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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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