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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
replacement or service. describe how to test the heating system to verify
it is 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
replacement or service. person can describe how to test the cooling
system to 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 Constantly. 1. Possible short in wiring. Check each wire connection to the thermostat to
2. Possible short in thermostat. verify it is neatly looped under the terminals. No
3. Possible short in heat/cool/fan system. extra wire should stick out from under the
terminals. As an added layer of insulation put a
piece of electricians tape across the terminals on
the subbase.
Furnace Cycles Too Fast or Too Slow See Step 5, Adjusting the Anticipator. The anticipation setting is the only adjustment that
Narrow or wide temperature swing effects the heating cycle rate. If an acceptable
cycle rate is not achieved using the anticipator
contact a local service person for additional
suggestions. The location of the thermostat, size
of the Heat/Cool System and current draw can
influence the cycle rate.
Cooling Cycles Too Fast or Too Slow 1. Poor thermostat location for sensing room The cycle rate for cooling can not be adjusted.
(narrow or wide temperature swing) temperature. The location of the thermostat, size of the Cool
2. Cooling system over or undersized. system and current draw can influence the cycle
3. Excessive Current draw influencing thermostat. rate. Contact a local service person for suggestions.
Thermostat Setting and Thermostat 1. Thermostat thermometer setting requires The thermometer can be adjusted by using a
Thermometer Disagree adjustment. standard slotted screwdriver. Turn the thermom-
2. Thermostat setting lever requires calibration. eter pointer screw located inside the front cover
to change the setting. For calibrating the setting
lever contact a local heating and cooling service
person.
Adjusting Thermometer 1. Thermostat thermometer disagrees with The thermometer on the thermostat is accurately
other room thermometers. calibrated at our factory but you can adjusted it
by using a standard slotted screwdriver. Turn the
thermometer pointer screw located inside the
front cover to change the setting.
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