Diagnosing Ice Thickness Control Circuitry - Manitowoc Q270 Technician's Handbook

DIAGNOSING ICE THICKNESS CONTROL
CIRCUITRY
Ice Machine Does Not Cycle Into Harvest when
Water Contacts the Ice Thickness Control Probe
Step 1 Bypass the freeze time lock-in feature by
moving the ON/OFF/WASH switch to OFF and back to
ON. Wait until the water starts to flow over the
evaporator.
Step 2 Clip the jumper wire to the ice thickness probe
and any cabinet ground.
ICE THICKNESS
PROBE
EVAPORATOR
Step 2 Jumper wire connected from probe to ground
Monitoring Harvest Light
The harvest light comes on,
and 6-10 seconds later, ice
machine cycles from freeze
to harvest.
The harvest light comes on
but the ice machine stays in
the freeze sequence.
The harvest light does not
come on.
48
GROUND
JUMPER WIRE
HARVEST LIGHT
(RED)
The ice thickness control
circuitry is functioning
properly. Do not change any
parts.
The ice control circuitry is
functioning properly. The ice
machine is in a six minute
freeze time lock-in. Verify
Step 1 of this procedure was
followed correctly.
Proceed to Step 3.
Part Number STH039 8/13
PROBE
CONNECTION
BIN SWITCH
LIGHT
(GREEN)
Correction
SV1592i