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INDICATION
F. Compressor Assembly Will
Not Operate
G. No Evaporator Module Air
Flow
H. Evaporator Module Coil
Freezing
I. Pressure Switch Cycles (High
Pressure Cutout)
Copyright © 2020
Page | 19
PROBABLE CAUSE
1. Circuit Breaker failed or off
2. System Over Charged/Over
Pressurized
3. Pressure switch failed
4. Drive motor failed
5. Ground power cart not plugged
In
6. Low ambient temperature
7. Low refrigerant charge
8. Controller over temperature
switch open
1. Circuit breaker off
2. Mode switch failed
3. Fan speed switch failed
4. Seized motor
5. Blower wheel failed
6. Blocked air ducts
7. Aircraft power not on
8. Ground power not on
1. No air flow
2. Expansion valve failed or
clogged
1. System over charged
2. Condenser coil inlet air
extremely hot
3. Condenser inlet clogged
4. Discharge line clogged or
kinked
5. Excessively high ambient
temperature
Original Release
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
www.enviro-ok.com
passenger
www.safran‐
POSSIBLE SOLUTION
1. Energize or replace
2. Evacuate and Recharge to
correct amount.
3. Replace
4. Replace Compressor Drive
5. Connect as required
6. Normal cutout
7. Charge system
8. Allow unit to cool. If switch still
open, replace Compressor Drive
1. Energize or replace
2. Replace
3. Replace
4. Replace
5. Replace
6. Remove debris
7. Energize
8. Energize
1. Turn fan on
2. Remove debris or replace
1. Reclaim refrigerant as required
2. Normal condition
3. Remove debris
4. Replace or straighten line
5. Normal Condition
ATA 21‐00‐60
‐solutions.com
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