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We have proven that a low battery causes the offending device to send out garbled messages that overwhelms the radio channel. This then causes a knock on impact on all the comms across the system. In...

The HRxx has no static memory of setpoints or schedules. It relies on the controller telling it what to do. So when you power it up, it defaults to 20C until the next sync cycle when the controller...

@filbert doesn't your boiler have some installer or diagnostic menu that allows you to see Return temperature. It's quote a key data point for the boiler. So it must be there somewhere.

There is very little two way comms between the OTB and the controller. And that's a shame.
Also I am not surprised that some values returned by the OTB are either static or plain wrong. It all...

The boiler's pump will almost certainly be running anyway because that will have an over run on it. But an UFH pump will normally just pump round the manifold, as long as the manifold outlets are...

Evohome will use a 90C flow temp on 100% heat demand, whether that demand is from HW or CH. Hence why I say it doesn't differentiate between HW and CH. HW will only ever go from 0% to 100% heat...

With UFH, what you want is that the UFH pump stays on for as long as possible during the entire heating schedule. But what a BDR91 will try and do is keep turning on and off several times an hour....

My UFH has its own motorised zone valve. So the BDR91 was connected to the zone valve. The microswitch inside the zone valve would power the pump. This was to ensure the pump would only run after the...

Now get ready to get frustrated with the BDR91 and its inbuilt TPI. It will keep switching the UFH pump on and off several times an hour, which is quite undesirable for an UFH system. What you might...

My guess is based on the Vaillant but it will be similar. The Intergas Cylinder NTC will tell the boiler what the temperature of the water in the Cylinder is. There must be some HW settings on the...

Nope,another missed opportunity, even though the OTB is able to distinguish between CH and HW workloads, it doesn't do much with it. Except when heating HW it goes from 10C to 90C demand only....

I absolutely hate that TPI is built into the firmware of the BDR91. It should have been overrideable. Worse still the relay settings available in the Controller then go and apply to all Relays in the...

Not that I can think of, the software now just gives existing installations the option. What we fought for though was the forced DHWP setting that couldn't be turned off. Thank goodness Resideo...

The Evohome now allows you to implement DHWP regardless of the way the system is piped.
You could always implement DHWP with an X plan with a single relay and using a Normally Open Valve.

Being the guy who coded all this into Domoticz, I have some bad news. Evohome uses none of this information! Infact in the latest firmware, it didn't even query for this information from the OTB. I...

In order to use HW priority, you will need BDR91 controlling the HW and CH loops, in addition to your OTB that fires the boiler.

The data in the Fault Logbook device will tell you what the actual fault is.
see https://www.automatedhome.co.uk/vbulletin/showthread.php?6471-Domoticz-notifications&p=46103&viewfull=1#post46103...

Yes I am already on the post 2025 set up i.e. Single FTTP that does both Broadband and landline. No copper any more. And that allowed me to finally say bye bye Virgin. I was forced to use them...

With Vodafone the landline is free. Doesn't cost us anything and we've had the same number forever. We keep our mobile phones downstairs overnight, so in a real emergency the landline is what will be...

I have always used my own routers. But now with FTTP, the phone line is VOIP and Vodaphone won't give out the VOIP details. So currently am stuck with using the Vodafone router, as without it we...

I had to use terminal 7-8-9 in order to get my OTB to fire the boiler. And because that is undocumented, until I figured it out, I had to use the 240V trigger to fire the boiler and my VR33/OTB were...

I'm guessing this interface can only monitor the OT traffic, it cannot actually inject or alter a command? That would require a gateway?

Or just delete the location and repair the installation to the app.

Care to share your circuit and code?

What is the HW Over run set to? Also when you saw the HW temp go beyond the set point, what was the actual Heat Demand for the HW in the settings menu