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8. TROUBLESHOOTING
Symptom
Possible Cause
Corrective Action
No Heat/No Cool/No Fan
(common problem)
1. Blown fuse or tripped circuit breaker
2. Furnace power switch to OFF
3. Furnace blower compartment door or
panel loose or not properly installed
4. Loose connection to thermostat or
system
1. Replace fuse or reset breaker.
2. Turn switch to ON.
3. Replace door panel in proper position to
engage safety interlock or door switch.
4. Tighten connections
No Heat
1. System not set to Heat
2. Loose connection to thermostat or
system
3. Heating System requires service or
thermostat requires replacement
1. Set thermostat to Heat.
2. Verify thermostat and system wires are
securely attached.
3. Diagnostic: Set System to Heat and raise
the setpoint above room temperature.
Within five minutes the thermostat should
make a soft click sound and “Heat On”
should appear on display.