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  1. Replies
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    That sounds workable for me. Thanks for the help.

    That sounds workable for me. Thanks for the help.
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    That sounds perfect. Just to confirm in this...

    That sounds perfect. Just to confirm in this arrangement - if I set the target temperature low enough the boiler will still turn off the pump (as you mentioned in an earlier post)?
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    I'm intrigued by what you are saying. Can you...

    I'm intrigued by what you are saying. Can you help me understand a bit more about what changes when you add the 7-8 link?
    If we ignore the HW question for now and assume I was just running the CH...
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    P.S. I found the earlier posting...

    P.S. I found the earlier posting from bruce_miranda and, if I've read it correctly, that seems to confirm that the OT control can operate alongside using input 4 to switch demand on/off if required...
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    That was certainly my thinking. I'm assuming...

    That was certainly my thinking.

    I'm assuming that the demand signal into the boiler will override what the OT control might be doing so - in HW mode - if HW thermostat has reached temperature and...
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    Excellent - thanks. Sounds like I'm pretty much...

    Excellent - thanks. Sounds like I'm pretty much set.
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    I see. I'm pretty sure there is nothing...

    I see. I'm pretty sure there is nothing 'non-standard' there. Here's a picture of the front panel.1793
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    I'm not sure if that would help me - but...

    I'm not sure if that would help me - but apologies if I've missed something. My boiler has only one circuit with one demand signal connected to it (terminal 4 on the circuit board) and is driving a...
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    I don't have Evohome as I'm using my own control...

    I don't have Evohome as I'm using my own control system. I was hoping that I could have CH heating at the same time as HW but not have the radiator feed running at full temp (which is currently 65C...
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    I have nothing connected to the eBUS. What do you...

    I have nothing connected to the eBUS. What do you mean by 'additional boiler controller'?
    My existing system (Y-plan) just controls the demand signal into terminal 4 on the boiler board - which I...
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    I was wondering if there was a further...

    I was wondering if there was a further improvement that could be made to solving this problem.

    I have a very similar situation. My Vaillant has Y-plan wiring (i.e. CH and HW heating fed with...
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    That's a relief - I had visions of hearing it...

    That's a relief - I had visions of hearing it running all night. Thanks for clarifying.
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    That's excellent - thanks again. Was there a...

    That's excellent - thanks again. Was there a reason the boiler wiring plug is not in its socket in the photo? I'm guessing that's normally plugged in when in use.

    So I'm assuming the jumpers...
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    That's very helpful - thanks. I was a bit unsure...

    That's very helpful - thanks. I was a bit unsure as the VR33 manual shows the cable plugging into a connector marked X32 on the side of the board whereas the board in my boiler has X31 at the end of...
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    OpenTherm VR33 and Vaillant ecoTEC plus 428

    I have a Vaillant ecoTEC plus 428 boiler and I'd like to use OpenTherm to control the temperature. I have purchased a VR33 module but wanted to check if anyone had successfully used this with my...
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