Troubleshooting - White Rodgers 1F85-275 Installation Instructions Manual

TROUBLESHOOTING

TROUBLESHOOTING
TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING
Reset Operation Reset Operation Reset Operation
Reset Operation Reset Operation
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 and removing batteries for 2 minutes. After resetting the thermo-
stat, 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.
Symptom Symptom Symptom Symptom Symptom
No Heat/No Cool/No Fan No Heat/No Cool/No Fan No Heat/No Cool/No Fan No Heat/No Cool/No Fan No Heat/No Cool/No Fan
(common problems) (common problems) (common problems) (common problems) (common problems)
No Heat No Heat No Heat No Heat No Heat
No Cool No Cool No Cool
No Cool No Cool
Heat, Cool or Fan Heat, Cool or Fan Heat, Cool or Fan Heat, Cool or Fan Heat, Cool or Fan
Runs Constantly Runs Constantly Runs Constantly
Runs Constantly Runs Constantly
Furnace Furnace
Furnace Furnace Furnace
(Air Conditioner) (Air Conditioner) (Air Conditioner) (Air Conditioner) (Air Conditioner)
Cycles Too Fast Cycles Too Fast Cycles Too Fast Cycles Too Fast Cycles Too Fast
or Too Slow (narrow or or Too Slow (narrow or or Too Slow (narrow or or Too Slow (narrow or or Too Slow (narrow or
wide temperature swing) wide temperature swing) wide temperature swing)
wide temperature swing) wide temperature swing)
10
Possible Cause Possible Cause Possible Cause Possible Cause Possible Cause
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.
1. Pilot light not lit.
2. System Switch not set to HEAT.
3. Loose connection to thermostat or
system.
4. Furnace Lock-Out Condition. Heat
may also be intermittent.
5. Heating system requires service or
thermostat requires replacement.
1. System Switch not set to COOL.
2. Loose connection to thermostat or
system.
3. Cooling system requires service or
thermostat requires replacement.
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.
1. The location of the thermostat and/or
the size of the Heating System may
be influencing the cycle rate.
Corrective Action Corrective Action Corrective Action Corrective Action Corrective Action
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.
Re-light pilot.
Set System Switch to HEAT and raise setpoint
above room temperature.
Verify thermostat and system wires are securely
attached.
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 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
service person to verify the heating is operating
correctly.
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 condi-
tion 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.
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.
Digital thermostats normally provide precise
temperature control and may cycle faster than
some older mechanical models. A faster cycle rate
means the unit turns on and off more frequently but
runs for a shorter time so there is no increase in
energy use. If you would like to increase the cycle
SL SL
time, choose SL SL for slow cycle in the menu, step 4. SL
If an acceptable cycle rate is not achieved as
received or by choosing slow cycle, contact a local
service person for additional suggestions.