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, 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
Purge system, evacuate and weigh in
nameplate charge
Poor air circulation or extreme hot
location
Relocate the cabinet; or provide
ventilation
Overcharge of refrigerant
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 transducerand shake screen
dry.
Control not set on full
Set control to full.
Unit does not shut off
Ice level control failiure
Check circuit, see next page.
Timer stuck; does not turn
Replace timer
MCM1462
April, 1993
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