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Author boiler problems
ARD1
Member
Registered: 4th May 04
Location: Notts
User status: Offline
24th Apr 08 at 20:50   View User's Profile U2U Member Reply With Quote
If your combi boiler keeps building up preasure when the heating is on, then not dropping back down when cold what could be causing this?, it keeps going up to 3 bar and then dumping water out the relief valve, any ideas have searched and could it be that the expansion vessel needs recharging?
Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
24th Apr 08 at 20:53   View User's Profile U2U Member Reply With Quote
pissibly a let by on the filling loop so is slowly filling and passing the relief valve pressue when hot.
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
24th Apr 08 at 21:03   View User's Profile U2U Member Reply With Quote
but would the preasure not increase even when off then
mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
24th Apr 08 at 21:54   View User's Profile U2U Member Reply With Quote
its the expansion vessel in the boiler is either failed or simply needs re charging, they just pump up like car tyres
aid03
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Registered: 21st Aug 06
Location: aberdeen
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24th Apr 08 at 22:04   View User's Profile U2U Member Reply With Quote
u have to dump the pressure 1st then pump up to one bar.. if u can get to the exp vessel take the dust cap off and push the pin if water comes out brust if air flat
mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
24th Apr 08 at 22:05   View User's Profile U2U Member Reply With Quote
I take it your a plumber as well then
aid03
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Registered: 21st Aug 06
Location: aberdeen
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25th Apr 08 at 07:22   View User's Profile U2U Member Reply With Quote
haha gas engineer lol
ARD1
Member
Registered: 4th May 04
Location: Notts
User status: Offline
25th Apr 08 at 18:36   View User's Profile U2U Member Reply With Quote
thankyou people will give it ago
ARD1
Member
Registered: 4th May 04
Location: Notts
User status: Offline
25th Apr 08 at 18:48   View User's Profile U2U Member Reply With Quote
ive not got a foot pump are they best to use or will anything with a preasure gauge do, going to look tomorrow
mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
25th Apr 08 at 19:00   View User's Profile U2U Member Reply With Quote
bike pump or summat, it has to have a pressure guage on it though, does it say on the boiler what the pressur eshould be? its usually 1 bar or there about
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
25th Apr 08 at 19:10   View User's Profile U2U Member Reply With Quote
well ill have to unscrew the front first to have a look, what does it look like
mattk
Member
Registered: 27th Feb 06
Location: St. Helens
User status: Offline
25th Apr 08 at 19:18   View User's Profile U2U Member Reply With Quote
put in google images expansion vessel

Make sure the pressure guage on the front of teh boiler is on zero
mattk
Member
Registered: 27th Feb 06
Location: St. Helens
User status: Offline
25th Apr 08 at 19:19   View User's Profile U2U Member Reply With Quote
in fact when you see the vessel push the valve down to see if any air comes out, if water comes out its goosed
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
25th Apr 08 at 19:28   View User's Profile U2U Member Reply With Quote
its a baxi combi eco80 is there just a valve to attach the pump to? the picks i found look like an orange hockey puck
mattk
Member
Registered: 27th Feb 06
Location: St. Helens
User status: Offline
25th Apr 08 at 19:30   View User's Profile U2U Member Reply With Quote
yeah you cant miss it really, their normally red or orange, will most probably be on the side if its a baxi, the valve will be easy to get to, pump it up as you would a car / bike tyre
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
25th Apr 08 at 20:00   View User's Profile U2U Member Reply With Quote
i take it , it will be behind the big heat plate?
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
3rd May 08 at 13:16   View User's Profile U2U Member Reply With Quote
i cant find anything that looks orange or red in the boiler? ive got some pics if that helps
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
3rd May 08 at 13:38   View User's Profile U2U Member Reply With Quote




ARD1
Member
Registered: 4th May 04
Location: Notts
User status: Offline
3rd May 08 at 13:39   View User's Profile U2U Member Reply With Quote
is it that thing on top of the pump?
mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
3rd May 08 at 15:03   View User's Profile U2U Member Reply With Quote
no, thats an automatic air vent

from the pics it looks like it could be at the back behind the heat exchanger, behind the silver plate
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
3rd May 08 at 17:31   View User's Profile U2U Member Reply With Quote
how would i get to that? as that bits on the wall.
mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
3rd May 08 at 19:52   View User's Profile U2U Member Reply With Quote
Its hard to say with out having a poke around it, its a 12 ltr one in them so it wont be small
ARD1
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Registered: 4th May 04
Location: Notts
User status: Offline
3rd May 08 at 20:15   View User's Profile U2U Member Reply With Quote
mmm, so if its behind the heat exchanger on the preasure release valve side, as thats where the expasion pipe comes from, unless its behind the big metal burner part at the top as i wouldnt of thought a 12ltr one would fit anywhere else?
ARD1
Member
Registered: 4th May 04
Location: Notts
User status: Offline
3rd May 08 at 20:21   View User's Profile U2U Member Reply With Quote
pic from under the boiler far right pipe is expasion pipe, then heating return, then cold feed, then gas, hot water and heating out

 
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