Manitowoc Ice QM45 Series service manual Before Calling for Service, Safety Limit Feature, Section

Before Calling for Service Section 5

Problem	Possible Cause
Ice machine produces shallow	Ice thickness probe is out of
or incomplete cubes, or the ice	adjustment.
fill pattern on the evaporator is	Water trough level is to high or too low.
incomplete.
	Water float valve filter screen is dirty.
	Water filtration is poor.
	Hot incoming water.
	Water float valve is not working.
	Incorrect incoming water pressure.
	Ice machine is not level.
Low ice capacity.	Water float valve filter screen is dirty.
	Incoming water supply is shut off.
	Water float valve stuck open or
	leaking.
	The condenser is dirty.
	High air temperature around ice
	machine (air-cooled models).
	Inadequate clearance in front of the
	ice machine.
	Objects stacked around ice machine,
	blocking airflow to condenser (air-
	cooled models).

To Correct

Adjust the ice thickness probe. See page 3-5.

Check the water level. See page 3-4.

Remove and clean the filter screen. See page 4-1.

Replace the filter.

Connect the ice machine to a cold water supply. See page 2-6. Remove the water float valve and clean it. See page 4-7.

Water pressure must be 20-80 psi (137.9 - 551.5 kPA).

Level the ice machine. See page 2-3.

Remove and clean the filter screen. See page 4-1.

Open the water supply valve. Remove the water float valve and clean it. See page 4-7.

Clean the condenser. See page 4-1. Air temperature must not exceed 110°F (43.3°C).

Provide adequate clearance. See page 2-2.

Remove items blocking airflow.

Safety Limit Feature

In addition to the standard safety controls, your Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure.

Before calling for service, re-start the ice machine using the following procedure:

1.Move the ON/OFF/ WASH switch to OFF and then back to ON.

A.If the safety limit feature has stopped the ice machine, it will restart after a short delay. Proceed to step 2.

B.If the ice machine does not restart, see “Ice machine does not operate” on the previous page.

2.Allow the ice machine to run to determine if the condition is reoccurring.

A.If the ice machine stops again, the condition has reoccurred. Call for service.

B.If the ice machine continues to run, the condition has corrected itself. Allow the ice machine to continue running.

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