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4000123924-2
F30E/F35E ONLY
18 Fault Finding
FAULT: NO HEATING
Are the external heating
controls calling for heat?
Is the polarity correct?
Rectify fault on external controls.
NO
Rectify, check the 230V
controls board.
NO
Faulty main PCB.
NO
YES
Connect 1 and 2 on J10,
does boiler fire in central heating?
YES
Faulty 230V controls board.
YES
FAULT: NO HOT WATER, BUT THE HEATING IS WORKING
Is the water pressure greater
than 0.5 bar ?
NO
Insufficient water pressure.
The appliance will not operate.
Find out why the pressure is so low.
Is the water flow rate greater
than 1.7l/min. (threshold figure).
NO
Check the cold water inlet filter
for dirt. Is the cold water tap fully open ?
Check the heat exchanger for scaling.
YES
Is flow detector operating ?
NO
Change or clean it.
YES
Check the connectors on the
flow sensor and the control board (PCB).
If the fault persists, fit a relplacement
control board (PCB).
YES
Содержание 41-920-45
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