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Thread: Evohome & BDR91 issue

  1. #1
    Automated Home Jr Member
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    Default Evohome & BDR91 issue

    Hi - first post so be gentle

    I have had evohome for 2years ish, trouble free and itís a great system. However...

    Yesterday my wife noticed that the controller was showing temps as per schedule as normal but no rads on.

    Since then Iíve unbound and rebound the BDR91, communicates no issues, triggers the BDR on and off on request. The problem is that when prompted the BDR91 does not fire the boiler, this started as of yesterday on my second schedule, the house was warm as normal in the morning but then nothing

    The boiler, Worcester combi, fires and heats manually but not when requested to by evohome

    Any ideas, canít see any specific issue here on forums or google. Iíve called Honeywell who said ďas itís communicating with the BDR then we canít helpĒ :/

    Thanks in advance

  2. #2
    Automated Home Ninja
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    Is the BDR controlling the boiler directly, or is it controlling a zone valve?

    If it's controlling the boiler, it could be there's a problem with the wiring, although it seems unlikely.

    If it's controlling the valve, and then the valve is controlling the boiler via the orange wire and the microswitch, then I'd guess the microswitch and/or the valve has given up. Do you hear the valve open when you turn the BDR on with the push button on the front?

  3. #3
    Automated Home Jr Member
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    Looks like the BDR is connected direct to the boiler...?

    If I Turn the BDR on manually and the boiler at the on position nothing happens. Green light is solid on BDR

    Press the timer wheel down (at the correct time obviously) whilst boiler @ the on position, boiler fires up and heats whole house

    Evohome still works and shuts on/off each TRV when scheduled

  4. #4
    Automated Home Jr Member
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    If I press the BDR button when boiler is in the on position (no timer) there is no noise or action at all, I can hear the click on the BDR.

  5. #5
    Automated Home Ninja
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    I'm afraid I don't know what a timer wheel is. You shouldn't be needing to mess with switches on the boiler to get it to fire up.

  6. #6
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    My explanation of timer wheel is the old school push in timers - where you would manually set by clicking a time you wanted heating on/off

  7. #7
    Automated Home Legend paulockenden's Avatar
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    What's your system configuration? Combi / S-Plan / Y-Plan ?

    (Do you have any two or three way valves) ?

    P.

  8. #8
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    Combi

    Not sure on the valves, definitely not an expert in this area

  9. #9
    Automated Home Legend paulockenden's Avatar
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    Not an expert either, but I think with a combi system it won't be the microswitch on the back of a 2 or 3 port valve, as @dty suggested.

    Unless you want to start checking voltages with a multi-meter I'd suggest that your best course of action is to call back whoever installed the system for you. With any luck you'll be able to combine it with an annual boiler service and save on the call-out costs!

  10. #10
    Automated Home Jr Member
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    Thanks - boiler does work perfectly on timer but not when just turned on or via evohome..

    Evohome works perfectly communicating with the BDR & HR92s, strange

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