Manitowoc Ice Machine IB0894YC

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

Check if pressure exceeds cut-in and contacts are open

Preparation and Safety Precautions

Ensure all ice produced during cleaning and sanitizing is discarded.

Wear rubber gloves and safety goggles (and/or face shield) when handling Ice Machine Cleaner or Sanitizer.

Open the front door to access the evaporator compartment and ensure no ice is on the evaporator.

Remove all ice from the bin/dispenser.

Press the clean switch and wait for the water trough to refill.

Add the proper amount of ice machine cleaner when the display indicates add solution.

Wait until the clean cycle is complete (approximately 24 minutes) and disconnect power to the ice machine.

Disconnect power to the ice machine

Follow all manufacturer’s instructions supplied with the pinch-off tool

Position the pinch-off tool around the tubing as far from the pressure control as feasible

Clamp down on the tubing until the pinch-off is complete

Cut the tubing of the defective component with a small tubing cutter

Solder the replacement component in place

Disconnect thermistor from control board

Measure resistance of the thermistor

Measure temperature at the thermistor

Resistance/Temperature Comparison

Enter measured resistance and temperature readings

Compare readings to resistance/temperature relationship chart

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