Table 3-1. Troubleshooting
TEST OR INSPECTION
AIR CONDITIONER FAILS TO OPERATE
Check to see if main power cord is plugged in.
Connect power cable to receptacle (Figure 2-1) supplying 208 VAC, 3 phase
power of the proper frequency.
Check to see if control and compressor circuit breakers are in OFF position.
Reset circuit breakers (Figure 2-1).
Check to see if mode selector switch is in OFF position.
Turn selector switch to desired operation (Figure 2-1).
If air conditioner still is inoperative, report condition to organization maintenance.
Check to see if mode selector switch is in proper position.
Set switch to COOL (Figure 2-1).
Check to see if temperature selector switch is in correct position.
Adjust setting to COOLER (Figure 2-1).
Check to see if sufficient air is passing over evaporator coil.
Open evaporator inlet louvers (Figure 2-1).
Remove any obstructions from
evaporator inlet and outlet louvers.
Inspect for clogged air filter.
Report clogged filter condition to organizational maintenance.
Check to see if too much outside air is entering unit.
Close or adjust damper door (Figure 2-1).
Check to see if the system contains sufficient refrigerant by inspecting
liquid sight indicator (paragraph 3-8).
Check to see if evaporator fan speed switch is set to LOW speed position.
Reset switch to HIGH speed position (Figure 2-1).
Check to see if sufficient air is passing through condenser coil.
Remove any obstructions from condenser fan inlet and outlet.
NO HEAT OR LOW CAPACITY HEAT
Check to see if mode selector switch is properly set.
Set switch to LOW HEAT or HIGH HEAT (Figure 2-1).
Check to see if temperature selector switch is set correctly.
Adjust to WARMER setting (Figure 2-1).
Check for insufficient air movement over heaters.
Remove any obstructions from evaporator air intake and discharge louvers.
Make sure intake louvers are open (Figure 2-1).