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  1. Replies
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    An HR92 or other sensor with a low battery can...

    An HR92 or other sensor with a low battery can result in comms interference, jamming other devices.
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    Sounds like it may be losing RF connection and...

    Sounds like it may be losing RF connection and operating in fail safe mode. I am unsure whether this would show up in the Fault Log.
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    Is the BDR91 LED red when this happens?

    Is the BDR91 LED red when this happens?
  4. I have a large open plan setup almost identical...

    I have a large open plan setup almost identical to that. It’s large enough that I can set different temperatures in each zone (Lounge > Kitchen > Hall) and works well.
  5. Maybe it was a DNS issue on the VF network,...

    Maybe it was a DNS issue on the VF network, looking up the IP address, or routing to it.

    With this resolved your controller is now accessing the correct IP address.
  6. What boiler do you have? The OTGW may be...

    What boiler do you have?

    The OTGW may be handling a command that your boiler doesn’t support properly.

    Examining the OTGW message log should help identify this.
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    I use Optimum Start/Stop and Warm Weather Saver...

    I use Optimum Start/Stop and Warm Weather Saver with my 19-zone UFH.

    They work well. I have compromised on a max 3-hour start, some zones do take longer to heat.

    I find Optimum Stop will stop...
  8. Does this link work for you? It works for me. ...

    Does this link work for you? It works for me.

    http://104.209.185.251/WeatherAPIProd/api/weather/current?appKey=b9db7a3d469892e8&language=en-us&locationKey=50104_PC

    I got the clue from here,...
  9. Replies
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    Are you seeing the kitchen actuators open for a...

    Are you seeing the kitchen actuators open for a few minutes then close for a few minutes then open again? This is TPI control, which should stabilise the temperature.

    Your percentages are quite...
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    Are you seeing the HCC80 perform TPI on the...

    Are you seeing the HCC80 perform TPI on the Kitchen actuators? So for 70% demand you might see it on for say approximately 8 mins and off for 4 mins.

    When the kitchen reaches 21C what % demand...
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    So for the Kitchen zone, you have the setpoint at...

    So for the Kitchen zone, you have the setpoint at 23C permanent and it’s maintaining that temperature.

    But you mentioned limiting that zone to 21C max? In that case you shouldn’t be able to set...
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    Take a look at your manifold and check the...

    Take a look at your manifold and check the actuators for kitchen and dining room are working properly.

    Set the kitchen to a low temperature, and all other zones high temperature. The kitchen...
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    Latest controller and 02.00.19.33 App software,...

    Latest controller and 02.00.19.33 App software, 02.00.17.00 WiFi software
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    It went down to -8.5C

    It went down to -8.5C
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    I’m seeing it go lower, -6.5 and still...

    I’m seeing it go lower, -6.5 and still decreasing. There is a bug with the controller display, -x.5 temperatures are displayed correctly, whereas -x.0 temperatures are displayed as 99C.

    Will...
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    It’s reading -0.5C. I can put one in a freezer if...

    It’s reading -0.5C. I can put one in a freezer if you want me to check how low it goes.

    Lowest set-point/off is 5C.

    I’m just using HR91s as temperature sensors in my garage, cold store and...
  17. Replies
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    I use a spare HR91 to monitor temperatures in an...

    I use a spare HR91 to monitor temperatures in an outhouse. I’ve added as an electric zone. With no heating I’ve seen -ve temperatures reported this week.
  18. I use one of these: ...

    I use one of these:

    https://uk.rs-online.com/web/p/power-relays/1218077

    Bruce, it is possible to bind multiple BDR91s to one function.
  19. It doesn’t. Evohome is reducing the time it is...

    It doesn’t. Evohome is reducing the time it is heating via TPI resulting in lower zone temperatures.
  20. It will automatically modulate its output based...

    It will automatically modulate its output based on the return temperature. If the return temperature is higher less power is needed to maintain 65C flow temperature.
  21. I’m assuming that as you don’t have OpenTherm....

    I’m assuming that as you don’t have OpenTherm. the average flow temperature is achieved via TPI cycles. Your boiler is still trying to heat to 65C each time it fires, so it may be more efficient to...
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    I suspect you are seeing Evohome switch to...

    I suspect you are seeing Evohome switch to OpenTherm on/off load control setpoint/10C because your boiler is exceeding setpoint+threshold and cutting the flame.

    This can happen if you are heating...
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    It’s a Vokera Unica 36HE. Not my choice, had an...

    It’s a Vokera Unica 36HE. Not my choice, had an Intergas before I moved, but I worked around its limitations with my OTGW firmware
  24. My boiler’s minimum flow temperature is also 40C...

    My boiler’s minimum flow temperature is also 40C but I have UFH.

    OpenTherm requests flow temperatures down to 20C, which are serviced at 40C.

    In an attempt to be more energy efficient I wrote...
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    The OpenTherm bridge reads the boiler CH setpoint...

    The OpenTherm bridge reads the boiler CH setpoint boundaries and ranges the control setpoint (flow temperature) based on the upper boundary.

    Control setpoint = 20C + % demand * (Max setpoint -...
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