Manitowoc Ice Machine ICVD0695

Verify fan motor windings are not open or grounded

Connect manifold gauges to ice machine

Hook voltmeter in parallel across the fan cycle control, leaving wires attached

Perform keystrokes on the display

Press Menu, scroll down to Service and press the right arrow

Scroll down to Diagnostics, press the right arrow and select Diagnostics

Display reads Control Board, press right arrow

Scroll down to enbl relays and press right arrow to start control board test

Verify control board relays are energized

Test for line voltage at the individual components

Line voltage is present and the component is non-functional

Cycle ice machine with the on/off button

Run the system to see if the control trips at the rated pressure

Enter the pressure at which HPCO opens

Is the HPCO opening at a pressure significantly lower or higher than 450 psig?

If the control opens at the correct pressure, find the root cause

Leave all wiring connectors attached and perform testing within the 60 minute time delay period

Check for 24 volts at terminals V & C on the ice machine control board

Verify bin switch, curtain/damper, and curtain/damper magnet are in place

Scroll down to Service and press right arrow

Scroll down to Diagnostics and press right arrow

Scroll down to Inputs and press right arrow to display curtain switch readings (Curt SW1, Curt SW2, etc)

Open and close the ice damper(s) repeatedly while observing the display and control board lights

Curtain switch cycles open/closed and control board light energizes/de-energizes

Disconnect bin switch wire from control board

Navigate to LPCO input on display

Scroll down to Service and press right arrow

Scroll down to Diagnostics and press right arrow

Scroll down to Inputs and press right arrow to display LPCO reading

Connect manifold gauges and verify refrigerant pressure exceeds LPCO cut-in

Does the pressure exceed LPCO cut-in?

If pressure exceeds cut-in and the contacts are open, replace the LPCO