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Symptom Possible Cause Corrective Action
No Heat/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 Diagnostic: 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.
Heat or Fan Runs Constantly 1. Possible short in wiring. Check each wire connection to verify they are
2. Possible short in thermostat. not shorted or touching together. No bare wire
3. Possible short in Heat/Cool/Fan system. should stick out from under terminal screws. Try
4. Fan Switch set to Fan On. resetting the thermostat as described below.
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.
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.
Thermostat Does Not Follow Program 1. AM or PM set incorrectly in program. Check current clock and program settings including
2. AM or PM set incorrectly on the clock. the AM or PM designations for each time period.
3. Voltage spike or static discharge. If a voltage spike or static discharge occurs use the
Reset Operation listed below.
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 below.
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermo-
stat by pressing
, and TIME at the same time. This also
resets the factory defaults to the configuration menu and
program. If the thermostat has power, has been reset and still
does not function correctly contact your heating/cooling ser-
vice person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries
once a year with fresh "AA" Energizer
®
alkaline batteries.