34
DOMITOP HF 24 - 30 E
FERELLA GOLD HF 24 - 30 MEL
Version - 09.2002
4. Troubleshooting
Flow Diagram 1
Checking Electric Power Supply - System Pressure and Antifreeze Protection
Is LED5 on?
Turn the selector onto ON
Selector on
summer position " "
Are there 230V between
the terminals X1-1 X1-2?
Check and if necessary
change the 2A fuse
YES
Is LED5 on?
Repair the fault with
the external line
NO
NO
Change the
main card
NO
YES
Is LED5 blinking?
YES
Is the pressure
of the water not
between
1 and 1.5 bar?
YES
Take the pressure
to 1 - 1.5 bar
Check the
electrical connection
of the water
pressure switch
NO
Does the
burner ignite?
NO
Proceed with
diagram 2
NO
YES
Does the
circulator turn?
If the boiler temperature is
under 5°C the antifreeze
protection is active
NO
Check the
electrical connection
of the circulator
Disconnect the heating
temperature sensor
Is the burner out?
Check and if necessary
change the main card
NO
NO
YES
Check and if
necessary change
the water
pressure switch
First of all, check the following points
The gas cock is open
The electricity is on
The polarity is correct
The system pressure is between 1 and 1.5 bar
The pump turns correctly
YES
The relay RY 1
is closed
Check and if
necessary change
the circulator
Proceed with
diagram 2
YES
YES
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