Scotsman CME855A - Manual (Page 22)

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
CME855A & CME1000A
December, 1994
Page 22