area indicating the active mode being programmed.
- Follow Enter Heating Program instructions for entering cooling times and temperatures.
Energy Saving Factory Pre-Program
The 1F80-0471 thermostats are programmed with the energy saving settings shown in the table below for all days of the week. If this program suits your needs, simply set the thermostat clock and press the RUN button. The table below shows the factory set heating and cooling schedule for all days of the week.
| Wake Up (Period 1) | Leave For Work (Period 2) | Return Home (Period 3) | Go To Bed (Period 4) | |
| Heating Program | 6:00 AM 70°F | 8:00 AM 62°F | 5:00 PM 70°F | 10:00 PM 62°F |
| Cooling Program | 6:00 AM 75°F | 8:00 AM 83°F | 5:00 PM 75°F | 10:00 PM 78°F |
Planning Your Program – Important
The Heating and Cooling Program schedules below allow you to pencil in your own program times and temperatures. The 1F80-0471 comes configured for 5/2 day programming and can also be configured for 5+1+1 programming (see configuration section). Factory settings are listed on Monday through Friday, Saturday and Sunday. If you are re-programming a 5/2 day schedule, pencil in your own times and temperatures directly below the factory times and temperatures. If you are re-programming a 5+1+1 fill in all lines with the times and temperatures you want.
Keep the following guidelines in mind when planning your program.
- In Heating, lower temperatures will save energy.
- In Cooling, higher temperatures will save energy.
- If you plan on using Auto Changeover, do not program the heating higher than the cooling.
Worksheet for Re-Programming 5/2 Day and 5+1+1 Day Program
| Wake Up (Period 1) | Leave For Work (Period 2) | Return Home (Period 3) | Go To Bed (Period 4) | |
| Heating Program | ||||
| Mo-Fr | 6:00 AM 70°F | 8:00 AM 62°F | 5:00 PM 70°F | 10:00 PM 62°F |
| Sat-Sun or Sat | 6:00 AM 70°F | 8:00 AM 62°F | 5:00 PM 70°F | 10:00 PM 62°F |
| Sun 5+1+1 only | 6:00 AM 70°F | 8:00 AM 62°F | 5:00 PM 70°F | 10:00 PM 62°F |
| Cooling Program | ||||
| Mo-Fr | 6:00 AM 75°F | 8:00 AM 83°F | 5:00 PM 75°F | 10:00 PM 78°F |
| Sat-Sun or Sat | 6:00 AM 75°F | 8:00 AM 83°F | 5:00 PM 75°F | 10:00 PM 78°F |
| Sun 5+1+1 only | 6:00 AM 75°F | 8:00 AM 83°F | 5:00 PM 75°F | 10:00 PM 78°F |
TROUBLESHOOTING
Reset Operation
Note: When thermostat is reset, installer configuration menu settings and programming will reset to factory settings.
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermostat by removing the wires from terminals R and C (do not short them together) and removing batteries for 2 minutes. After resetting the thermostat, replace the wires and batteries. If the thermostat has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.
Note: Be sure to review the installer configuration menu settings.
To reset the programming, clock and configuration settings, press ⬆️, ⬇️ and the FAN button simultaneously. The thermostat should go blank and then all segments will be displayed momentarily.
Symptom
Possible Cause
Corrective Action
| Symptom | Possible Cause | Corrective Action |
| No Heat/No Cool/No Fan (common problems) | 1. Blown fuse or tripped circuit breaker. 2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel loose or not properly installed. 4. Loose connection to thermostat or system. | Replace fuse or reset breaker. Turn switch to ON. Replace door panel in proper position to engage safety interlock or door switch. Tighten connections. |
| No Heat | 1. Pilot light not lit. 2. Furnace Lock-Out Condition. Heat may also be intermittent. 3. Heating system requires service or thermostat requires replacement. | Re-light pilot. Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local HVAC service person for assistance. Diagnostic: Set SYSTEM Switch to HEAT and raise the setpoint above room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed above. If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a HVAC service person to verify the heating is operating correctly. |
| No Cool | 1. Cooling system requires service or thermostat requires replacement. | Same as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling. |
| Heat, Cool or Fan Runs Constantly | 1. Possible short in wiring. 2. Possible short in thermostat. 3. Possible short in heat/cool/fan system. 4. FAN Switch set to Fan ON. | Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal block. Try resetting the thermostat as described above. If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat. |
| Thermostat Setting & Thermostat Thermometer Disagree | 1. Thermostat thermometer setting requires adjustment. | The thermometer can be adjusted +/- 4 degrees. See Temperature Display Adjustment in the Configuration Menu section. |
| Furnace (Air Conditioner) Cycles Too Fast or Too Slow (narrow or wide temperature swing) | 1. The location of the thermostat and/or the size of the Heating System may be influencing the cycle rate. | Digital thermostats provide precise control and cycle faster than older mechanical models. The system turns on and off more frequently but runs for a shorter time so there is no increase in energy use. If you would like an increased cycle time, choose SL for slow cycle in the Configuration menu, step 6 (heat), 7 (cool) or 8 (heat pump). If an acceptable cycle rate is not achieved, contact a local HVAC service person for additional suggestions. |
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