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Problem
Motor stopped (thermal relay
operation signal)
Oil consumption high
Intake filter leaks oil
Safety valve opening
Sensor for compressor temperature
triggered
Compressor performance low
Compressor does not
compress air while running
Compressor compresses air
over max. pressure value
Compressor hardly starts
TROUBLESHOOTING
Cause
Voltage too low.
Overtemperature.
Drainage faulty.
Oil level too high.
Oil separator filter broken.
Oil separator filter seal leaking.
Intake regulator stays open.
Pressure too high.
Intake regulator does not close at
the end of the cycle.
Oil separator filter clogged.
Room temperature too high
Radiator clogged.
Oil level too low.
Electrical fan does not start.
Air filter dirty or clogged.
Regulator closed. It cannot open
because dirty.
Regulator closed. It cannot
open because no command is
received.
Regulator open. It cannot open
because dirty.
Regulator open. It cannot
open because no command is
received.
Oil separator filter clogged.
Min. pressure valve does not close
perfectly.
Voltage too low.
Tube leaking.
Remedy
Check voltage, press Reset and then restart.
Check motor absorption and relay setting. In case of
regular absorption press Reset and restart.
Check oil drain hose and check valve.
Check oil level and drain some, if necessary.
Replace oil separator filter.
Replace oil separator nipple seals.
Check regulator and solenoid valve.
Check the pressure setting.
Check regulator and solenoid valve.
Replace oil separator filter.
Improve ventilation.
Clean radiator with solvent.
Top up oil.
Check the electrical fan motor.
Clean or replace filter.
Remove intake filter and check for proper manual
opening. Remove and clean, if necessary.
Check for signal on solenoid valve. Replace damaged
part, if any.
Remove and clean regulator.
Check for signal availability between pressure switch and
solenoid valve. Replace damaged part, if any.
Replace oil separator filter.
Remove the valve, clean and replace seal, if
necessary.
Check mains voltage.
Tighten fittings.
NOBEL DV 30-37 CSA - Cod.197EE0612ML - Rev.2 09/2019
EN
29
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