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Thanks - appreciate the feedback - as I said earlier in the thread: >>The sound is like a rattling chain every time it shuts the pump - but not when it restarts. I've listened to the diverter and pump - it doesn't seem to be from here - but I can here the noise through the radiators. Any idea...

Thanks Chris, I'm not certain the boiler did stay on longer. I wouldn't know. I'm not sure the pump is the cause because it was the pump that stayed on all day every day before the new board - but if Baxi-Potterton are to be believed, should have stopped/started, and the behaviour only...

Thanks. It's always rattled. Perhaps it sounds more like a few pebbles - but it's a concistant sound. It just use to do it once a day. Now it does it 15 to 20 times an hour.

Many thanks that was a great suggestion. The engineer at Baxi-Potterton said that this is normal, but also said it should have happened with the original PCB as well, which it didn't. As this is normal he said the ratlling noise isn't normal, but couldn't say what it was other than "it...

I have called the engineer back. He is back on Thursday. It's not beyond the bounds of possibility that he'll say he fitted it correctly when he hasn't - hence my question here. Thanks. Jeff +++++++++++++++++++++++++++++++++++++++++++ lor wrote: Meldrews mate , Suprima L onwards...

I'm hoping that by being more specific about my dear Optima, a kind expert on this Optima 50 might take pity on me and be able to shed light on this issue as the heating engineers seem perplexed! Essentially what is happening is that the latest PCB has been fitted. What use to happen was...

......... cheeky I know but just nudging this back up in case someone can help!

I've just had the PCB replaced on my Suprima 50. It's the new style board. With the old board, the circulating pump ran continuously until the system was shut down by the timer. When the circulating pump shut off, the system made a short sort of rattling noise and then went quiet and went...