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INDICATION
A. No System Power
B. Power On But System Will
Not Operate
C. System Operates But Does
Not Cool
D. Evaporator Noisy
E. Compressor Noisy
Copyright © 2020
Page | 18
Table 4 Trouble-shooting
PROBABLE CAUSE
1. Ground power not connected
2. Aircraft power switch off
1. Air conditioner breaker off
2. Air conditioner breaker failed
3. Air conditioner mode switch
failed
4. Failed pressure switch
5. Vented system
6. Low ambient temperature
1. Low refrigerant charge
2. Overcharged system cutout
3. Failed Compressor
4. Failed Drive Motor
5. Failed expansion valve(s)
6. Evaporator blower switch failed
7. Evaporator blower motor failed
8. Evaporator module air inlet
clogged
9. Expansion valve inlet clogged
10. Excessive moisture in system
11. Excessive oil in system
1. Blower wheel out of round
2. Blower wheel hitting scroll
3. Defective blower motor bearing
4. Loose mounting bracket
5. Air inlet clogged
1. Defective compressor
2. Loose mounting hardware
3. Loose hose assembly
4. Loose fan blade
Original Release
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
www.enviro-ok.com
passenger
www.safran‐
POSSIBLE SOLUTION
1. Plug in ground power cart
2. Energize power switch
1. Turn on
2. Replace
3. Replace
4. Replace
5. Pressure check, evacuate and
charge
6. Normal cut out function
1.Charge as required
2. Reclaim refrigerant as required
3. Replace Compressor Drive
4. Replace Compressor Drive
5. Replace
6. Replace
7. Replace Evaporator Motor
8. Remove Debris
9. Remove Debris
10. Replace receiver dryer
11. Drain excessive oil
1. Replace
2. Align
3. Replace Evaporator Motor
4. Tighten hardware
5. Remove debris
1. Replace Compressor Drive
2. Tighten as required
3. Secure as required
4. Replace Compressor Drive
ATA 21‐00‐60
‐solutions.com
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