5.Failed heat timer.
6.Failed dual timer relay.
B.Drive motor (ONLY) is not operating (does not start)...
1.Failed drive motor contactor.
2.Failed reversing timer (for Reversing Models ONLY).
3.Failed drive motor.
C.Blower (impellor/fan) motor (ONLY) is not operating (does not start)...
1.Tripped or failed overload.
2.Failed blower (impellor/fan) motor contactor (relay).
3.Failed reversing timer.
4.Failed blower (impellor/fan) motor.
D.Both drive motor and blower (impellor/fan) motor are not operating (DO NOT start) and indicator light is on...
1.Fault with L1 termination at reversing timer (for Reversing Models ONLY).
E.Reversing drive motor operates in one (1) direction ONLY, stops and restarts in same direction (for Reversing Models ONLY)...
1.Failed reversing contactor (relay).
2.Failed reversing timer.
F.Heating unit is not operating (no heat)...no voltage at heating unit (i.e., gas model Direct Spark Ignition [DSI] module or steam model damper system pneumatic solenoid)...
GAS MODELS
1.Fault in sail switch circuit...
a.Sail switch is out of adjustment and/or has failed.
b.Sail switch damper is not closing or is fluttering...
1)Check blower (impellor/fan) motor and rotation direction.
2)Restriction in exhaust ductwork.
3)Lint drawer/screen is dirty.
2.Failed burner
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