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Vokera Boiler - pressure too high and hot water keeps going cold?

I have a problem with my vokera boiler (i believe compact version but not sure),

over easter i noticed the pressure was way too high for some reason and spoke to a friend who advised what to try - at 1st we thought it was the intake pipe to repressurise the unit so disconnected this and still pressurising - have even turned off the unit but still pressurising - have not turned off at mains, turned of the gas and turned off the water to it

he believes it could be the heater exchange - is it common that these boilers only seem to last around 15 months before something goes wrong with them.

Mike
March 2008

Vokera Heating, Home Heating Systems Boiler Keeps Going Cold

everytime i put heating on pressure goes way up to 3
have bled radiators

margs
September 2012

Added to my original answer the filling loop at the bottom of the boiler was the original one and was bypassed years earlier with a seperate filling system which is used to fill the boiler. the orignal one started to seep so this was the one we capped off.

Ryan
November 2010

I Had this exact problem

Did the heater exchange but it was not this as well. We found that the original filling loop at the bottom of the boiler had been bypassed previously but had started to seep water into the boiler and over time the pressure built up, so we capped this off and now it is fine.

Ryan
November 2010

I have this problem. British Gas have installed a heating plate, new valve, new sensors and now a new circuit board but are saying it's the water pressure that is the problem, yet downstairs flat has the same boiler, same pressure and they have hot water. Anyone got any suggestions?

Sarah
October 2008

get a corgi engineer in asap

steve johnson (plumber)
June 2008

yeh phoned vokera and they sent someone out to repair

problem was with heat-exchanger

and is serious if you don't fix it

Mike
May 2008

Hi Mike did you ever find out the problem as i'm having the same problem with my boiler?

Jimmy
April 2008

May be a pinhole in the DHW heat exchanger then? (between the mains water side and the boiler side). If you turn off the cold water inlet tap to the boiler so that hot water does not come out of the hot water taps, and leave a hot water tap open (so that there is no pressure on the domestic hot water side) the boiler pressure should drop and the hot tap drip as water is pushed through the pinhole the other way. If its a year old then you may be able to get a replacement from Vokera under guarantee. Ring Vokera.

c
March 2008

the filling loop has been disconnected - as this is what we 1st thought it was

Mike
March 2008

This does not sound like a 'boiler' problem, if your pressure is raising like that the filling loop must still be connected, as mains water is bringing the pressure back up.

When you say, you disconnected the 'intake' pipe, where was this and what was it like?

T
March 2008

thanks

the pressure rises when the system is cold without any heating on - i have drained it back to 1 but come 8 hrs later with no heating or hot water being used it's back up into the danger level just under 4bar

i thought the boilers only had 1 year warranty - but not sure where i would stand as think friend is no longer corgi registered and didn't fill in anything on the documents

Mike
March 2008

Sorry, should have added, if your system pressure is too high when system is cold, bleed of the pressure by bleeding a radiator until you get back to 1 bar when cold.

T
March 2008

What is the boiler pressure when system is cold (should be 1-1.5 bar)
Does it rise to 3 bar when heating? if so, sounds like your expansion vessel may need charging or at worst replacing.

If you heat exchanger is on the way out, you would most likely either hear a lot of banging when hot of notice a pool of water below your boiler (then it has certainly failed)

You say your system is 15 months old, did you not apply for your warranty? (2 years!) Ring vokera......

T
March 2008