Saunier Duval 47-920-36 Instructions For Use Installation And Servicing page 41

FAULT: THE BURNER DOES NOT LIGHT AT ALL, BUT THERE IS AN IGNITION SPARK.
Are the gas taps on?
Is there 24Vdc at the gas control valve?
for testing see component testing data.
Test the gas control valve.
Check resistance of safety valve coil.
FAULT: THE ROOM TEMPERATURE IS INADEQUATE AND RADIATORS ARE LUKE-WARM.
Is the room thermostat and or radiator
set high enough and calling for duty?
Turn up settings
18 Fault Finding
F1 FAULT DISPLAYED
YES
YES
NO
Is the heating power adequate ?
- Check set point P3. (Refer to Commissioning)
- Check dip switch setting. (Refer to Commissioning)
- Check the adjustment of the by-pass internal and
external (If fitted). - F30E/F35E Only Check the 3-way valve
is not passing into the domestic hot water heat exchanger.
NO
Turn on the gas taps.
Check the wiring.
NO
If the problem persists, change the
control board (PCB).
YES Is the heating temperature on the boiler
set high enough?
YES
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