central heating combi boiler problem Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[carter barter]

I have a Ideal C80FF combi boiler that is playing up. The problem is the presure keeps droping down to zero but when I presurise back up to 1Bar it runs ok but the preasure soon rises up to 3bar I then turn the heating off and it soon drops back down to 1Bar and below. Any Ideas?[/b]

[Steve the gas]

Hi,

Check the expansion vessel, it has a schrader valve,check pressure in it.
It should be 0.8 - 1 bar, diaphragm could have failed.
Don't be too worried about the 3 bar pressure the PRV will dump the water outside.

If this is worrying you - get an RGI in.

Hth

[htg engineer]

As stg says - it'll be the expansion vessel at fault. Press the valve on the expansion vessel.

Air ? re-pressurise
Water ? the diaphragm is shot and you need a new vessel.


htg