Service Diagnosis
Problem
Likely Cause
Probable Solution
Shut down on maximum
harvest time
Ice bridge thickness too small, not
enough ice to open curtain
Check and adjust if needed
Ice bridge thickness too large, ice
frozen to evaporator frame
Check and adjust if needed
Purge valve does not open, water
melts ice bridge, not enough ice to
open curtain
Check purge valve
Incomplete ice formation
Check water distributor for partially
plugged holes
Curtain out of position
Check curtain for swing restriction
Curtain switch does not open when
curtain does
Check switch with ohmmeter
Machine in very cold ambient
Move machine to a warmer
location
Hot gas valve does not open
Check hot gas valve, check
controller using test mode
Harvest assist probe out of position
– ejector pin not retracted
Check harvest assist mechanism –
spring should retract pin
Damaged evaporator
Check evaporator surface
Fan motor stays on during harvest
Check controller using test mode
Shut down on minimum
freeze time
Grounded ice thickness sensor
Check sensor for dirt and position.
Clean and check gap to evaporator
surface.
Water flow incorrect near sensor
Check water distributor for proper
assembly, attachment and for
scale build up. Correct as needed.
May 2008
Page 30
CU1526, CU2026, CU3030
Service Manual
