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Installation and User Guide
6.
Troubleshooting
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
and
at the same tie while moving the SYSTEM switch from OFF to HEAT. This also resets the factory defaults.
If the thermostat has power, has been reset and still does not function correctly contact your heating/cooling service person or place of
purchase.
Batteries
For best results, replace batteries once a year with new premium brand alkaline battery.
SYMPTOM
No Heat/
1.) Blown fuse or tripped circuit breaker
No Cool/
2.) Furnace power switch to OFF
No Fan
3.) Furnace blower compartment door panel
(common problem)
loose or not properly installed
1.) System Switch not set to Cool
2.) Loose connection to thermostat or system
No Cool
3.) Cooling System requires service or
thermostat requires replacement
1.) Pilot light not lit
2.) System Switch not set to Heat
3.) Loose connection to thermostat or system
No Heat
4.) Furnace Lock-Out Condition. Heat may
also be intermittent.
5.) Heating System requires service or
thermostat requires replacement
1.) Possible short in wiring.
Heat, Cool or Fan Runs
2.) Possible short in thermostat.
Constantly
3.) Possible short in heat/cool/fan system.
4.) FAN Switch set to Fan ON.
Furnace Cycles Too
1.) The location of the thermostat and/or the
Fast or Too Slow
size of the Heating System may be influencing
(narrow or wide
the cycle rate.
temperature swing)
Thermostat Display &
Thermometer Disagree
1. The location of the thermostat and the size
Cooling Cycles Too
of the Cooling System can influence the
Fast or Too Slow
cycle rate.
(narrow or wide
temperature swing)
Thermostat Setting and
1. Thermostat thermometer setting requires
Thermostat
adjustment.
Thermometer Disagree
Blank Display and/
1. Voltage spike or static discharge.
or Keypad Not
2. Battery change required.
Responding
Pub. No. 18HD54D1-1B-EN 09/2020
POSSIBLE CAUSE
37-7770002
Part No.
CORRECTIVE ACTION
1.) Replace fuse or reset breaker
2.) Turn switch to ON
3.) Replace door panel in proper position to engage safety interlock or door switch
1.) Set System Switch to Cool and lower setpoint below room temperature.
2.) Verify thermostat and system wires are securely attached.
3.) Same procedures 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.
1.) Re-light pilot.
2.) Set System Switch to Heat and raise the setpoint above room temperature.
3:) Verify thermostat and system wires are securely attached.
4.) Many surfaces have safety devices that shutdown when a lock-out condition occurs. If
the heat works intermittently contact the furnace manufacturer or local service person for
assistance.
5:) 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 below. 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.
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 time, clip Jumper W-905 as for Hydronic Heating Systems. It is not possible
to shorten the cycle time. If an acceptable cycle rate is not achieved as received or by clipping
W-905 contact a local service person for additional suggestions.
The cycle rate for cooling is fixed and can not be adjusted. Contact a local service person for
suggestions.
The thermometer can be adjusted +/- 3 degrees. See Temperature Display Adjustment in the
Operation section.
Replace batteries and check heat/cool system for proper operation. If a voltage spike occurs use
the Reset Operation listed above.
Trane XR102 Non-Programmable Thermostat
11
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