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    Vaillant Expansion vessel charging/failing?

    Hi folks We have a Vaillant ThermoCOMPACT 637. It is about 8-9 years old. When using the heating for the first time last week I checked the boiler and noticed that the pressure was nearly zero. Having been reading various threads here and from watching the boiler this morning I think I...
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    Valliant boiler never reaches flow temperature set on boiler

    Hi everyone I have a Vaillant thermoCompact 637E. If I set the flow temp on the boiler dial to say 67 it only gets up to 61/62 on the display. If I set it to say 72 it sits around 65/66. I've balanced the system and aimed for around 10-12 deg differential on the rads. When checking the...
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