NUVE OT 020 Service Manual page 13

Bench top steam sterilizers
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FAILURE
8
The error message "H04" The endings of the temperature
appears on the display.
9
The error message "H06"
appears on the display.
10 The error message "H07"
appears on the display.
PROBABLE CAUSES
sensor are connected in reverse. correctly.
Water cannot be filled into the
sterilizator chamber.
The SSR terminal of the main
PCB does not outlet.
The SSR does not outlet.
The heater is defective.
The safety thermostat does not
outlet for heating.
Connect the endings to the main PCB
Check the water pump, water charge solenoid
valve, check valve and filter. Replace the
defective one.
Check the SSR terminal outlet with a multimeter.
If there is no outlet (12 VCD), replace the main
PCB.
Check the SSR terminals. Replace them
if there is no electricity pass.
Check the resistance values of the heater with a
multimeter. If the heater is defective, replace it.
Check with a multimeter whether the safety
thermostat terminals are short-circuit. If there is
no short-circuit, replace the safety thermostat.
12
SOLUTION

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