Service manual

25
Installation and Service Manual
COMPONENT DIAGNOSTICS
DECISION TREE BEFORE REPLACING A THERMISTOR
SERVICE SYMPTOM COMMON MISDIAGNOSIS ACTUAL DIAGNOSIS
1.Eratic bridge thickness Replace thermistor Dirty evaporator
Dirty water system
Exposed TXV bulb
Flooding TXV
2.Freezes for 2-3 minutes Replace thermistor Slushing
then goes into harvest Ice bridge too thin
3. Ice frozen to the curtain Replace thermistor Hall switch lost target area and
made a second batch of ice
Flooding TXV
4. Ice not filling completely Replace thermistor Poor water flow
before going into harvest
5. No ice Replace thermistor Water cavitation
Premature harvest
Ice freezing to evaporator
6. Premature harvest with Replace thermistor Pump cavitation
no water flow or harvest
7. Thick ice at the bottom with Replace thermistor Conintuous syphoning of water from
thin ice at the top of the slab machine
8. Thick ice on bottom of Replace thermistor Starving expansion valve
evaporator with no ice on Flooding expansion valve
the top
9. Very thick ice bridge Replace thermistor Dirty condenser
Low refrigerant charge
10. Will not harvest ice Replace thermistor Dirty condenser
11.Will not go into harvest Replace thermistor Hall/proximity switch out of alignment
12. Will not go into harvest Replace thermistor Water dripping into bin
Ambient air entering into bin