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Thanks, I was aware of the good reputation for these boilers, which is why we opted for one. The F.75 wasn't caused by dirt in the system, it turned out to be a problem related to the boiler not being able to cope with a low flow resistance, apparently a design fault that can be fixed by...

More testing this morning seems to show that it must be the PCB, I think. I thought that turning the power off, waiting for ten minutes and then turning the power back on had fixed it, for an hour or so. Testing it this morning seems to show that it can also get stuck on no CH, even when the...

Thanks, folks. This boiler has been a pain from a couple of months after it was installed. It had a 12 month guarantee from the installer, not, as I found out much too late, the three year warranty that Vaillant provide. The F.75 fault started a couple of months after installation, the...

My troublesome 4 year old Vaillant EcoTec 831 has now developed another problem that has me stumped. The boiler stays firing in CH mode even when the thermostat isn't calling for heat, resulting in things getting a bit warm in the house. These are the things checked so far: 1. Thermostat...

I'm sure you're right, I did feel sorry for the guys who were trying to fix it, as it was getting to the point where they were a bit embarrassed about the problem every time they called around. I'm sure that if they'd been given the right information they would have fixed it, and I can't help...

Thanks again. I'm sure you're right, the guarantee I have seems to be from the installer, not Vaillant themselves. The system was flushed for a couple of hours before the boiler was installed (as I mentioned at the top of this page), and it has a filter fitted underneath it, on the return...

Thanks, that conflicts with the paperwork I have, though. The installer has clearly said in the quote I have that the guarantee is for 12 months, with an option (that I foolishly didn't take up at the time) of extending this guarantee to four years for an extra sum. As you rightly say...

I've just double checked the paperwork and the boiler was installed in September 2008, and definitely came with a 12 month guarantee, not two years, I'm afraid. I'm not sure what you mean by copper tubes, as my boiler still has two rubber hoses at the back (the ones that originally...

Knowing what I know now, I'd have to agree 100%, and wish I'd understood this back when we had the boiler installed. I'll admit to be sceptical at first (hence the retention of the simple programmer/'stat) but with all the added insulation to the house and the improved airtightness we do really...

Thanks, I did consider the Ebus control option, but decided to retain the simpler control that we already had. With hindsight, now that we've improved the house insulation, I should have really opted for a weather compensating control system, as we don't really need high flow temperatures...

Not a "wind up" as you put it, at all. First, the warranty was for one year, not two. Second, the installers came out around a dozen times in that first year to try and fix, or in the case of the leaking hoses fix, the boiler during the warranty period, then said they had to charge for the...

Thanks, that's interesting about the remodel kit to fix this fault. Both the companies that have looked at this contacted Vaillant for advice, I'm sure. I remember on at least one occasion the engineer having a 'phone conversation to someone technical at Vaillant, whilst trying to get to the...

Thanks very much for the tip about balancing, it'd not occurred to me before, as when we had TRVs fitted all the LSVs were wound wide open, in the belief that the TRVs would balance the system (which indeed seems to be the case). What you say makes perfect sense though, as when the temperature...

As it happens, I've had sensors fitted to these pipes and connected to a data logger. We super-insulated the house, by degrees, over the past few years, so significantly reducing the heating requirements, which allowed me to turn the flow temperature down in an attempt to keep the boiler...

Thanks once again for the valuable replies. It's nice to know that the advice I originally received about the reliability and performance of this boiler was correct, but galling to have experienced so many failures, pretty much from the time it was first installed. I think the hoses started...

Many thanks for the swift reply. I've had two engineers look at the F75 problem now, the original installers (who did try their best but ended up as frustrated as I am) and another local chap who seemed to know his stuff but again was foxed by the problem. The system was power flushed when...

Hi, We had an Ecotec 831 installed around 4 years ago, to replace an ancient wall mounted boiler. The improvement in efficiency (and much reduced gas bill) was welcome, but the thing has been very unreliable, with the dreaded F75 fault being a very regular occurrence each winter, and...