Service diagnosis: refrigeration and/or mechanical – Scotsman CME1202 User Manual
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SERVICE DIAGNOSIS: Refrigeration and/or Mechanical
SYMPTOM
POSSIBLE CAUSE
PROBABLE FIX
Poor harvest
Too short harvest time
Check and adjust harvest time
Restriction of incoming water
Check supply, filter, strainer and
valve
Hot gas valve does not open
Check for power to the coil, check
for not opening, replace
Not enough refrigerant
Locate leak, recover, repair,
replace drier, evacuate and weigh
in nameplate charge.
Cube size too small
Adjust with cube size control
Unit cycles off during freeze or
harvest
Hi temperature switch opens and
closes
Hot gas valve leaks thru, replace it
Loose connection on PC board
Check and replace P C board
Low capacity
High head pressure, from dirty
condenser, faulty fan motor, or
fan control
Clean condenser, repair fan
motor or control
Non condensable gas in the
system
Recover system, evacuate and
weigh in nameplate charge
Poor air circulation or extreme hot
location
Relocate the cabinet; or provide
ventilation
Overcharge of refrigerant
Recover, evacuate and weigh in
nameplate charge
Cube size too big, unit runs out of
water before harvest
Adjust cube size control
Inlet water valve leaks thru
Replace valve
Hot gas valve leaks thru
At the end of the freeze cycle
there should be frost on the
evaporator end of the hot gas
tubes, if not replace the hot gas
valve
Unit runs out of water
Reservoir leaks
Repair leak
Inlet water valve restricted
Clean or replace valve
Short harvest cycle
Adjust timer
Water pressure too low
Check supply
Unit shuts off before bin is full
Something blocking transducer
Remove blockage
Transducer is wet
Remove transducer and shake
screen dry.
Control set on partial
Set control to full.
Unit does not shut off
Ice level control failure
Check circuit, see next page.
Timer stuck; does not turn
Replace timer
CME1202 & CME1402
January 1995
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