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Vaillant EcotecPlus Boiler --Pressure gauge erratic?

Hi: When my heating is on, the needle of the pressure gauge shoots right up to the red. Then when the heat is off, it goes back down and sometimes dips to register an 0.5 bar pressure reading. Really confused. We have about 14 radiators running off the system and our sunroom has underfloor heating, which is also powered by this boiler. The boiler is only three years old. Any help would be really appreciated. Thanks.

Moira
November 2009

Vaillant Heating, Home Heating Systems Vaillant Boiler Heating

Hi again:

Just a quick thanks to Ste and Sean for setting me on the right track.

Until they took the time to respond, I didn't even know I had an expansion vessel.

Much obliged and very grateful.

Moira
November 2009

probably but maybe not worth the agro, call a heating engineer and ask how much to recharge vessel, shouldnt take more than 15mins and no parts unless vessel is fooked so should only be a labour charge if it sounds high ask him/her what the cost involves.

also 14 rads and u/floor heating is probably squeezing expansion rates anyway, a extra vessel could be considered if this becomes a common problem.

ste
November 2009

Sean

Thanks, but I've no idea how to recharge the pressure vessel. Is it something simple that I could do myself? Fingers crossed. Moira

Moira
November 2009

recharge the pressure vessel

sean
November 2009