NUVE OT 020, Руководство по обслуживанию

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9
3.2. GENERAL FAILURES
FAILURE PROBABLE CAUSES SOLUTION
1 The on / off switch is ON Power supply inlet failure Check that mains voltage is supplied to the unit.
but it does not lighten,
the display is blank. Check that the terminal connections and power
supply socket connections are well connected.
The glass fuse is blown. Replace the glass fuse and check the short
circuit that causes the blowing of the fuse.
2 The on / off switch is ON The main PCB / display PCB Disconnect the connection cable and re-connect
and lightens but the connection cable is not it carefully.
display is blank or some well connected.
segments do not lighten.
The cable with socket is Replace the cable.
defective.
The display PCB is defective. Replace the display PCB.
The main PCB is defective. Replace the main PCB.
3 The on / off switch is The on / off switch cable Check the connections and correct them.
OFF but it lightens. connections are connected in
reverse.
4 The fuse blows frequently. Short circuit exists. Check the heater with a multimeter. If short-
circuit
exists, replace the heater.
Check all solenoid valve bobbins for short-circuit
with a multimeter. If short-circuit exits in any
bobbin, replace it.
Check the vacuum pump
♣
and water pump for
short-circuit. If there is short-circuit, replace that
pump.
Check all other electrical terminals and cables
for short-circuit.
5 The pressure in the The safety valve is open. Close the valve by turning it to the counter
sterilization chamber does clockwise direction.
not increase.
One of the steam charge, Take the capsule of the solenoid valve out and
condense or vacuum line solenoid
valves
♣
is open or defective.
clean the core of it. If you cannot solve the
problem replace the solenoid valve.
The heater is defective. Check the heater. Replace it if it is defective.
The safety thermostat does not Check with a multimeter that there is short circuit
outlet for heating. in the safety thermostat terminals. If there is
no short-circuit, replace the safety thermostat.
♣
This feature is valid only for OT 020V.