Service Diagnosis - Scotsman MCM1462 Service Manual

MCM1462
SERVICE DIAGNOSIS: Electrical and/or Adjustments
SYMPTOM
Nothing operates
Makes thick ice/freezes up
Runs, makes no ice
Long freeze cycle
Cubes too small
Cubes too large
POSSIBLE CAUSE
Bin level control holding machine off
No Power
High pressure control open
High temperature cut out open
P. C. Board Open
Master switch open
Timer contacts open
Harvest cycle too short
Water inlet valve restricted
Low water pressure
Hot gas valve defective
Low refrigerant charge
Air intake temperature too high (air
cooled)
Sump covers out of position
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
Low refrigerant charge
Timer stuck
Relay does not energize; unit stuck in
harvest
Water inlet valve leaks through
Dirty condenser
Air intake temp. too high
Water temperature too high
Cube size set wrong
Cubes size control stuck closed
Water inlet valve leaks through
April, 1993
Page 20
PROBABLE FIX
Bin is full - use some ice.
Check ice level control circuit, see
page 22.
Reconnect power
Reset, check machine, check for
water interuption if water cooled.
Hot gas valve leaks thru, replace
Replace board
Test/replace
Replace timer
Adjust timer
Clean or replace valve
Check water filter or supply
Replace hot gas valve
Locate leak, repair, replace drier,
evacuate and weigh in nameplate
charge.
Reduce room temperature
Re-position sump covers
Adjust cube size
Replace cube size control
Check water system and pump
Replace inlet water valve
Locate leak, repair, replace drier,
evacuate and weigh in nameplate
charge.
Replace timer
Replace relay
Replace inlet water valve
Clean condenser
Reduce room temperature
Advise user
adjust cube size
Replace cube size control
Replace inlet water valve and adjust
cube size control