ITV ICE MAKERS NG 120, Technical Manual

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7 USER TROUBLESHOOTING GUIDE
7.1. GENERAL QUESTIONS
PROBLEM POSSIBLE CAUSES SOLUTION
None of the electrics work.
Front switch ON but pilot is
OFF
The machine is not plugged in.
Plug the machine and verify
socket power
None of the electrics work.
Front pilot is ON
Full bin status (LE4 on) with no ice.
Faulty or bad adjusted thermostat
Adjust / replace
PCB alarm. Check led code
PCB alarms. See point 4.2
High pressure switch
Dirty condenser Clean condenser
Defective fan Check. Replace
Defective safety / cooling switch Check. Replace
NTC probe error
Defective probe Check. Replace
Defective probe plug connection Check
Ice cycle timeout No frozen evaporator Check refrigeration system
NTC probe faulty contact Check probe fitting
Harvest cycle timeout
Faulty hot gas valve/coil Check. Replace
Harvest do not happen Check water inlet strainer
Wrong cycle sequence Dip-switch 2-4 OFF Set ON
White and partially formed
cubes. Not uniform nozzles
spray
Dirty nozzles Clean / replace
Dirty suction filter Clean
Lack of water at cycle´s end
Check water leaks
Check water inlet strainer
No water at nozzles
No water input
Check supply and water valve
operation
Faulty pump Check / replace
Overflow pipe out of place or leaking Check tube and o-ring
Too large cubes
Freezing time too large Adjust by dip-switches
Probe makes bad contact Position well
Too small
cubes
Uniform
Freezing time too short Adjust by dip-switches
Low refrigeration performance
Check refrigeration system
Not Uniform Poor refrigerator performance
Not all cubes are released
Harvest time too short Adjust by dip-switches
Freezing time too large (Ice slab) Adjust by dip-switches
Faulty hot gas valve Check / replace
Lack of water input
Check net pressure and input
filters
Faulty fan pressostat (non stop) Check / replace
Low ice production
Blocked condenser or air access to
condenser Clean condenser; improve air
circulation
Faulty hot gas valve, doesn’t close totaly. Replace
Low performance refrigeration system
Check
All the electrics work except
compressor.
Faulty contact. Check wiring.
Faulty relay . Replace relay.
Faulty “Klixon”.
Replace Klixon.
Faulty compressor. Replace compressor.
All the electrics work but the
compressor “klixons” (cycles
intermitenttly).
Voltage too low. Check voltage.
Obstruction in air circulation.
Move machine to a correct
position.
Start / run capacitor faulty. Replace condenser.
Cooling presostat faulty or wrongly
adjusted.
Replace or adjust presostat.