Scotsman Ice MDT5N40, MDT5N25 Service Diagnosis, Symptom Possible Cause Probable Correction

MDT5N25 & MDT5N40

SERVICE DIAGNOSIS

Symptom	Possible Cause	Probable Correction
No ice made, nothing operates	Unit off due to no power	Restore power
	Unit off due to master switch in	Switch master switch to ON
	OFF position
	Unit off due to low water level	Check water supply, filter, strainer,
		float valve. Correct water supply
	Unit off due to ice level sensors	Check/clean ice level sensors
	(photo-electric eyes) blocked
	Unit off due to scale on water level	Clean water level sensor
	sensor
	Unit off due to water temperature	Thermistor will shut down unit at
	too high	temperatures over 110oF.
Unit operates, no ice is vended	Check for ice in the bin	If no ice, check that ice maker can
		make ice
		Check that machine cannot keep
		up with needs
	Check for jam up of ice in	Pull chute down and allow ice to
	dispense chute	fall out. Return chute to its normal
		place.
	If there is ice, check that the bin	Check for power to the bin drive
	vane rotates. if not	motor, if none, check condition of
		Touch-Free ice sensor.
	If there is power to the bin drive	Disconnect electrical power,
	motor, but the vane does not turn	remove all ice, check mechanical
		condition of ice vane. Replace if
		broken.
		If ice vane is mechanically sound,
		check bin drive, replace if broken.
Compressor on, auger motor is off	Auger motor windings open	Replace auger motor
	Auger motor relay does not make	Replace circuit board
	Contactor stuck	Replace contactor
Compressor does not operate	Off due to high pressure control	Check condenser, fan motor, fan
	open	blade, or water supply on water
		cooled.
	Contactor coil is open	Replace contactor
	Contactor contacts do not make	Replace contactor
	Start capacitor failed	Replace start capacitor
	Potential relay failed	Replace relay
	Compressor windings open	Replace compressor
	Compressor locked	Replace compressor

May 2001

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