Manitowoc Ice Machine IB1094YC-161

Press the power button to start an ice making cycle

Remove water curtain or splash guard if present

Remove the ice thickness probe, rotate and remount with the nipple facing away from the evaporator

Navigate to 'Ice Sense' in the menu

Wait until 6.5 minutes into the freeze cycle

Scratch the ice thickness probe nipple for approximately 30 seconds

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

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

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

Check that the machine is off and the display indicates 'Delay xx min, HPCO Active'

Cycle ice machine with the on/off button

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

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 (Fan motor, dirty condenser, refrigeration system issue, etc.)

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

Is the water inlet valve completely stopping water flow when the ice machine is off?

Is the water inlet valve allowing proper water flow when the ice machine is on?

Refer to 'Water System Checklist' if water flow is not as expected.