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Thread: Evohome Installation help

  1. #21
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    Quote Originally Posted by sh4d0w View Post
    Fabulous. Thank you my mate.
    Just had to turn my boiler off!
    Seems to be all working ok and then I walk downstairs and it’s like an oven.... heating is on at nuclear temperatures. Couldn’t touch the rads. Checked the evohome screen and it didn’t look like it was running. Any idea why that might be buddy?
    I’m a bit reluctant to carry on if it’s not working properly.
    Did you remove the 24v link? Check that when Green lights are off on BDR91s there's no demand at the boiler.

    Boiler should only run when there's a Green light on the Boiler Relay BDR91.

  2. #22
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    I didnít go up to check if the green light was on or not. I did remove the link and bus. Iíll turn it back on again and see what happens.
    Weíre all gasping for air itís that hot now. Oops

  3. #23
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    So something is wrong... turned the boiler back on and started firing straight away. Pumping liquid lava through itís pipes.
    Checked and there is no green light. The tap light was flashing on the boiler and not the radiator if that means anything. Not sure how it would though.
    For testing purposes I have just manually opened the valves. Could be that the hot water was calling for heat? But still.... my boiler was running at 100% and the green light on the boiler bdr was NOT on.
    The highLimit thermostat is now wired in.

    The Evo home cylinder thermostat is now wired in to the pocket and I have paired it all together.

  4. #24
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    Quote Originally Posted by sh4d0w View Post
    So something is wrong... turned the boiler back on and started firing straight away. Pumping liquid lava through it’s pipes.
    Checked and there is no green light. The tap light was flashing on the boiler and not the radiator if that means anything. Not sure how it would though.
    For testing purposes I have just manually opened the valves. Could be that the hot water was calling for heat? But still.... my boiler was running at 100% and the green light on the boiler bdr was NOT on.
    The highLimit thermostat is now wired in.

    The Evo home cylinder thermostat is now wired in to the pocket and I have paired it all together.
    If the tap symbol is on the screen it means the Vaillant controls are still in control - as it's requesting a DHW rapid reheat. With EvoHome you could only ever get a Radiator symbol on the screen as it can't define between the Rads or DHW reheat on the cylinder.

    Maybe check your wiring again? Have you removed all the Vaillant Controls and the Wireless receiver out the front?

  5. #25
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    Yep. All removed. There wasnít actually the controls pan in the front, it was a dummy blanking panel, The thermostat receiver is actually in my airing cupboard on the landing connected to my boiler via the two core bus.

    The only thing that I havenít disconnected is the temperature probe that was inside my cylinder pocket This probe runs direct to my boiler and connects up on that chockablock.with the two cables.

    Perhaps itís that in the way?

  6. #26
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    Quote Originally Posted by sh4d0w View Post
    Yep. All removed. There wasnít actually the controls pan in the front, it was a dummy blanking panel, The thermostat receiver is actually in my airing cupboard on the landing connected to my boiler via the two core bus.

    The only thing that I havenít disconnected is the temperature probe that was inside my cylinder pocket This probe runs direct to my boiler and connects up on that chockablock.with the two cables.

    Perhaps itís that in the way?
    Yeah when I said remove all Vaillant controls I did mean everything, including the probe.

  7. #27
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    Yep. Noted. It was an oversight. Once removed it did then seem much better behaved. The tap symbol disappeared exactly like you said.

    The boiler then fired up only when the green bdr light was on. BUT, it didnít seem to respond to the controller. When I turned the heat up it didnít trigger the boiler.

    Will have another go this morning and see if it works.

    Thanks again

  8. #28
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    Hello again,
    Day off yesterday as it my youngest's 8th birthday.

    Had a few hours spare today so ive wired it all up again and installed 10 HR92's.

    Hot water seems to be working spot on, when in schedule it calls for heat and it all kicks in fine and hot water thunders through, albeit an awful lot hotter than when using my Vailalint controls, i guess that is modulation for you , what i have found with this though... once it hits target temp the valve doesn't shut off and my boiler continues running, why would this be?

    More importantly and most annoying is my controller talking to my HR92's, this has a total mind of its own, sometimes its slow others its none existent, i have 5 HRs on my test bench with nothing around them all 50 CM apart and my controller next to them, then i have the other bunch fitted to rads.

    1) I go to the RAD and manually turn the HR head and i can hear the motor open and i get instant heat flow, 6 seconds later my controller will update and show the new change.
    2) from my controller i go to the zone and cancel override and/or change the heat setting and this does NOT report back to the HR - the ODD occasion maybe 1 out of 10 attempts it will do .
    3) From the HR head if i change the temp setting a degree another 6-8 seconds and the temp on my controller changes but FROM the temp on the head not the controller.

    It seems a one way street here.

    From my phone app if i change settings it also does not seem to report this on the controller yet sees my zone data.

    Now, if i go to the RF Comms Check and run a scan for the Heat demand it comes back Good, for Hot Water it comes back Excellent AND then if i test each of my HR's i get Not Received - is this normal? BUT then if i hold the button in on my HR and set it to "Binding" i get a response as Excellent.

    I am beginning to have doubts on my £1100 investment now.

    Can you help me please?

  9. #29
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    furthermore, i have just been testing some more, i set all my RAD's to 25C, waited 15 mins, went to check and they had all updated from my controller, went to my zone valves and locked open the downstairs and it worked, one thing i noticed at the same time is the DHW valve was also open and water was passing through, or so it felt. I will double check the wiring of this tomoz but for now i have powered it all down again. Before i did that i went into my loft and checked the BDR, it was green and my boiler was happily doing its thing, i set my controller to "heating off" and after 10 minutes there BDR was still green.

  10. #30
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    Here it is, i have not wired in my two CH Zone Valves at this point for testing purposes, they are locked open manually with lever switch, once i get the system working as it should then i will take brown (live) from both CH ZV back to my CH BDR "B" / 4 UNLESS my wife says she would like the two towel rads heated whenever there is a DHW demand then i can leave them in manual switch OR i guess i could have UPstairs ZV wired back to 8 and Down back to 4 - Unless i have it all wrong?
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    Last edited by sh4d0w; 18th June 2020 at 01:24 PM.

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