How do, all - first time poster.
We had a Vaillant Ecotech 937 Plus boiler installed just over 6 years ago, and over the last few weeks it became increasingly difficult to get any hot water out of the taps, although the central heating was unaffected. (We'd had it serviced every year since to the best of my knowledge, although it may be pushing a year and a half since the last one, and it hasn't given any trouble.)
However, during this recent spell water from the kitchen taps (ground floor) just would not run hot, while running the taps in the bathroom (first floor, and also the site of the boiler) would eventually cause the boiler to fire up and also to supply hot water to the kitchen thereafter.
A few days ago, it stopped producing hot running water altogether. When viewed, the digital display would show the temperature climbing rapidly to about 84 degrees and it would sound as though it was burning gas, even though the little flame indicator on the display was not showing. At that point, the sound I took to be gas burning would stop, and the temperature would fall rapidly to fifty-odd degrees. I think I also saw a F.81/F.91 error code on the display on one occasion.
Anyway, we've had a certified Vaillant engineer out. Today is his second day, and after fitting some parts he says it's something to do with a heat exchanger and that he can't fix it, so we basically need a new boiler (sorry not to be more exact, but I'm at work while my wife is at home dealing with it ).
I hate to seem suspicious, but in this day and age you can't be too careful. As a layman it seems to me that if the bloody thing can burn gas, heat water, and pump it through pipes to radiators, why should it need replacing? Shouldn't it be possible to fix the bit that makes it supply that same hot water to the taps?
All feedback gratefully received - thanks for reading.
We had a Vaillant Ecotech 937 Plus boiler installed just over 6 years ago, and over the last few weeks it became increasingly difficult to get any hot water out of the taps, although the central heating was unaffected. (We'd had it serviced every year since to the best of my knowledge, although it may be pushing a year and a half since the last one, and it hasn't given any trouble.)
However, during this recent spell water from the kitchen taps (ground floor) just would not run hot, while running the taps in the bathroom (first floor, and also the site of the boiler) would eventually cause the boiler to fire up and also to supply hot water to the kitchen thereafter.
A few days ago, it stopped producing hot running water altogether. When viewed, the digital display would show the temperature climbing rapidly to about 84 degrees and it would sound as though it was burning gas, even though the little flame indicator on the display was not showing. At that point, the sound I took to be gas burning would stop, and the temperature would fall rapidly to fifty-odd degrees. I think I also saw a F.81/F.91 error code on the display on one occasion.
Anyway, we've had a certified Vaillant engineer out. Today is his second day, and after fitting some parts he says it's something to do with a heat exchanger and that he can't fix it, so we basically need a new boiler (sorry not to be more exact, but I'm at work while my wife is at home dealing with it ).
I hate to seem suspicious, but in this day and age you can't be too careful. As a layman it seems to me that if the bloody thing can burn gas, heat water, and pump it through pipes to radiators, why should it need replacing? Shouldn't it be possible to fix the bit that makes it supply that same hot water to the taps?
All feedback gratefully received - thanks for reading.
