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So, I think I have this wrong.

I assumed the green light is on all the time to indicate it was on and working.

However, I think I am wrong. The green light only comes on when a room is calling for heat? Am I right in thinking that please?

Thanks, Dave

Guys, the house keeps getting cold, so, I go into the boiler cupboard and the BDR91 is off (no lights at all).

So, I push the button and it all fires up fine. In a couple of hours the same thing happens and the pattern keeps repeating itself.

Any help please? Thanks, Dave

Interesting as I am sure mine does this also. I was in the kitchen the other day where the boiler is, no room was calling for heat as they were all set really low. The boiler fired up, stayed up for a very short time, then shut down again. Nobody had turned a tap on either.
I have heard it do it on ...

I have now watched Richard's "TRV compatibility video".

He states that the distance from the top of the thread to the pin must be no more than 14mm. The TRV's with the issues I have are 16.5mm. I guess thats the issue.

Can somebody confirm that there are no fixes for this apart from a new set of ...

Hi guys, I have tried to install my kit tonight. The majority of my existing TRV's are the old Honeywell type. The HR92's slot on nicely and I can manually wind the black wheel down all the way without issue. The body then fits on top and works.

The issue I have is with some other TRV's that are ...