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How do you tell if it's been flushed properly? I was there when it was done initially and seemed fine to me. Attach machine to sysyem, plug machine in, add chemicals, turn on, takes about 1/2 a day. How can it go wrong? If I get someone in to do another powerflush, how do I know they've done it...

Right, Vaillant engineer has been. The reason the boiler is overheating is because it's full of gunk. System needs a powerflush and even then might not fix problem. May need new HE's. Question is boiler is only 32 months old and when it was fitted it had a power flush prior to installation. So...

Heat exchanger came off and was cleaned just before Christmas, all be it by non Vaillant plumber. I wasn't there at the time but was told there wasn't much in there and was cleaned out. Heat exchanger was taken apart by Vaillant engineer in Dec 2006, but then the problem was attributed to...

d40 is 86°C when goes off, d41 is 72°C when goes off, D60 is set at 8 and D35 when DHW on is 1 = hot water. 86°C seems a tad high to me

When HW tap on boiler sequences S13 then S14 as expected, then just before it conks out goes to S16 which according to installation manual means fan over run. However, as expected, manual doesn't explain what this means, and expects you to call out Vaillant engineer for £220 a pop!

this has been checked twice, once by Vaillant engineer, and no problem with heat exchanger, system fairly clear, boiler fairly new only 2 years old.

Can anyone help, at wits end with fluctuating DHW temp. Turn on a HW tap, get variable temp, lukewarm to warm, never 55 deg C as set, HW temp approx 30 deg C. Looking at boiler (Vaillant combi 828/2E Ecomax) display when HW tap turned on, looks like burner kicks in for a few secs, HW outlet...

After installation of new kitchen, hot water no longer as hot as it used to be. The only plumbing changes during kitchen installation, were new main stopcock and extension of HW and CW pipes (by about 15 inches) to new mixer tap for sink. After investigation of boiler (Vaillant combi condenser...