SERVICE DIAGNOSIS
SYMPTOM
POSSIBLE CAUSE
PROBABLE CORRECTION
Low ice production
4. High head pressure, a result of a
dirty condenser
4. Clean water circuit of condenser
5. Hot gas valve leaks thru
5. Replace hot gas valve
6. High discharge pressure
6. If possible, reduce condenser
water 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 water reg./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
MCM1062W
September 1993
Page 18
