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Thanks @ericmark and @RandomGrinch - a lot of this is over my head. I'm going to replace the cylinder stat as it's a simple job and only £18. If that doesn't do the job I'm going to find someone else to look at it. Will report back - just so you're in the loop with what the problem is... if I...

Hi @RandomGrinch - in terms of the BDR91, the electrician didn’t know it was there (my fault as I didn’t know it was wired in). Our plumber linked it out. I assume he’s done this correctly. He’s happy to come back to look at it again now we know it wasn’t the Honeywell Powerhead. Are the...

Thanks for the reply. Yes, the water is on when the heating is set to off. The heating doesn’t come on when water is on and seems to be working normally on the timer although we’ve not yet had it on for any length of time to test.

So an update... if anyone is still listening and can offer advice. Plumber replaced 3 port valve motor head during the week and problem still remains - hot water still firing up even when water is off on Hive and staying on permanently. The only time it doesn't heat up is when the receiver is...

REALLY appreciate you walking me through steps to troubleshoot the problem. Turned water permanently on via Hive and water still piping hot. Turned everything off to let water cool down. Swapped T1 wire to L terminal and turned back on (without connecting the receiver front) and boiler...

Thanks for jumping on this. Hive and BDR91 wiring photos attached. Any advice appreciated.

Definitely not on permanent on the app. We got an electrician to do the installation and he says it was essentially a straight swap.

Hive dual controller fitted to replace Honeywell ST9400C programmer and BDR91 wireless thermostat. We have a Worcester Bosch boiler with separate hot water tank (not a Combi). Central heating seems to work perfectly in so far as can be boosted and programmed to come on and turn off via the Hive...