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    Vaillant 637-comm error

    I've recently had a Vaillant 637 system boiler fitted, everything was working fine until a couple weeks ago when the VRT 360 started to display 'comm error' message. i switched everything off and it seemed ok but over the weekend it i started to get the error message again. When the error...
  2. S

    vaillant 637- no hot water

    Just installed a new boiler system: Vaillant 637: Ariston Primo ITI 300: 2x 2 port valves(grey & orange wires isolated): VR 65: VRT360. The CH seems to be working fine but im getting no joy with the DHW. I've swaped the 2 port valves over and still getting the same problem. the d.70 is...
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