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Thread: Evohome and OpenTherm Compatibility with Glow Worm Boiler

  1. #1
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    Default Evohome and OpenTherm Compatibility with Glow Worm Boiler

    The following was posted in another thread but I suspect may have been lost in the noise.

    I am considering buying the OT bridge for my Evohome system, however I need assistance in determining if my boiler will be a goer. I have a Glow Worm Flexicom 30 SX. The following states that the boiler is unofficially compatible when using the correct VR33 module:

    https://myboiler.com/opentherm/opent...pable-boilers/

    Further reading from the below article suggests that the compatible module will be a AWB OPENTHERM MODULE 0020036768.

    https://myboiler.com/opentherm/vaillant-opentherm/

    Can anyone confirm either way from the below images of the boiler's PCB if the module is definitely compatible?

    20190616_182808.jpg

    20190616_182914.jpg

    20190616_182816.jpg

  2. #2
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    Hi,

    I have the Glow Worm Ultracom2 30SXI and I decided to try to upgrade to Opentherm based upon the fact that it appears to be an identical boiler to the AWB ThermoElegance 4 and the AWB 0020036768 Opentherm module is designed for the ThermoElegance 3 and 4 range of boilers. I'd seen the information on the myboiler.com site and this had triggered my interest so I took a look at the manuals for the AWB boilers and the Opentherm module. I purchased the AWB Opentherm module and it turned out to be a very simple job to install the card as all I needed to do was remove the plastic mounting frame that came attached to it as the card slid perfectly in a dedicated vertical slot for the card within 24V the controls section! The connections were simple; one plug pushes onto the X40 contacts on the control board and then the 24V connection is made to your Opentherm controller (I'm using the Evohome OT Bridge). Although your Flexicom boiler doesn't resemble either of the AWB ThermoElegance models, it does look like you have the necessary X40 port on your control board. I don't have any pictures of my installation, but I do recall that I had to remember to add the RT link (the 24V one I think) to get the system to work. Oh, and it's all working perfectly!

    Here's the installation manual for the AWB Opentherm module (yes, just 1 page ):
    AWB 0020036768 - 3.jpg

    Hope this helps.

    Dan
    Last edited by DanD; 17th June 2019 at 10:11 PM. Reason: Added attachment

  3. #3
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    Quote Originally Posted by DanD View Post
    Hi,

    I have the Glow Worm Ultracom2 30SXI and I decided to try to upgrade to Opentherm based upon the fact that it appears to be an identical boiler to the AWB ThermoElegance 4 and the AWB 0020036768 Opentherm module is designed for the ThermoElegance 3 and 4 range of boilers. I'd seen the information on the myboiler.com site and this had triggered my interest so I took a look at the manuals for the AWB boilers and the Opentherm module. I purchased the AWB Opentherm module and it turned out to be a very simple job to install the card as all I needed to do was remove the plastic mounting frame that came attached to it as the card slid perfectly in a dedicated vertical slot for the card within 24V the controls section! The connections were simple; one plug pushes onto the X40 contacts on the control board and then the 24V connection is made to your Opentherm controller (I'm using the Evohome OT Bridge). Although your Flexicom boiler doesn't resemble either of the AWB ThermoElegance models, it does look like you have the necessary X40 port on your control board. I don't have any pictures of my installation, but I do recall that I had to remember to add the RT link (the 24V one I think) to get the system to work. Oh, and it's all working perfectly!

    Here's the installation manual for the AWB Opentherm module (yes, just 1 page ):
    AWB 0020036768 - 3.jpg

    Hope this helps.

    Dan
    Many thanks Dan. Very useful.

    I tried to look for an equivalent AWB boiler but it seems the Thermo Elegance is the only system boiler they produce, no versions of which seem to resemble my Flexicom. Unless anyone else can definitively confirm either way, I'm going to leave this for the time being as the refund policy for the VR33 module doesn't allow for it to be returned.

    TM

  4. #4
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    Hello Dan,

    I also have a Glowworm Ultracom but it is a Ultracom 24hxi.

    Iím interested in adding the Opentherm module like you have done.

    If I take pictures of my boilerís PCB, could you compare them with yours to see if they match?

    Thanks

    Richard

  5. #5
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    Hi Richard,

    I've had a quick search and found a few pictures of the card from your boiler and it's not the same as the one in my Ultracom2. The pictures I found look almost identical to the card in the first post in this thread which does have the x40 port (2nd from bottom on left side). I think you'd just have to try a AWB card with your boiler to see if it works as expected.

    Dan

  6. #6
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    Hi Dan,

    Thanks for replying to me, sorry it has taken me time to reply, Iím not very well, sometimes my health gets in the way of things.

    Anyway, the PCB board for my boiler is Honeywell part no: 0020023825, a picture of it can be found here:

    https://www.dhsspares.co.uk/product/...in-bmu-1339653

    Is there a way to determine if it is compatible before purchasing it and plugging it in?
    - under the link above, the Ďthis part this fitsí tab lists all the Glow-worm boilers the PCB is for, which doesnít include yours..
    - Perhaps the supplier of the Opentherm card is able to confirm?

    Any other way you can think of determining compatibility?

  7. #7
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    Hi,

    Unfortunately I think you're unlikely to find any information which clearly indicates compatibility and Glow Worm don't officially support Opentherm. Even with my Ultracom2 I had to just rely on the info on the Myboiler site combined with a Google of the manual & innards of the AWB Thermoelegance models which gave me confidence that they were identical boilers and it was worth a try.

    Dan

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