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Here are all the types of requests seen by my OTGW. You can see there are a bunch of them with a period of around 1m45s.

The DHW ones are odd, because Evohome doesn't distinguish...

Great. Might be useful to understand typical electricity consumption/costs too.

Bruce, how often does the Evohome controller communicate with the OTB? Maybe that frequency has changed and that influences how often the OTB reads boiler parameters. There are several other...

From my previous house with Intergas boiler. The Intergas boiler returns fractional temperatures, its sensor was very accurate according to my Netatmo weather station.

01:42:24.375260 T001B0000 ...

Yes, that's right, approximately every 1m 45s. It's not OTGW initiated, it is coming from the OTB (T for Thermostat, B for Boiler):

00:01:06.465029 T001B0000 Read-Data Outside temperature:...

It's worked well for me in both a radiator and now a UFH setup. I can hardly believe that the previous owner of my house had the UFH TMV set to 75C with a boiler temperature of 70C. Now, in this...

Out of interest Vaughn, what is your setup? I see myself eventually going down the GSHP route. My house was originally going to have one fitted but the previous owner heard negative feedback from...

Stick an OTGW between the OTB and VR33? That should tell you whether the Domoticz->HGI80->OTB path is working, returning the same value.

We know OTB->Boiler->Outdoor sensor works. The OTB...

Yes, this initially confused me as well. A 10C request is used by Evohome to signify off, but by default, if CH Enable is on, it will be interpreted by my boiler just like any other request below...

Heat Pumps are supported by the latest firmware and new BDR91T

I think it’s displaying the flow temperature request (control setpoint).

So if your current flow temperature exceeds this temperature, the boiler remains off but may continue to pump/overrun for...

So it turns out, after all that, that floor heating mode doesn’t work very well for my setup.

In this mode the boiler appears to reduce its hysteresis from +5/-5 to +2/-2C.

What this means,...

Maybe they changed the firmware, my Nest V2 never pulsed, just appeared to stay off far too long. OpenTherm will improve matters if your boiler is compatible.

Yes, Evohome

There’s an explanation here:

https://support.google.com/googlenest/answer/9250165?hl=en-GB#zippy=%2Chow-true-radiant-works

Whereas with Honeywell TPI where there is a regular on/off cycle when...

I don’t think Nest employs TPI in the same sense as the CM927, switching on/off in 10 minute intervals.

But it’s True Radiant algorithm does learn how long your room takes to heat up or cool down...

I’ve added my OTGW controlled Arduino relay to switch my boiler between standard heating (40-60C) and floor heating (20-39C) modes. Appears to work well.

Conveniently the OTGW has 4 pins above...

What’s worked for me in the past is to go to the mytotalconnect web interface, delete your location and add it again. I think that resyncs.

I think rebooting your controller by pushing the batteries apart should remove the phantom zone.

Vokera Unica, and LPG, unfortunately Bruce. Will probably make do with it until the time is right to fit a GSHP.

I learned that my boiler’s floor heating jumper tag setting is actually dynamically read.

If the jumper is inserted, OpenTherm will switch from a 40-80C range to 20-45C.

So, I’m going to...

For a gas boiler, I would set to 6 cycles per hour, 1 minute minimum.

I can now see how sub-optimum Evohome’s OpenTherm low load control is.

Basically it appears to be invoked if the burner is observed to go out.

But this can naturally happen when, through...

Yes, that’s my concern now too, I am reliant on the OTGW for OpenTherm to work properly. Without the OTGW, Evohome would be attempting to heat my UFH to 80C, as that is what my boiler reports as the...

I had that issue when setting up, a controller reboot by removing the batteries fixed it.