Heating/Boiler problems!?!
Heating/Boiler problems!?!
Author
Discussion

skinner05

Original Poster:

3,352 posts

222 months

Tuesday 9th December 2008
quotequote all
We have been having some issues for a while now with our water temperature fluctuating during use. For example, in the shower, for the first 10 seconds or so it is fine but then for the rest of the time it will switch between the right temperature to going cold and then back to warm (without touching anything). Same with all the taps, they cant stay hot for longer than 5 seconds. So we had British Gas come out who thought they knew what was wrong, something to do with too much gas being used for the radiators and not enough for heating the water. So they came back yesterday, spent two hours fitting new parts and nothing has changed really. The taps closest to the boiler downstairs are better but upstairs its just as bad as it was.

Does anyone have any idea what could be causing this or has anyone experienced similar?

cheers

skinner05

Original Poster:

3,352 posts

222 months

Tuesday 9th December 2008
quotequote all
Anyone?

pc.iow

1,879 posts

232 months

Tuesday 9th December 2008
quotequote all
If IT'S a Vallaint combi-boiler,it could be the 'hot water diverter valve'.
Try turning your heating on,then try the hot water from the tap.If that works,its the diverter.
If not,you could need a new biolew.

GreenDog

2,261 posts

221 months

Tuesday 9th December 2008
quotequote all
Had something similar a few years ago with a traditional heating system (hot water tank in the airing cupboard rather than a combi). Turned out it was something called the actuator valve which I bought from a heating suppliers and replace for about £37. It was a separate bit to the actual boiler so wasn't too hard

Ferg

15,242 posts

286 months

Tuesday 9th December 2008
quotequote all
Bit more info?
What boiler is it, please?

richyb

4,615 posts

239 months

Tuesday 9th December 2008
quotequote all
Very spookily I have the exact same problem at the moment and have British Gascoming out Thursday. I did wonder whether it was something to do with the temperature outside dropping so much that it was struggling to power both the hot water and central heating.

skinner05

Original Poster:

3,352 posts

222 months

Tuesday 9th December 2008
quotequote all
Ferg said:
Bit more info?
What boiler is it, please?
Its a Baxi boiler.


Ferg

15,242 posts

286 months

Tuesday 9th December 2008
quotequote all
Is it a combination boiler?

skinner05

Original Poster:

3,352 posts

222 months

Tuesday 9th December 2008
quotequote all
Ferg said:
Is it a combination boiler?
Yeah

Ferg

15,242 posts

286 months

Tuesday 9th December 2008
quotequote all
Well, assuming it's a 80/105E or similar, my 'guess' without seeing it would be the hot water thermistor isn't sensing correctly.
Alternatively they do suffer from a rather crappy gas valve on the early ones on which the 'low flame' drifts. They use a cobbled up half SIT-half Honeywell valve with a funny little adjustment for the modulation.
You need someone who actually knows what they are doing, which I have to say, you haven't had 'round the house yet by the sound of it.

skinner05

Original Poster:

3,352 posts

222 months

Tuesday 9th December 2008
quotequote all
Ferg said:
Well, assuming it's a 80/105E or similar, my 'guess' without seeing it would be the hot water thermistor isn't sensing correctly.
Alternatively they do suffer from a rather crappy gas valve on the early ones on which the 'low flame' drifts. They use a cobbled up half SIT-half Honeywell valve with a funny little adjustment for the modulation.
You need someone who actually knows what they are doing, which I have to say, you haven't had 'round the house yet by the sound of it.
Ok, cheers

Ferg

15,242 posts

286 months

Tuesday 9th December 2008
quotequote all
Sorry. Having read your original post again, I would add that it may just be the domestic heat exchanger blocking up.....
This online diagnosis isn't easy I'm afraid!!! smile Are you getting any diagnostics from the temperature lamps across the front, or isn't it actually locking out?

2 sMoKiN bArReLs

32,007 posts

264 months

Tuesday 9th December 2008
quotequote all
I'm sat freezing my nuts off again as my Envoy 80 has gone west the second time this winter!!


Ferg

15,242 posts

286 months

Tuesday 9th December 2008
quotequote all
How far west? New York?

2 sMoKiN bArReLs

32,007 posts

264 months

Tuesday 9th December 2008
quotequote all
Ferg said:
How far west? New York?
scratchchin I do know an englishman who lives there.....

dirkgently

2,160 posts

260 months

Tuesday 9th December 2008
quotequote all
Ferg said:
Well, assuming it's a 80/105E or similar, my 'guess' without seeing it would be the hot water thermistor isn't sensing correctly.
Alternatively they do suffer from a rather crappy gas valve on the early ones on which the 'low flame' drifts. They use a cobbled up half SIT-half Honeywell valve with a funny little adjustment for the modulation.
You need someone who actually knows what they are doing, which I have to say, you haven't had 'round the house yet by the sound of it.
yes NTCs first port of call