Manitowoc Ice S1800 service manual Diagnosing ICE Thickness Control Circuitry

Section 6 Electrical System

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 ICE/OFF/CLEAN switch to OFF and back to ICE. Step 2 Wait until the water starts to flow over the evaporator (freeze cycle).

Step 3 Disconnect the ice thickness control from the control board, then connect a jumper wire from the control board to any cabinet ground and monitor the harvest light.

Monitoring of Harvest Light	Correction
The harvest light comes on, and 10 seconds later, ice machine	The ice thickness probe is causing the malfunction.
cycles from freeze to harvest.
The harvest light comes on but the ice machine stays in the	The control circuitry is functioning properly. The ice machine is
freeze sequence.	in a six-minute freeze time lock-in (verify step 1 of this
	procedure was followed correctly).
The harvest light does not come on.	The control board is causing the malfunction.

HARVEST LIGHT

ICE THICKNESS

PROBE CONNECTION

Ice Machine Cycles Into Harvest Before Water Contact With The Ice Thickness Probe

Step 1 Disconnect the ice thickness probe from the control board.

Step 2 Wait until water starts to flow over the evaporator, then monitor the harvest light:

Monitoring of Harvest Light	Correction
The harvest light stays off and the ice machine remains in the	The ice thickness probe is causing the malfunction.
freeze sequence.	Verify that the Ice Thickness probe is adjusted correctly.
The harvest light comes on, and 10 seconds later, the ice	The control board is causing the malfunction.
machine cycles from freeze to harvest.

Part Number 80-1634-3 6-23