Service Diagnosis - Scotsman EH222 Quick Start Manual

EH222 and Condensing Unit
Remote Low Side Cuber Service Manual

Service Diagnosis

Problem or Symptom
No ice
No water to ice making section
Slow ice release during harvest
No ice sensed during harvest
No ice, Code 1 Displayed
No ice, Code 2 Displayed
No ice, Code 3 Displayed
No ice, Code 8 Displayed
Possible Cause
No refrigeration, unit shut down,
maximum freeze time code
displayed
Sump frozen
Water level sensor working
properly
Cubes are too large
Condenser by-pass valve does not
open
Ice sensing system failure
No ice released to bin
No ice released, vapor inlet valve
does not open
Freeze cycle too long
Harvest cycle too long
Water supply inadequate
Freeze cycle too short
April 2015
Page 40
Probable Correction
Check compressor, refrigerant
charge, and liquid inlet valve. Note
that if liquid inlet valve is not open,
compressor will pump down and
suction pressure will be very low.
Check for welded contactor
Clean or replace sensor
Check ice thickness sensor
Check for water leak
Check coil of valve
Check power to valve during
harvest
Check curtain switch
Ice outlet blocked - check for
obstruction
Check coil for continuity, if open
replace coil
Check for 24 volts to coil during
harvest, if none, check at relay in
EH222
Check low side pressure, if
pressure does not rise during
harvest, and valve is electrically
OK, replace vapor inlet valve
Check for false sump full indication
(See page 28)
Check condensing unit operation
Check refrigeration including head
pressure control valve, vapor
valve, bypass valve
Check water valve for leak thru
Check purge valve for leak thru
Check harvest assist
Check for false sump full
Check curtain switch
Check bypass and vapor valve
operation
Check water supply and inlet water
solenoid valve
Check / clean ice thickness sensor
Clean water system
Scrub evaporator spillway (See
page 26 & 27)