CONDITIONED (EVAPORATOR) AIR FAN DOES NOT START OR STOPS DURING OPERATION IN ANY MODE.

TM5-4120-38314

TROUBLESHOOTINGContinued

Table 42.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Tighten or replace connectors, or repair damaged

wires.

Check that internal wiring at terminal board TB3 is

Step 4.

wired for connector to which input power is

connected.

See paragraph 4-4 and move wires if necessary.

(See para

Check for defective circuit breaker.

Step 5.

Replace circuit breaker if defective.

(See

Check for defective MODE SELECTOR switch.

Step 6.

Replace switch if defective.

CONDITIONED (EVAPORATOR) AIR FAN DOES NOT START OR STOPS

DURING OPERATION IN ANY MODE.

Disconnect input power before performing

internal electrical troubleshooting. Voltages

used can be lethal.

(See para

Check operation of evaporator fan motor.

Step 1.

Test motor.

Replace motor if defective.

(See para

Check operation of MODE SELECTOR switch.

Step 2.

Test switch.

Replace switch if defective.

(See fig.

Check electrical connections and wiring.

Step 3.

Tighten or replace connectors or repair or

replace damaged wires.

4-30