Scotsman MCM1062R - Manual (Page 24)

SERVICE DIAGNOSIS
SYMPTOM POSSIBLE CAUSE PROBABLE CORRECTION
Low ice production 3. High head pressure, a result of a
dirty condenser 3. Clean condenser, check fan
motor
4. Hot gas valve leaks thru 4. Replace hot gas valve
5. High air temp. for condenser. 5. If possible, reduce condenser air
inlet temperature.
No ice falling in bin, unit frozen up 1. Cube size control will not close 1. Check temp. of suction line, cube
size control will not close if temp.
too high. If temp. low enough,
replace cube size control
2. Timer motor open 2. Replace timer
3. Plug in relay contacts open 3. Replace relay
4. Not enough time during the
harvest cycle to drop all ice 4. Adjust timer for more harvest time
5. Cube size wrong 5. Adjust cube size
6. Hot gas valve restricted. 6. Replace hot gas valve.
7. Not enough water to help harvest. 7. Check for restriction of water
supply.
8. Head pressure too low 8. Check pressure control valve.
Check for low refrigerant charge.
Ice maker stuck in harvest cycle 1. Relay coil open 1. Replace relay
2. Timer stuck in harvest cycle 2. Check for power to timer motor, if
power replace timer, if no power to
timer motor, replace relay.
3. Timer microswitch N.O. contacts
will not close. 3. Replace timer.
Ice is mal-formed 1. Shortage of water 1. Check for restriction of water
supply. Check for leak.
2. Evaporator water passages
restricted. 2. Clean ice maker.
3. Cube size set wrong 3. Adjust cube size control
Water overflows from reservoir into
bin. 1. Restricted sump drain 1. Repair drain
2. Inlet water valve lets in too much
water 2. Replace valve
MCM1062R
October 1993
Page 24