Still in Limbo!! I replaced the programmer today from Drayton 740m to Heatmiser tm4-ts....still no luck...boiler shuts off every 1 or 2 mins....Can I replace the pump? or 2 port valves? Any advise will be appreciated
Apparently, they can feed low voltages back to boiler PCB's and cause firing...
As said, just a thought if everything else is proved oakiedoakie
That's very interesting. Fortunately my 'German' boiler doesn't suffer from that problem, but it's not the same model as Badri's, will put this one away in my brain though