Scotsman CME1000A User Manual page 22

CME855A & CME1000A
SERVICE DIAGNOSIS
SYMPTOM
Low ice production
No ice falling in bin, unit frozen up 1. Cube size control will not close
Ice maker stuck in harvest cycle
Ice is mal-formed
Water overflows from reservoir
into bin.
POSSIBLE CAUSE
4. High head pressure, a result of
a dirty condenser
5. Hot gas valve leaks thru
6. High discharge pressure
2. Timer motor open
3. Plug in relay contacts open
4. Not enough time during the
harvest cycle to drop all ice
5. Cube size wrong
6. Hot gas valve restricted.
7. Not enough water to help
harvest.
8. Head pressure too low
1. Relay coil open
2. Timer stuck in harvest cycle
3. Timer microswitch N.O.
contacts will not close.
1. Shortage of water
2. Evaporator water passages
restricted.
3. Cube size set wrong
1. Restricted sump drain
2. Inlet water valve lets in too
much water
December, 1994
Page 22
PROBABLE CORRECTION
4. Clean water circuit of
condenser
5. Replace hot gas valve
6. If possible, reduce condenser
water inlet temperature.
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. Replace timer
3. Replace relay
4. Adjust timer for more harvest
time
5. Adjust cube size
6. Replace hot gas valve.
7. Check for restriction of water
supply.
8. Check water reg./pressure
control valve. Check for low
refrigerant charge.
1. Replace relay
2. Check for power to timer
motor, if power replace timer, if
no power to timer motor, replace
relay.
3. Replace timer.
1. Check for restriction of water
supply. Check for leak.
2. Clean ice maker.
3. Adjust cube size control
1. Repair drain
2. Replace valve