Scotsman CME1202 - Manual (Page 25)

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
Page 25