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22
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan
(common problems)
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.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to
engage safety interlock or door switch.
No Cool 1. SYSTEM Switch not set to Cool.
2. Loose connection to thermostat or
system.
3. Cooling system requires service or
thermostat requires replacement.
Set SYSTEM Switch to COOL and
lower setpoint temperature below room
temperature.
Verify thermostat and system wires are
securely attached.
Same procedure as diagnostic for No
Heat condition except set the thermostat
to COOL and lower the setpoint below
the room temperature. There may be
up to a ve minute delay before the
thermostat clicks in Cooling.
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