Service Diagnosis - Scotsman CU1526 Service Manual

CU1526, CU2026, CU3030
Service Manual

Service Diagnosis

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