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B. Drive motor (only) 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) not operating (does not start)...
1. Tripped or failed overload.
2. Failed impellor (impellor/fan) motor contactor (relay).
3. Failed reversing timer.
4. Failed blower (impellor/fan) motor.
D. Both drive and blower (impellor/fan) motors 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 direction only, stops, and restarts in same direction
(for Reversing Models ONLY) ...
1. Failed reversing contactor (relay).
2. Failed reversing timer.
F. Heating unit not operating (no heat)...no voltage at heating unit (i.e., Gas Model DSI module or
Steam Model damper system pneumatic solenoid)...
GAS MODELS
1. Fault in sail switch circuit ...
a. Sail switch 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.
3) Lint drawer / screen is dirty.
2. Failed burner hi-limit circuit.
3. Failed lint compartment automatic (225º) safety thermostat circuit.
4. Failed Direct Spark Ignition (DSI) Module (burner control).
5. Failed Direct Spark Ignition (DSI) ignitor/flame-probe assembly.
6. Failed heat selector switch.