Scotsman MDT6N90 Service Manual download pdf (Page 20)

MDT6N90

May 2001

Page 20

SERVICE DIAGNOSIS

Symptom Possible Cause Probable Correction

No ice is made, nothing operates Unit off due to no power Restore Power

Unit off due to master switch in

OFF position.

Switch master switch to ON.

Unit off due to low water level. Check water supply, filter, float

valve. Correct water supply.

Unit off due to ice level sensors

(photo-electric eyes) blocked.

Check/clean ice level sensors.

Unit off due to scale on water level

sensor.

Clean water level sensor.

Unit off due to high pressure

control open.

Check for water interruption (water

cooled) or fan motor failure (air

cooled).

Auger motor hums but does not

turn.

Auger can’t turn.

No power to circuit board. Check harness

HI pressure cut out open

Circuit Board gear motor relay will

not close

Check, replace board

Water level or ice level sensor

failed.

Check, replace sensor

No ice, auger motor is turning Compressor contactor coil is open Check/replace contactor

Compressor will not start Check start capacitor.

Check start relay

Check compressor windings

Circuit board compressor relay will

not close.

Check, replace board

Unit makes ice, but very slowly. High discharge pressure because

of a dirty condenser

Clean the condenser.

Low capacity because the auger

and evaporator are coated with

mineral scale

Clean the water system

Low suction pressure due to low

refrigerant charge

Locate leak. Recover refrigerant,

repair leak, replace dryer,

evacuate and weigh in the

nameplate charge

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Scotsman MDT6N90 Service Manual Page 20

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