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Problem sorted, overheat thermostat showing continuity but dodgy connection replaced spade end connector and VOILA; A OK. Thanks to all who helped.

Thanks Tony I realise the need to use Gas safe etc however just wondered why it may not be working as I never touched the thermocouple so presumed it may be a pressure switch issue or something simple like that?

Hi all, I've replaced the diverter valve diaphragm and the demand light is now lighting to show it is working BUT the pilot light now refuses to stay lit the system has been recharged but I can hear a gurgling sound from boiler when hot water taps opened is this trapped air and is it a likely...

Completed the diaphragm replacement and the demand light is now lighting to show it is working BUT the pilot light now refuses to stay lit the system has been recharged but can hear a gurgling sound from boiler when hot water taps opened is this trapped air and is it a likely cause for non...

Thanks to everyone for their help, Ive bought the parts and should be sorted by tonight!!

Thanks for the info Gasguru, is a generic diaphragm available / advised or the Worcester part?

My combi boiler is working fine fine for central heating but has stopped producing hot water, although it has worked a couple of times then failed again immediately after turning off the tap and re trying. I used the diagnosis flow chart in the manual the standby power light is on but no demand...