Manitowoc Ice Q130 manual Safety Limit #1, Before Calling for Service, Section

Before Calling for Service Section 5

Safety Limit #1

Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.

Possible Cause	Check/Correct
Improper installation	See “Installation Instructions” Section 2 of this manual
Water system	Low water pressure (20 psi minimum.)
	High water pressure (80 psi maximum.)
	High water temperature (90°F/32.2°C maximum.)
	Clogged water distribution tube
	Dirty/defective water float valve
	Loss of water from sump area
	Defective water pump
Electrical system	Ice thickness probe out of adjustment
	Harvest cycle not initiated electrically
	Compressor relay not energizing
	Compressor electrically non-operational
Restricted condenser air flow	High inlet air temperature (110°F/43.3°C maximum.)
(air-cooled models)	Condenser discharge air recirculation
	Dirty condenser filter
	Dirty condenser fins
	Defective fan cycling control
	Defective fan motor
Refrigeration system	Non-Manitowoc components
	Improper refrigerant charge
	Defective hot gas valve
	Defective compressor
	TXV starving or flooding (check insulation and bulb mounting)
	Non-condensables in refrigeration system
	Plugged or restricted high side refrigerant lines or component

Because there are many possible external problems,do not limit your diagnosis to only the items listed in these charts.

5-4 Part Number 000001130 12/08