Manitowoc Ice QM20 service manual Before Calling for Service, Section

Before Calling for Service		Section 5
		To Correct
Problem	Possible Cause
Ice machine produces	Water level is low.	Be sure the overflow tube is fully
shallow or incomplete cubes,		seated to prevent water leakage.
or the ice fill pattern on the		See page 4-5.
evaporator is incomplete.
	Water inlet valve filter screen is dirty.	Remove the water inlet valve and
		clean the filter screen. See page 4-
		6.
	Water filtration is poor.	Replace the filter.
	Hot incoming water.	Connect the ice machine to a cold
		water supply. See page 2-5.
	Ice thickness adjustment dial is not set	Adjust the ice thickness adjustment
	properly.	dial. See page 3-2.
	Incorrect incoming water pressure.	Water pressure must be 240-620 kPA
		(34.8 - 89.9 psi).
	Ice machine is not level.	Level the ice machine.
		See page 2-2.
Low ice capacity.	Water inlet valve filter screen is dirty.	Remove the water inlet valve and
		clean the filter screen. See page 4-
		6.
	Incoming water supply is shut off.	Open the water service valve.
	The air filter is dirty.	Clean the air filter. See page 4-1.
	The condenser is dirty.	Clean the condenser. See page 4-1.
	Inadequate airflow at the front of the	Remove items blocking airflow at
	ice machine.	the front of the ice machine.
	Ice thickness adjustment dial is not set	Adjust the ice thickness adjustment
	properly.	dial. See page 3-2.

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