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. Broken or melted anticipator wire. Excessive current or dead short in system. Have a qualified service person check the system before
replacing thermostat.
3. Loose connection to thermostat or system. Verify thermostat and system wires are securely attached.
4. Thermostat or heating system requires Your furnace manufacturer or service person can describe how to test the heating system to verify it is
replacement or service. operating correctly. If the heating system is capable of operation and the no heat condition persists,
replace the thermostat.
5. System Switch not set to Heat. Set System Switch to Heat and raise temp above room temp.
Intermittent Heat
1. Furnace Lock-Out Condition Many furnaces have safety devices that shut the system down when a lock-out condition occurs. If the
heat works intermittently contact the furnace manufacturer or local service person for assistance.
No Cool
1. Loose connection to thermostat or system. Verify thermostat and system wires are securely attached.
2. Thermostat or cooling system requires Your cooling system manufacturer or service person can describe how to test the cooling system to
replacement or service. verify it is operating correctly. If the cooling system is capable of operation and the no cooling condition
persists, replace the thermostat.
3. System Switch not set to Cool. Set System Switch to Cool and lower temp below room temp.
Heat, Cool or Fan Runs
1. Possible short in wiring. Check each wire connection to the thermostat to verify it is neatly looped under the terminals. No extra
Constantly.
2. Possible short in thermostat. wire should stick out from under the terminals.
3. Possible short in heat/cool/fan system.
Furnace Cycles Too Fast
See Step 5, Adjusting the Anticipator. The anticipation setting is the only adjustment that effects the heating cycle rate. If an acceptable cycle rate
or Too Slow Narrow or
is not achieved using the anticipator contact a local service person for additional suggestions. The location of
wide temperature swing
the thermostat, size of the Heat/Cool System and current draw can influence the cycle rate.
Cooling Cycles Too Fast
1. Poor thermostat location for sensing room The cycle rate for cooling can not be adjusted. The location of the thermostat, size of the Cool system and
or Too Slow (narrow or
temperature. current draw can influence the cycle rate. Contact a local service person for suggestions.
wide temperature swing)
2. Cooling system over or undersized.
3. Excessive Current draw influencing thermostat.
Thermostat Setting and
1. Thermostat thermometer setting requires The thermometer can be adjusted by using a standard slotted screwdriver. Turn the thermometer pointer
Thermostat Thermometer
adjustment. screw located inside the front cover to change the setting. For calibrating the setting lever contact a local
Disagree
2. Thermostat setting lever requires calibration. heating and cooling service person.
Adjusting Thermometer
1. Thermostat thermometer disagrees with The thermometer on the thermostat is accurately calibrated at our factory but you can adjust it by using a
other room thermometers. standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change
the setting.
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