ARD1
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Registered: 4th May 04
Location: Notts
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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?
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
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pissibly a let by on the filling loop so is slowly filling and passing the relief valve pressue when hot.
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ARD1
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Registered: 4th May 04
Location: Notts
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but would the preasure not increase even when off then
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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its the expansion vessel in the boiler is either failed or simply needs re charging, they just pump up like car tyres
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aid03
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Registered: 21st Aug 06
Location: aberdeen
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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
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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I take it your a plumber as well then
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aid03
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Registered: 21st Aug 06
Location: aberdeen
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haha gas engineer lol
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ARD1
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Registered: 4th May 04
Location: Notts
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thankyou people will give it ago
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ARD1
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Registered: 4th May 04
Location: Notts
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ive not got a foot pump are they best to use or will anything with a preasure gauge do, going to look tomorrow
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mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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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
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ARD1
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Registered: 4th May 04
Location: Notts
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well ill have to unscrew the front first to have a look, what does it look like
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mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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put in google images expansion vessel
Make sure the pressure guage on the front of teh boiler is on zero
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mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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in fact when you see the vessel push the valve down to see if any air comes out, if water comes out its goosed
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ARD1
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Registered: 4th May 04
Location: Notts
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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
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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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
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ARD1
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Registered: 4th May 04
Location: Notts
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i take it , it will be behind the big heat plate?
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ARD1
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Registered: 4th May 04
Location: Notts
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i cant find anything that looks orange or red in the boiler? ive got some pics if that helps
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ARD1
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Registered: 4th May 04
Location: Notts
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ARD1
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Registered: 4th May 04
Location: Notts
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is it that thing on top of the pump?
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mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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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
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ARD1
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Registered: 4th May 04
Location: Notts
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how would i get to that? as that bits on the wall.
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mattk
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Registered: 27th Feb 06
Location: St. Helens
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Its hard to say with out having a poke around it, its a 12 ltr one in them so it wont be small
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ARD1
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Registered: 4th May 04
Location: Notts
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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?
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ARD1
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Registered: 4th May 04
Location: Notts
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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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