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  1. J

    Which is to blame? The Vaillant boiler or the timer/temp

    Hi, I have a Vaillant Ecotec Pro 28 that was installed less than 2 years ago. The electrics were also replaced at the time with a brand new electronic timer and a remote temperature controller. The heating works fine when it is on (timer is on and temperature is also on) but when I shut...
  2. J

    Opening a Vaillant Sine 18 T3TWF H to repressurize the PV

    Hi, My Vaillant's pressure is going to zero overnight with all the symptoms that match the FAQ entry "REPRESSURISING THE PRESSURE VESSEL". The procedure seems pretty straightforward and I would like to try it. I need to open the left hand side of the boiler but before I start unscrewing...
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