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Thanks for that. Could I leave the old switch in, cut the wires and bypass the board?

But it isn't! The low pressure LED's flashing but water pressure is steady at one bar. No CH or hot water. Is there a pressure switch somewhere?

I'll give space to the experts. I'm thinking pump's not up to it, even boiler.

Hmmm, did it ever work okay?

Think the other rads need to be turned down. Turn hottest down a turn, then next hottest and so on. When you get close, eg your cold rad's warming up, adjust 1/2 to 1/4. This is an oversimplification of balancing, but it'll get you in the right direction.

Are you bored?

Full of air?

Good spot, above, and 'Eco' is the factory default setting.

I'm no plumber but I guess the experts will want to know the model of boiler and whether it has pressure. Can you take a couple of pics and post?

For the archive, the thermistor fixed the issue. If the DHW LED flashes once per second (rather than twice), it's the PCB, says Grant.

Many thanks. I have a thermistor on its way so will try first. If it still messes I'll look at the board.

Teeny update. Checked connection at PCB and at store and it worked for a short time, so new thermistor ordered. However, where it sits seems full of muck, which I can probably clean with a cotton bud or similar. Is this normal? And I take it the circlip just holds the wire and nothing else!

DHW LED flashing couple of times a second. Grant's docs suggest the ‘Store’ thermistor connection to PCB, or possible store thermistor. Any thoughts?

Here

Had the same issue and bought from Aliexpress. Hope you're not in a hurry...

Further to above, towel rails are fab for adding inhibitor!

Notes

I've no idea, sorry, but I suspect folks will ask for appliance details.

Council tip, maybe, but you'd better be quick!

The pump runs but is cold and the burner fires and boiler doesn't overheat? Hmmm... Maybe one of the valves is shut or partially shut?