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Sorry to hijack the thread, my friend has the same boiler. he thinks he over pressured the system. The result is that now he loses all pressure instantly and if you repressure through filling loop, water flows at full rate through the discharge pipe. Any ideas. Its full flow and discharges...

By Switched live do you mean some kind of relay on the PCB? Green Power Switch on off has live Summer winter switch works checked with multimeter make.break was working prior to power going off, unlikely to be dead short on boiler else ELCB would trip. Timer light also on, so...

On second thoughts, the ring had tripped power circuit, lighting ok? but i reset ring (ELCB) and since power has been ok, the only noticeable difference is no CH., all other devices on ring no problem.

Cheers Matt Power cut

Hi Guys thanks in advance for any help. have an LS100 and changed diaphram in divertor valve a couple weeks ago, all in order for last 2 weeks. Lost electricity to unit today and since power came back on boiler developed a new fault. DHW working. No CH All fuses intact External F1...

cheers mate new diphragm kit works a treat xx

I have a 5 y old 4/5 y old combi that works perfectly on heating side. on dhw side it has stopped working. when on CH is switched off boiler refuses to fire. when CH switched on fires instantly but no hot water Any help.. thanks