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TROUBLESHOOTING
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan 1. Blown fuse or tripped circuit breaker. Replace fuse or reset breaker.
(common problems) 2. Furnace power switch to OFF. Turn switch to ON.
3. Furnace blower compartment door or Replace door panel in proper position to engage
panel loose or not properly installed. safety interlock or door switch.
No Heat 1. Pilot light not lit. Re-light pilot.
2. System Switch not set to Heat. Set System Switch to Heat and raise setpoint
above room temperature.
3. Loose connection to thermostat or system. Verify thermostat and system wires are securely
attached.
4. Furnace Lock-Out Condition. Heat may also Many furnaces have safety devices that shut the
be intermittent. system down when a lock-out condition occurs.
If the heat works intermittently contact the furnace
manufacturer or local service person for assistance.
5. Heating System requires service or Diagonistic: Set System Switch to Heat and raise
thermostat requires replacement. 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 system is
operating correctly.
No Cool 1. System Switch not set to Cool. Set System Switch to Cool and lower setpoint
below room temperature.
2. Loose connection to thermostat or system. Verify thermostat and system wires are securely
attached.
3. Cooling System requires service or thermostat Same procedure as diagnostic for No Heat
requires replacement. 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. 1. Fan Switch set to Fan On. Check each wire connection to verify they are
2. Possible short in wiring. not shorted or touching together. No bare wire
3. Possible short in thermostat. should stick out from under terminal screws.
4. Possible short in Heat/Cool/Fan system. Try resetting the thermostat. 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 1. The location of the thermostat and/or the size Item 2 in the Configuration Menu is the adjustment
(narrow or wide temperature swing) of the Heating System may be influencing the that controls the cycle rate. If an acceptable cycle
cycle rate. 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 1. The location of the thermostat and/or the size The cycle rate for cooling is fixed and can not be
(narrow or wide temperature swing) of the Cooling System may be influencing the adjusted. Contact a local service person for
cycle rate. suggestions.
Thermostat Setting and Thermometer 1. Thermostat thermometer setting requires The thermometer can be adjusted +/- 4 degrees as
Disagree adjustment. listed in item 7 of the Configuration Menu. No other
adjustment is possible.
Blank Display and/or Keypad Not 1. Loss of power and dead batteries. Replace batteries and check heat/cool system for
Responding 2. Voltage Spike or Static Discharge. proper operation. If a voltage spike or static discharge
occurs use the Reset Operation listed above.
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