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6

TROUBLESHOOTING 

Reset Operation

 

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat 
by pressing the reset button (see fig.1) . If the thermostat has power, has been reset and still does not function correctly contact 
your heating/cooling service person or place of purchase.

Symptom

Possible Cause

Corrective Action

No Heat/No Cool/No Fan
(common problems)

Blown fuse or tripped circuit breaker.    

1. 

Furnace power switch to OFF. 

2. 

Furnace blower compartment door or  panel 

3. 

loose or not properly installed.

Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or 

door switch. 

No Heat

System Switch not set to Heat.

 

1. 

Loose connection to thermostat or system.

2. 

Heating System requires service or 

3. 

thermostat requires replacement.

Set System Switch to Heat and raise setpoint above room 

temperature.

Verify thermostat and system wires are securely attached.
Diagnostic: Set System Switch to Heat and raise the setpoint 

above room temperature. Within five minutes 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 service person to verify the 
heating system is operating properly.

No Cool

System Switch not set to Cool.

 

1. 

Loose connection to thermostat or system.

2. 

Cooling System requires service or 

3. 

thermostat requires replacement.

Set System Switch to Cool and lower setpoint below room 

temperature.

Verify thermostat and system wires are securely attached.

 

Same procedure 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 if the compressor lock-out option is 
selected in the configuration menu (Item 6).

Heat, Cool or Fan 
Runs Constantly

Possible short in wiring.

1. 

Possible short in thermostat.

2. 

Possible short in Heat/Cool/Fan system.

3. 

Fan Switch set to Fan On.

4. 

Check each wire connection to verify they are not shorted or 
touching together. No bare wire should stick out from under 

terminal screws. 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.

Furnace Cycles Too Fast 
or Too Slow
(narrow or wide 
temperature swing)

The location of the thermostat and/or 

1. 

the size of the Heating System may be 

influencing the cycle rate.

Item 2 in the Configuration Menu is the adjustment that controls 

the cycle rate. If an acceptable cycle rate is not achieved using the 

FA (Fast) or SL (Slow) adjustment contact a local service person 

for additional suggestions.

Cooling Cycles Too 
Fast or Too Slow
(narrow or wide 
temperature swing)

The location of the thermostat and/or 

1. 

the size of the Cooling System may be 

influencing the cycle rate.

The cycle rate for cooling is fixed and can not be adjusted. Contact 

a local service person for suggestions.

Thermostat Setting and 
Thermometer Disagree 

Thermostat thermometer setting requires  

1. 

adjustment. 

The thermometer can be ad/- 4 degrees as listed in item 7 
of the Configuration Menu. No other adjustment is possible.

Blank Display and/or 
Keypad Not Responding  

Loss of power.

1. 

Voltage Spike or Static Discharge.

2. 

Check heat/cool system for power.
If a voltage spike or static discharge occurs use the Reset 
Operation listed above.

OPERATING FEATURES

Now that you are familiar with the thermostat buttons and display, 

read the following information to learn about the many features 
of the thermostat.

• 

SIMULTANEOUS HEATING/COOLING SETPOINT STOR-
AGE 

— You can enter both your heating and cooling set-

points at the same time. There is no need to change the 
thermostat at the beginning of each season.

• 

CONFIGURATION  MENU  —  Allows  you  to  customize 

certain thermostat options.

OPERATION 

SETTING THE THERMOSTAT

This  thermostat  is  very  easy  to  operate.  Set  the  SYSTEM 
switch to either HEAT or COOL then press 

 and 

 until 

the temperature you want to maintain is shown on the right side 
of the display. If you want to turn the system off, just move the 

SYSTEM switch to OFF.
The  FAN  switch  controls  the  fan  operation.  When  the  FAN 
switch is set to AUTO, the fan will cycle with the furnace or air 
conditioner. When the FAN switch is set to ON, the fan will run 
continuously, regardless of SYSTEM switch position.

Summary of Contents for 1F89-211

Page 1: ...sformer systems Optional AA batteries to provide continuous temperature display during loss of AC power SPECIFICATIONS ELECTRICAL DATA Electrical Rating 20 to 30 VAC 50 60 Hz or D C 0 05 to 1 0 Amps L...

Page 2: ...oca tions on wall using base as a template 4 Move base out of the way Drill mounting holes 5 Fasten base loosely to wall as shown in fig 1 using two mounting screws Place a level against bottom of bas...

Page 3: ...ly one of the systems remove the transformer of the system with NO safety circuits NOTE Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency See Note L R E SYSTEM MONITOR...

Page 4: ...to adjust temperature setting above room tem perature The cooling system should stop operating THERMOSTAT QUICK REFERENCE 2 1 3 4 5 8 10 6 9 5 8 7 Figure 5 Thermostat display buttons and switches SU...

Page 5: ...just under 6 F and the SL setting cycles at approximately 1 F 4 Select backlit display d L OFF or ON The display backlight improves display contrast in low lighting conditions Selecting backlight ON...

Page 6: ...et to Fan On 4 Check each wire connection to verify they are not shorted or touching together No bare wire should stick out from under terminal screws Try resetting the thermostat as described above I...

Page 7: ...7 NOTES...

Page 8: ...ww 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 C...

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