Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Page
1006
JULY 21, 2011
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 Evaporator
9. Evaporator blower failed
9. Replace Evaporator
10. Evaporator blows 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 Evaporator
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
F. No low evap. Fan speed
(hi speed ok)
1. Failed switch
1. Replace
2. Failed resistor
2. Replace Evaporator
3. Failed relay
3. Replace
Table 3 Trouble Shooting List
