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great - you are correct:-) In fact, just pushing the switch back in with a screw driver (to loosen it) has (at least temporarily) fixed the problem. Thanks again

thanks - I'll take a closer look later

thanks. Is there a way to tell whether this is due to the switch being broken or whether something else that controls it (like a temperature sensor) is broken? Also, the manual refers to 2 switches: 5.21 Water Flow Switch D.H.W 5.22 Microswitch (D.H.W Flow Switch) ps Although I have...

Hi, I've just started to experience a problem with my potterton puma 80e combi boiler: when I switch it on (from standby, with CH off) it 'fires up' and stays on (without any hot water taps running) and after a few minutes a rather alarming rumbling/ hissing sounds developes and...