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The paddle was free in the one I removed. I wonder if the switch had just become faulty. I live in a soft water area yet there were some significant hard deposits within the housing.

Yes, number 3 now. They don't seem to be very good. Or is my system breaking them!

So finally got to the boiler today. Turns out a faulty flow switch was causing all my issues. Luckily I had bought a spare, so im back in business now! Cheers for the advice.

Would you happen to know resistance values expected if I had to test the control stats and pipe stat?

Interesting read. Ive had issues with the flow switch before, I've changed two already. I didn't think that could be the issue but I guess it makes sense that it could be. I have a spare at least.

Ill give that a go tomorrow and see how it goes. Ill post again with the results.

I couldn't say for sure if it happens on DHW or CH or both. It happened today while I was trying to investigate the issue, I think I might have turned the hot water stat up to get the burner on. Burner remained on until the water expanded so much the relief lifted then it tripped. Burner...

Hi I've got a heatslave 18/25 external boiler. Burner seems to stay on too long and heats the water excessively causing the boiler over heat and high limit stats/thermistors to trip. These stats are doing there job so pretty sure theyre working correctly. Does anyone one know what stat...