Manitowoc QD0202A, Service Manual

Page: 107 / 175

Section 6 Electrical System
Part No. 80-1100-3
6-51
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.
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.
Figure 6-26. Step 2
Continued on next page …
Important
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.
Important
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.
Step 2 Jumper wire connected from probe to ground
Is water flowing into the
water trough?
The Water Level Light is:
The Water Inlet Valve
Solenoid Coil is:
Cause
no on De-Energized This is normal operation.
Do not change any parts.
yes on De-Energized The water inlet valve is
causing the problem.
yes off Energized Proceed to step 3.
SV1621a
CLEAN LIGHT
WATER LEVEL LIGHT
BIN SWITCH LIGHT
HARVEST/SAFETY LIMIT LIGHT
1C
1F
YELLOW
GR EE N
GR EE N
R ED
JUMP ER
GR O U N D