Scotsman CMS1402 - Manual (Page 21)

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 set on partial 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
CMS1402
September 1993
Page 21