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INDICATION
PROBABLE CAUSE
POSSIBLE SOLUTION
A. No System Power
1. Ground power not connected
1. Plug in ground power cart
2. Aircraft power switch off
2. Energize power switch
B. Power On But System Will Not Operate
1. Air conditioner breaker off
1. Turn on
2. Air conditioner breaker failed
2. Replace
3. Air conditioner mode switch failed
3. Replace
4. Relay(s) failed
4. Replace
5. Failed pressure switch
5. Replace
6. Failed drive motor
6. Replace
7. Vented system
7. Pressure check, evacuate and charge
8. Low ambient temperature
8. Normal cut out function
9. Drive motor fuse blown
9. Replace
10. Contactor control line fuse blown
10. Replace
Table 3 Trouble Shooting List
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 1007
FEBRUARY 16, 2010
INDICATION
PROBABLE CAUSE
POSSIBLE SOLUTION
C. System Operates But Does Not Cool
1. Low refrigerant charge
1.Charge as required
2. Overcharged system cutout
2. Reclaim refrigerant as required
3. Failed Compressor
3. Replace
4. Failed Drive Motor
4. Replace
5. Broken Belt
5. Replace
6. Failed expansion valve(s)
6. Replace
7. Evaporator blower switch failed
7. Replace
8. Evaporator blower motor failed
8. Replace
9. evaporator blower failed
9. Replace
10. evaporator blowers circuit breaker
10. Energize or Replace
11. Relays failed
11. Replace
12. Evaporator module air inlet clogged
12. Remove Debris
13. Expansion valve inlet clogged
13. Remove Debris
14. Excessive moisture in system
14. Replace receiver dryer
15. Excessive oil in system
15. Drain excessive oil
D. Evaporator Noisy
1. Blower wheel out of round
1. Replace
2. Blower wheel hitting scroll
2. Align
3. Defective blower motor bearing
3. Replace motor
4. Loose mounting bracket
4. Tighten hardware
5. Air inlet clogged
5. Remove debris
E. Compressor Noisy
1. Loose drive belt
1. Tension belt
2. Drive belt hitting cover
2. Align belt & adjust bracket
3. Motor fan hitting shroud
3. Adjust as required
4. Defective compressor
4. Replace
5. Defective drive pulley
5. Replace
6. Loose pulley
6. Tighten or replace
7. Loose mounting hardware
7. Tighten as required
8. Loose hose assembly
8. Secure as required
9. Loose fan blade
9. Tighten or replace
Table 3 Trouble Shooting List
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 1008
FEBRUARY 16, 2010
INDICATION
PROBABLE CAUSE
POSSIBLE SOLUTION
F. Compressor Assembly Will Not Operate
1. Circuit Breaker failed or off
1. Energize or replace
2. Relay failed
2. Replace
3. Pressure switch failed
3. Replace
4. Drive motor failed
5. Replace
5. Drive motor fuse blown
6. Replace
6. Ground power cart not plugged in
7. Connect as required
7. Low ambient temperature
8. Normal cutout
8. Low refrigerant charge
9. Charge system
9. Motor temperature switch failed
10. Replace switch
G. No Evaporator Module Air Flow
1. Circuit breaker off
1. Energize or replace
2. Mode switch failed
2. Replace
3. Fan speed switch failed
3. Replace
4. Seized motor
4. Replace
5. Blower wheel failed
5. Replace
6. Blocked air ducts
6. Remove debris
7. Aircraft power not on
7. Energize
8. Ground power not on
8. Energize
H. Evaporator Module Coil Freezing
1. No air flow
1. Turn fan on
2. Expansion valve failed or clogged
2. Remove debris or replace
I Pressure Switch Cycles (High Pressure Cutout)
1. System over charged
1. Reclaim refrigerant as required
2. Condenser coil inlet air extremely hot
2. Normal condition
3. Condenser inlet clogged
3. Remove debris
4. Discharge line clogged or kinked
4. Replace or straighten line
5. Excessively high ambient temperature
5. Normal Condition
Table 3 Trouble Shooting List
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
　
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