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    Ecotec 637 Plus always "on"/showing heat demand

    Thanks- yes am going to replace the head now. Tom
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    Ecotec 637 Plus always "on"/showing heat demand

    Hi Thanks for this. In looking to answer your questions (checking the signal from the boiler relay etc) I eventually diagnosed the CH motorised valve. It was sending a live signal to the boiler when the controller wasn't calling for it. There was some debris in the microswitch which I cleaned...
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    Ecotec 637 Plus always "on"/showing heat demand

    Hi My Ecotec 637 has recently started being "on" the whole time, even when there is no demand for heat. It thinks there is (the radiator symbol is constantly on), and so is maintaining the system to temperature. The heating & hw system (honeywell evohome) isn't calling for heat, and it still...
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    Questions re CH/HW configuration and does Vaillant 637 Plus have bypass valve?

    Hi I have a few questions about my Ecotec 637 Plus installation (about 3 years old). I’ve tried to break them down clearly as there’s quite a lot. 1) I have been upgrading our TRVs and central thermostat to an Evohome connected system. I would like to put all valves on this system but know...
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