Diagnostic Charts; No Ice Production - Hoshizaki KML-631MAH Service Manual

unit remains in freeze with the float switch removed, replace the board.
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and
conditions. Cycle times and pressures should follow performance data provided
in this manual.
6) Pump-Out Cycle (10/20 second pump out) – The compressor remains energized, the
hot gas valve energizes, and the fan motor de-energizes. The pump relay and pump
motor de-energize for 2 seconds. The service relay and pump relay energize, restarting
the pump motor and taking water from the sump and forcing it to go through the drain
valve and down the drain for 10/20 seconds. This removes contaminants from the water
reservoir. Diagnosis: If the pump motor does not run, check the circuit, service relay,
pump relay, and capacitor. Check for proper voltage. If water does not pump out, check
and clean the tubing at the drain valve and then check and clean the valve assembly.
7) Normal Harvest Cycle – same as the initial harvest cycle – Return to step 4.
Note: Unit continues to cycle until bin control is satisfied or power is switched OFF. (The
pump out cycle can be adjusted to occur every cycle, or every 2, 5, or 10 cycles.
The factory default is every 10 cycles.) The unit always restarts at the 1 minute fill
cycle.
B. Diagnostic Charts

1. No Ice Production

Problem
[1] The icemaker will not
start.
Possible Cause
a) Power Supply
b) Fuse (Inside fused
disconnect, if any)
c) Control Switch
d) Bin Control Thermostat 1. Tripped with bin filled
e) High Pressure Control 1. Bad contacts.
1. OFF position.
2. Loose connection.
3. Bad contacts.
4. Voltage too high or too
low.
1. Blown.
1. OFF position.
2. Bad contacts.
with ice.
2. Ambient temperature
too cool.
3. Set too warm.
4. Bulb out of position.
5. Bad contacts.
2. Dirty air filter or
condenser.
35
Remedy
1. Move to ON position.
2. Tighten.
3. Check for continuity and
replace.
4. Check and get
recommended voltage.
1. Check for short circuit and
replace.
1. Move to ICE position.
2. Check for continuity and
replace.
1. Remove ice.
2. Increase ambient
temperature.
3. See "II.E. Bin Control."
4. Place in position.
5. Check for continuity and
replace.
1. Check for continuity and
replace.
2. Clean.