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8
TROUBLESHOOTING
Symptom
Possible Cause
No Heat/No Cool/
1. Blown fuse or tripped circuit breaker.
No Fan (common
2. Furnace power switch to OFF.
problems)
3. Furnace blower compartment door or
panel loose or not properly installed.
No Heat
1. Pilot light not lit.
2. Broken or melted anticipator wire.
3. Loose connection to thermostat or
system.
4. Thermostat or heating system requires
replacement or service.
5. System Switch not set to Heat.
Intermittent Heat
1. Furnace Lock-Out Condition
No Cool
1. Loose connection to thermostat or
system.
2. Thermostat or cooling system requires
replacement or service.
3. System Switch not set to Cool.
Heat, Cool or Fan
1. Possible short in wiring.
Runs Constantly.
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
Furnace Cycles Too
See Step 5, Adjusting the Anticipator.
Fast or Too Slow
(Narrow or wide
temperature swing)
Cooling Cycles Too
1. Poor thermostat location for sensing
Fast or Too Slow
room temperature.
(narrow or wide
2. Cooling system over or undersized.
temperature swing)
3. Excessive Current draw influencing
thermostat.
Thermostat Setting
1. Thermostat thermometer setting
and Thermostat
requires adjustment.
Thermometer Disagree
2. Thermostat setting lever requires
calibration.
Adjusting Thermometer
1. Thermostat thermometer disagrees
with other room thermometers.
Corrective Action
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or door switch.
Re-light pilot.
Excessive current or dead short in system. Have a qualified service person check the system
before replacing thermostat.
Verify thermostat and system wires are securely attached.
Your furnace manufacturer or service person can 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.
Set System Switch to Heat and raise temp above room temp.
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.
Verify thermostat and system wires are securely attached.
Your cooling system manufacturer 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.
Set System Switch to Cool and lower temp below room temp.
Check each wire connection to the thermostat to verify it is neatly looped under the terminals.
No extra wire should stick out from under the terminals.
The anticipation setting is the only adjustment that 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.
The cycle rate for cooling can not be adjusted. The location of the thermostat, size of the
Cool system and current draw can influence the cycle rate. Contact a local service person for
suggestions.
The thermometer can be adjusted by using a standard slotted screwdriver. Turn the
thermometer pointer screw located inside the front cover to change the setting. For calibrating
the setting lever contact a local heating and cooling service person.
The thermometer on the thermostat is accurately calibrated at our factory but you can adjust
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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