TM 9-4120-399-14
Table 3-1. Operator Troubleshooting. - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Check to see if DC control circuit breaker is in the ON position.
Step 4.
Place control circuit breaker in the ON position.
Step 5.
Check to see if compressor circuit breaker is in the ON position.
Place compressor circuit breaker in the ON position.
If unit still malfunctions, notify your supervisor.
2. INSUFFICIENT COOLING.
Check to see if mode selector is in COOL position.
Step 1.
Place mode selector in COOL position.
Check to see if temperature selector is in DECREASE position.
Step 2.
Place temperature selector in DECREASE position.
Check to see AC and DC control circuit breakers are in the ON
Step 3.
position.
Place control circuit in the ON position.
Check to see air filter is not obstructed.
Step 4.
If air filter is obstructed, notify your supervisor.
Inspect sight indicator for bubbles or yellow color.
Step 5.
If sight indicator has bubbles or is yellow, notify your supervisor.
3. INSUFFICIENT HEATING (LOW HEAT).
Check to see if mode selector is in LOW HEAT position.
Step 1.
Place mode selector in LOW HEAT position.
Check to see if DC control circuit breaker is in the ON position.
Step 2.
Place control circuit breaker in the ON position.
3-2