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4000123942-2
16 Fault Finding
FAULT: NO HOT WATER, BUT THE HEATING IS WORKING
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.
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
11800
24ci ONLY
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
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