Saunier Duval Themaclassic F30E SB Instructions For Use Installation And Servicing page 39

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