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