I have a vaillant combi boiler turbomax i think. the pressure has dropped to almost zero and there is no warmth coming from the radiators upstairs, the water and downstairs raditors work well so far! I have tried to fill the boiler with water to increase the pressure but nothing happened? What next?
there should be a pressure valve underneath the boiler where you can allow more air in to raise the pressure.
Pressure should be between 1.0 and 2.5. I always aim for about 2.0. make sure you close the valve again after allowing air in. If there are several valves, best refer to the manual.
Not a plumber!
December 2008
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