Diagnosing Freeze Cycle Potable Water Level Control Circuitry - Manitowoc QR0320A Service Manual

Section 6
DIAGNOSING FREEZE CYCLE POTABLE WATER
LEVEL CONTROL CIRCUITRY
Problem: Water Trough Overfilling During The
Freeze Cycle
Step 1 Start a new freeze sequence by moving the ICE/
OFF/CLEAN toggle switch to OFF, then back to ICE.
This restart must be done prior to performing
diagnostic procedures. This assures the ice
machine is not in a freeze cycle water inlet valve
safety shut-off mode. You must complete the entire
diagnostic procedure within 6 minutes of starting.
GR O U N D
JUMP ER
Is water flowing into the
water trough?
no
yes
yes
Part No. 80-1100-3
Important
Step 2 Jumper wire connected from probe to ground
The Water Level Light is:
on
on
off
Step 2 Wait until the freeze cycle starts
(approximately 45 seconds, the freeze cycle starts when
the compressor energizes) then connect a jumper from
the water level probe to any cabinet ground.
For the test to work properly you must wait until the
freeze cycle starts, prior to connecting the jumper
wire. If you restart the test you must disconnect the
jumper wire, restart the ice machine, (step 1) and
then reinstall the jumper wire after the compressor
starts.
1C
1F
Figure 6-26. Step 2
The Water Inlet Valve
Solenoid Coil is:
De-Energized
De-Energized
Energized
Electrical System
Important
CLEAN LIGHT
YELLOW
GR EE N
WATER LEVEL LIGHT
GR EE N
BIN SWITCH LIGHT
R ED
HARVEST/SAFETY LIMIT LIGHT
Cause
This is normal operation.
Do not change any parts.
The water inlet valve is
causing the problem.
Proceed to step 3.
Continued on next page ...
SV1621a
6-51