TM 5-4520-240-14
Table 6-1. Direct Support and General Support Troubleshooting -- Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. HEATER OVERHEATS.
Step 1. Disconnect power plug and remove top and side cover panels. Check that the ventilation air impeller is tight on the motor shaft,
and not damaged.
Tighten the impeller, or replace it if defective (para 10-2 thru 10-4).
Step 2. Connect power plug, start heater, and observe blower operation with cover panels removed.
Repair blower motor if motor runs slowly or vibrates due to defective bearings, or if the motor protector switch
S4 (fig. 1-3) trips out. Refer to paragraphs 10-2 thru 10-4.
5-2