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CME650R
SERVICE DIAGNOSIS: Electrical and/or Adjustments
SYMPTOM
Machine does not operate
Makes thick ice/freezes up
Runs, makes no ice
Long freeze cycle
Cubes too small
Cubes too large
Compressor cycles on and off on
pump down control
Compressor will not run
Unit cycles on and off anytime in
any cycle
POSSIBLE CAUSE
No power
High pressure control open
High temperature cut out open
P. C. Board Open
Master switch open
Timer contacts open
Bin thermostat holding machine
off
Harvest Cycle too short
Low water pressure
Hot gas valve defective
Cubes too small
Cube size control stuck open
Pump problem or water leak in
reservoir
Water inlet valve either lets in no
water or leaks through
Timer stuck
Relay does not energize; unit
stuck in harvest
Water inlet valve leaks through
Water temperature too high
Cube size set wrong
Cubes size control stuck closed
Water inlet valve leaks through
Low refrigerant charge
Liquid line valve or drier restricted Check and replace
TXV restricted
Head pressure control valve not
working (low condensing temp.)
Low pressure control will not close Check pump down control for
Contactor coil open
Compressor windings open
Loose connection in PC board
March 1994
Page 24
PROBABLE FIX
Reconnect power
Reset, check machine
Hot gas valve leaks thru, replace
Replace board
Test/replace
Replace timer
Test thermostat, replace if
contacts stuck open.
Adjust timer
Check water filter or supply
Check inlet water valve screen
and flow control.
Replace hot gas valve
Adjust cube size
Replace cube size control
Check water system and pump
Replace inlet water valve
Replace timer
Replace relay
Replace inlet water valve
Advise user
Adjust cube size
Replace cube size control
Replace inlet water valve and
adjust cube size control
Locate leak, repair, replace drier,
evacuate and weigh in nameplate
charge.
Check and replace
Check/replace head pressure
control valve
proper operation
Check/replace contactor
Check replace compressor
Replace PC board
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