CU50
Service Manual
Service Diagnosis
No Ice
Problem | Likely Cause | Probable Solution | |
No power to unit | Power disconnected | Check breaker or fuse. Reset or | |
replace, restart and check | |||
|
| ||
No power to controller | Transformer open | Replace transformer | |
Shut down on maximum |
|
| |
water fill time - water light | Water shut off | Restore water supply | |
flashing |
|
| |
| Water leak | Check curtain, sump | |
| Dirty condenser | Clean condenser | |
| Restricted location, intake air too | Eliminate restriction, have machine | |
| hot or blocked | moved | |
| Evaporator thermistor not sensing | Check thermistor | |
| properly | ||
|
| ||
Very long freeze cycle | Spray jets dirty | Remove spray platform and clean | |
spray jets | |||
| |||
|
| ||
| Inlet water valve leaks through | Check inlet water valve | |
| during freeze | ||
|
| ||
| Low on refrigerant | Check cube formation, | |
|
| Check for bleed thru from / missing | |
| Connected to hot water | check valve in building water | |
|
| supply | |
| Spray pump not pumping | Check pump motor | |
| Fan motor not turning | Check fan motor, check fan blade, | |
| check controller for voltage output | ||
|
| ||
| Pump hose disconnected | Check hose | |
|
| Add access valve, add refrigerant | |
| Very low on refrigerant | as a test. If unit makes ice, find and | |
|
| correct leak. | |
|
| Check compressor start | |
Cannot make ice |
| components, check PTCR | |
| Compressor not operating | resistance and temperature | |
| Check compressor voltage | ||
|
| ||
|
| Check compressor windings | |
| Hot gas valve leaks through during | Check hot gas valve for hot outlet | |
| freeze | during freeze | |
|
| Check compressor amp draw, if | |
| Compressor inefficient | low and all else is correct, change | |
|
| compressor |
March 2010
Page 24