White Rodgers 1F85ST-0422 User Manual

8

Reset Operation
Note: When thermostat is reset, installer confi guration 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 confi guration menu 
settings.
To reset the programming, clock and confi guration settings, 
press

 and 

 and the VENT button simultaneously. 

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

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.

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 SISTEMA Switch to CALOR 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.

1. Cooling system requires service or
  thermostat requires replacement.

Same as diagnostic for No Heat condition except set the 
thermostat to FRIO and lower the setpoint below the room 
temperature. There may be up to a fi ve minute delay before 
the thermostat clicks in Cooling.

1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool/vent system.
4. VENT 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.

1. Thermostat thermometer setting
  requires adjustment.

The thermometer can be adjusted +/- 4 degrees. See 
Temperature Display Adjustment in the Confi guration Menu 
section.

1. The location of the thermostat and/or
  the size of the Heating System may
  be infl uencing 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 bA for slow cycle in the Confi guration 
menu, step 6 (Calor), 7 (Frio) or 8 (Bomba de Calor). If an 
acceptable cycle rate is not achieved, contact a local HVAC 
service person for additional suggestions.

White-Rodgers is a division
of Emerson Electric Co.

The Emerson logo is a 
trademark and service mark
of Emerson Electric Co.