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37
Ice Purge Cycle
1. Control Board a) No power to gear motor.
b) No power to compressor control relay.
2. Gear Motor a) Blown fuse.
b) Internal protector open.
c) Defective.
Freeze Cycle
1. Compressor Control
Relay
a) No voltage from gear motor.
b) Defective.
2. Control Board a) Defective.
3. Start Relay a) Bad contacts.
b) Coil winding opened.
c) Loose connections.
4. Capacitor (start or run) a) Defective, weak.
5. Power Supply a) Not within specications.
6. Refrigerant Line a) Gas leaks.
b) Refrigerant line or component restricted.
7. Thermostatic
Expansion Valve
(TXV) (not adjustable)
a) Defective.
8. Compressor a) Defective.
9. Liquid Line Valve
(MLH models)
a) Defective.
10. Suction Line Valve
(MLH models)
a) Defective.
11. Fan Motor
(if applicable)
a) Compressor Control Relay/Magnetic Contactor defective.
b) Defective capacitor.
c) Defective.
d) Control board defective.
12. Evaporator a) Dirty.
b) Damaged or defective.
13. Headmaster (C.P.R.)
(remote air-cooled
model)
a) Not operating properly and liquid line temperature too warm.
14. Water Supply Line
(water-cooled model)
a) Condenser water pressure too low or off and high pressure control opens and
closes frequently.
15. Water Regulating
Valve
(water-cooled model)
a) Set too high.
16. Magnetic Contactor
(if applicable)
a) Defective.
1 7. Drain Valve a) Dirty, leaking by.
b) Defective.
18. Water System a) Water leaks.
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