EVAPORATOR BLOWER MOTOR FAILS TO START

TM9-4120-423-14&P

MALFUNCTION

EVAPORATOR BLOWER MOTOR FAILS TO START. (Compressor, condenser blower

motor, and heaters start).

TEST OR INSPECTION

Step 1. Check relay K3. (See WP0038)

CORRECTIVE ACTION

Replace if found bad.

TEST OR INSPECTION

Step 2. Check motor B3. (See WP0030)

CORRECTIVE ACTION

Replace if found bad.

MALFUNCTION

INSUFFICIENT HEATING

TEST OR INSPECTION

Step 1. Check to see that MODE SELECTOR SWITCH is properly positioned.

CORRECTIVE ACTION

Set switch to LOW HEAT or HIGH HEAT.

NOTE

During LOW HEAT operation only, one bank (nine) of the heaters is operational.

The TEMPERATURE CONTROL thermostatically controls these heaters.

During HIGH HEAT operation, an additional second bank (six) of heaters

operates continuously.

TEST OR INSPECTION

Step 2. Check that TEMPERATURE CONTROL is set to WARMER position.

CORRECTIVE ACTION

Set TEMPERATURE CONTROL to WARMER position (see WP0006).

TEST OR INSPECTION

Step 3. Inspect fresh and return air filters for dirt or blockage (see WP0027).

CORRECTIVE ACTION

Clean filter/remove blockage.

TEST OR INSPECTION

Step 4. Check relays K4 and K5. (See WP0038).

CORRECTIVE ACTION

Replace if found bad.

TEST OR INSPECTION

Step 5. Check thermostatic switches S2 and S3. (See WP0020).

CORRECTIVE ACTION

Replace if found bad.

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