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Bob Minchin[_4_]

wrote:
I've seen it suggested that the Suprima gas valve has two coils but I can't find any detail on how it works.

I wondered if one is for start and one for run?

Our boiler is lighting, but then immediately dropping out - as if it's not detecting a flame. However once it's running it's fine until it reaches temp. If there was an intermittant flame detection issue I'd expect the drop-outs to be much more random.

Any thoughts welcome.

Assuming this is a fairly modern modulating boiler, one coil is
notionally Start and the other is for modulation of the gas flow to turn
the wick up and down.