Recent content by DWINYARD

Indeed, but if I drain it I have to fill it again with a special water, right? I can't just fill it from the tap I'm guessing as the impurities in tap water are unwelcome.

Woot! This is an avenue definitely worth investigating first then! Thanks for the pointer.

This is the one on the pipe directly connected to the PHE yes? I can't budge it with my fingers. It's slightly flexible on the near-side, but feels like it's a very high pressure, if that makes sense. My grip can hardly make a change to it. On the far side, it's hard has rock. Feels like it...

My homecare lapsed - my fault that one. I got fed up of paying year after a year for a faultless boiler. Let that be a lesson to me ;-) I haven't tried a fast cleanse. I buy that from a plumbing specialist, right? Then empty the boiler, put that stuff in, run the boiler a bit, then put some...

Okay I'll call Vaillant, thank you for the number - except I don't believe it is Plate HE as the problem occurs in both CH and DHW mode, and I am satisfied the flow control valve is working.

Can it be flushed in-place? From the installation manual (and the replacement quote) it looks like just taking it out and putting it back is a good 2-3 hours of work.

Okay, the manual does not list the Diagnostic codes (helpful eh?). So, I put it into Diagnostic mode and just went with D40 and D41. Turned on the hot tap. At the point at which the boiler cut out (within about 20 seconds), D40 = 69, D41 = 34. This makes sense. The error description of E12...

The problem: EcoMax 824E Vaillant boiler, about 10 years old. Fails regularly and reports error code E12 (differential temperatures too high). Problem happens when hot taps are on (so, taps run hot, then cold, then hot again, etc.). Also happens when Central Heating (only) is on. So, it's not...