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Symptom

Possible Cause

Correction 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 ad/- 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.

Forgot Keypad Lockout 
Code

Hold MENU key for 20 seconds and the lockout will reset.

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 

and 

(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 

 and the FAN button simultaneously. The 

thermostat should go blank and then all segments will be 
displayed momentarily.

Summary of Contents for 1F85-0477

Page 1: ...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 Refer to www white rodgers com for locati...

Page 2: ...k into position To replace the batteries set system to OFF 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 approxi mately half the will be displayed When Change is displayed install fresh AA alkaline batteries immediately For best ...

Page 3: ...E to use the Auxiliary Heat in the Emergency Mode Common connection required for fault or malfunction indication Heat Pump 2 HP2 Heat Pump 1 HP1 O Energized in Cool Mode B Energized in Heat Off Emergency Mode 2nd Stage Com pressor No Output Heat and Cool Mode 1st Stage Compressor Blower Circulator Fan Energized on Call for Heat or Cool Set Elect Gas Option for Emergency Mode Heat Mode 2nd Stage Em...

Page 4: ...Hot Cool System Y G W E C L RC CLASS II TRANSFORMER HOT 24VAC NEUTRAL 120VAC 24 Volt Hot Heat RH 120VAC Remove Jumper Wire between RH RC HOT 24VAC NEUTRAL CLASS II TRANSFORMER HEATING COOLING Y2 W2 Jumper O B O Energized Constantly in Cool Mode B Energized Constantly in Heat Off Emergency Mode Single Stage 3 wire Zone Valve application Blower Circulator Fan Energized Opens Valve 4 Constant 24 Volt...

Page 5: ...ergized 2 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 3 Displays Change Filter when the system has run for the programmed filter time period as a reminder to change or clean your filter 4 Displays Set for setpoint when in Run Program mode 5 Displays System Mode Heat Em Auto Cool Off or Time in Menu Mode 6...

Page 6: ...if Heat Pump is selected in item 1 9 8 8 MENU CL OFF CL On Compressor Lockout Time 10 9 9 MENU Heat Auto 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 capability 11 10 10 MENU dL On dL OFF Selects Display Light On or OFF 12 11 11 MENU 0 current temperature 1 HI 2 HI 3 HI 4 HI 1 LO 2 LO 3 LO 4 LO Adjusta...

Page 7: ...on in the Cool mode press Cool Savings The display will show Save next to the setpoint temperature When Cool Savings is making ad justments to the room temperature display Save will be flashing and the displayed room temperature may vary within the adjustment range you selected If Save is not displayed and this feature is OFF no change will occur when the cooling system is continu ously running du...

Page 8: ...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 or RUN...

Page 9: ...with the times and temperatures you want If you are re programming a 5 1 1 fill in your own times and temperatures directly below the factory times and tempera tures 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 tha...

Page 10: ...F 10 00 PM 62 F PROGRAMMING TROUBLESHOOTING Comfort Alert Codes The Comfort Alert diagnostics product monitors the air conditioning outdoor systems with single phase Copeland Scroll compressors Abnormal system and electrical conditions are indicated by flashing ALERT codes on the yellow LED on the Comfort Alert module The flash codes are transmitted to the thermostat by the Comfort Alert Thermosta...

Page 11: ...re 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 a...

Page 12: ... www white rodgers com www emersonclimate com Homeowner Help Line 1 800 284 2925 White Rodgers is a division of Emerson Electric Co The Emerson logo is a trademark and service mark of Emerson Electric Co ...

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