Manitowoc Ice QF0400 manual Analyzing Why SafeGuards May Stop the Ice Machine, No Water Checklist

Section 5 Before Calling Service

Analyzing Why SafeGuards May Stop the Ice Machine

According to the refrigeration industry, a high percentage of compressor failure are the result of external causes. These can include flooding or starving expansion valves, dirty condensers, water loss to the ice machine, etc. SafeGuards protect the ice machine (primarily the compressor) from external failures by stopping ice machine operation before major component damage occurs.

Refrigeration and electrical component failures may also trip a safeguard. Eliminate all electrical components and external causes first. If it appears that the refrigeration system is causing the problem, use the charts, checklists, and other references to determine the cause.

NOTE: The following checklists are designed to assist the service technician in analysis. However, because there are many possible external problems, do not limit your diagnosis to only the items listed.

No Water Checklist

SAFEGUARD MODES

No Water

During the Freeze cycle if the water level probe opens or remains open for more than 30* continuous seconds, the ice machine will de-energize the compressor and gear motor, continuously flash the water level light and initiate a 60 minute Standby Mode.

During the Standby Mode the water level light will continually flash to indicate a Standby Mode.

After the 60 -minute Standby Mode, the ice machine will de-energize the water level light and initiate a start-up sequence.

WATER CONTACTS THE WATER LEVEL PROBE:

The ice machine continues to make ice.

WATER LEVEL PROBE OPENS OR REMAINS OPEN FOR MORE THAN 90 CONTINUOUS SECONDS:

The ice machine will start another 60-minute Standby Mode.

The ice machine repeats the above sequence until: Water contacts the water level probe

or

The toggle switch is moved to the OFF position.

*Note: There are two control boards, early version boards must remain open for 90 seconds before de- energizing.

INDICATOR LIGHT

Before 48 hours have elapsed:

After a Standby Mode has been initiated the water level light will flash anytime the toggle switch is placed in the OFF position.

After 48 hours have elapsed:

The SafeGuard will be automatically erased from memory and the water level will not flash.

Possible Problem List	Corrective Action List
No water	Restore water supply.
Quick disconnect removed from water float valve	Restore water supply.
Water float valve screen blocked	Clean screen.
Water float valve solenoid coil defective	Replace coil (see Water float valve diagnostics).
Water float valve improperly adjusted	Adjust valve (see Water level check).
Dump valve leaking	Repair or replace dump valve.
Water level probes disconnected or removed	Connect and correctly position probes.

Part Number 000002688 5-3