TM 9-4120-385-14
4-8. TROUBLESHOOTING - Continued
Table 4-2. TROUBLESHOOTING FOR UNIT MAINTENANCE
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 8. Test heater elements.
Replace if defective. Refer to Paragraph 4-26.
WARNING
High voltage in air conditioner can kill.
Step 9. Trace out wiring and check for loose or broken connections. Refer to wiring
diagram (FO1).
Repair or replace as necessary. Refer to Paragraph 4-23.
5. TEMPERATURE SELECTOR SWITCH NOT EFFECTIVE
Step 1. Check return air filter and sensing bulb for dirt.
Clean return air filter and sensing bulb. Operate unit in HI HEAT
mode for 5 minutes and check air temperature.
Step 2. Check the temperature selector switch S1.
Replace if defective. Refer to Paragraph 4-18.
WARNING
High voltage in air conditioner can kill.
Step 3. Trace out wiring and check for loose or broken connections. Refer to wiring
diagram (FO-1).
Repair or replace as necessary. Refer to Paragraph 4-23.
4-21
