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Ok, thanks for your help.

no, I can't see or hear any spark.

The water pressure has been dropping regularly over the last few months but I have been opening the tap underneath the boiler to top it up. I presume the gas is on - it certainly was when it stopped working. I'll check tonight. Thanks for your help!

No it's not a permanent pilot. When I open the tap, the fan goes on, a relay clicks but the pilot doesn't light then after a couple of seconds the red light comes on the board.

Hi, When I turn on the hot tap there's a red light on the modulator board. I followed the diagnostic flowchart which says either change the DHW flow switch or the frost thermostat. I changed both but it's still the same. Any ideas? Thanks!