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Mend Vaillant 630 ecotech plus Boiler Pressure

Pressure problem on vailant 630 ecotech plus?

Hi I have a Vailant 630 system boiler and the pressure goes up to maximum 3.3 bar and im force to take water out from the radiator to decrease the pressure, I just changed the expansion vessel and pumped it before conecting it to 12 psi as per instruction I have also changed the pressure sensor, as I said I set the pressure initially at 1.3 bar after few hours it reaches 1.9 and the following day is at maximum 3.3 bar. Can someone please advise what to do, many thanks

Darius
December 2010
VaillantVaillant 630 ecotech plusHeating, Home Heating SystemsBoiler Pressure Vaillant
Assuming you have re-charged the expansion vessel correctly (including leak testing the Schrader valve after charging), I suggest setting the system pressure to the correct level and completely disconnecting the filling loop. it may be slow filling if the valves do not shut off completely.

Carefree
December 2010

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Vaillant 630 ecotech plus: Pressure Issues