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sorry might have sounded confusing : if the CH FLOW SWITCH was stuck in the ON position then the boiler would continue to fire even if no demand was being made from CH or DHW. So if the pump was failing/not working then this lakc of circulation would make the overheat stat trip and send the...

dave18 that is true about the flow switch. Could be a sludged up heat ex or air trapped in the system somewhere, or possibly a faulty overheat stat. Poster: drain some water from your system at a low level drain valve and see what colour/quality the water is....? dave18 - the CH flow...

if the pump wasn't working surely the flow switch wouldn't proe it back to the pcb and the boiler wouldn't fire up at all? Unless it's starting to fail...

Hello all, I have a question and have searched by cannot find an answer. I have a combi boiler in my house, I was wondering how it works. When you open a hot tap, the boiler fires up and hot water is shortly deliered at the hot tap. My boiler has no intermittent or perm pilot btw...