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  • Boiler/heating system knowledge needed, please! Baxi Solo 2 60 pf boiler working fine when just heating water or heating rads with all TRVs fully open, but when using them to regulate room temps the boiler cuts out and the overheat light comes on. Local plumber telling me that it needs an auto bypass valve fitting. Does this sound right? Asking as he gave some pretty shit advice about the size of a new hot water cylinder. Fanks in advance!

  • Do you have at least one rad with no trv?

    If not you need to leave one fully open. Ideally the one near the thermostat.

    If you are already doing this, not a clue, sorry.

    Edit for typo

  • Yes as above, if using TRVs you need either:

    • bypass valve, or
    • one rad without a TRV or with the TRV always fully on - to save wasting energy you should have a room thermostat in this room that cuts out the central heating pump when up to temperature.
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