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Are there any really good cleaning agents that I can leave in the system for some time, to see if it will clean up the internals and reduce the restriction? I am basically expecting Vaillant guy to say it's the main heat exchanger and that'll be another £400 to replace on top of the £285 fee...

OK, fair enough, I've booked the fixed price repair with Vaillant and we'll see what comes of it... I am concerned it'll be the main heat exchanger and £££ :( Any thoughts on whether I should get the magnetic filter moved over to the return pipe instead of the feed? Can the two pipes be...

Hmm, didn't know that, what then is meant by diagnostic code d.35: Diverter Valve Position, either 0 = heating system, 1 = hot water, 2 = mid-position

After a bit more playing with it, I'm now suspecting it's the pump at fault, or... a significant resistance to flow against the pump, within the boiler - i.e. a partial blockage of the main heat exchanger. When the pump is set to "Auto" (presumably runs slower than 100%), I can replicate the...

Hi, I hope you can provide some advice on an issue I'm having with my Vaillant Ecomax 835e. When I turn on DHW downstairs, the boiler fires and provides hot water as expected. But upstairs when the shower or bathtub are used, the water will get (very) hot, then steadly decrease in temperature...

Many thanks!

Hello everyone, I've got a water pressure problem in my loft (actually it's 2.4 bar static, but drops off to almost zero if anyone uses a tap while I'm in my electric shower) So, while investigating the pipework, I noticed this under my stairs (see attached) I expect it's an old gas...