Recent content by JonWoods

  1. J

    Vaillant boiler not responding to request for heat

    Figured it out. Isolator switch had been hidden behind a big cabinet and must have got knocked somehow. Real face palm moment :LOL::LOL:
  2. J

    Vaillant boiler not responding to request for heat

    Got a strange issue where the boiler is stuck in state of s.30 which is no demand. Initially tested by looping pin 3 and 4 together and boiler fires up no problem for water and heating. Assumed this was a fault with the thermostat so replaced with a new one. However boiler still not responding...
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