Scotsman CME456 Handbuch PDF herunterladen (Seite 32)

Service Diagnosis

CME306 & CME456

January 2000

Page 32

Problem or Symptom Possible Cause Probable Correction

Unit is off because of a

“Harvest Problem”

Ice sensors did not sense

ice falling, unit stayed in

harvest until the maximum

harvest time ran out.

Check ice sensors. The bin full light should be

off. If it is on or blinking the bin controls may

be dirty. Clean if dirty. The board and bin

controls may also need to be checked.

Push and release Off button. Push and

release Freeze button. Check machine

operation. Check if ice is made and harvests.

Ice sensors or Controller

may have failed.

See “Unit does not shut off” below.

Other components may

have failed

Check the next page

Cubes are too large Cube size control float is

sticking.

Check/clean

Inlet water valve leaks thru Check water valve

Cubes are too small Purge valve leaks thru Check purge valve

Not enough water Check for leak in reservoir

Low ice capacity Dirty condenser or filter Replace filters, clean condenser

Recirculation of air Block air re-circulation or move condenser

Low refrigerant charge Check system. If there is a low charge, find

the leak, recover the refrigerant, repair the

leak, replace the dryer, evacuate and weigh in

the nameplate charge.

Too much water Check for inlet water valve leak thru

Unit does not shut off

or cannot sense ice

falling

Ice sensor system may

have failed.

Check ice sensors. Check bin full light, if off,

place something between the electric eyes.

The bin full light should begin to blink (after 20

seconds of continuous blockage it will glow

steadily). If not, check operation of electric

eyes by unplugging #4 and jumping out the

two pins on the controller (first discharge any

static electricity by touching the cabinet with

the tool). If the bin full light blinks, replace the

bin controls. If it does not blink, replace the

controller. Note: Leaving #4 unplugged and

jumped for 20 seconds will shut the machine

down on a bin full (at the end of the harvest

cycle). It will restart after 4 minutes or may be

reset by pushing the Freeze button.

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