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I believe the builders plumber also reduced the boilers output (d0) but had no effect

Thanks John, not seeing a pressure drop (see reply above) and reluctant to suspect the pump or the new pressure switch but don’t know where to go from here. F&R around 72/58 (radiator temp control knob was set at 68)

Thanks for the S7 confirmation Not seeing an increase in pressure on the digital display when the pump starts. Pressure switch has been replaced with genuine part and seems to report accurately when water is drained/refilled and as the heating increases and also accurately mirrors the analog...

Vailant ecoTEC plus 637 System Boiler S Plan Unvented Cylinder Honeywell ST6400C controller 13 Radiators Boiler not igniting - S.97 F.75 Boiler was working fine before 2 radiators were relocated during renovation. Now boiler fails to ignite and gives s.97 then F.75 code. System has been...

Cheers Eric, I did have a paragraph about earthing in my original draft but deleted it as I thought my question was getting too wordy. I haven't got an electrician yet, we are getting a lot more work done on the property so will go with the builders electrician or recommendation. How will he...

3 questions - - Is my suggested route ok? - Is the 6mm cabling suggestion ok? - Would it be much different/cheaper if I stuck with a 13amp Hot Tub? I am fitting some plasterboard and cupboards in a garage that is attached to the house. The consumer unit is also in the garage. I want to have...