I just took the cover off my existing mechanical thermostat, and it has Black, Brown and Grey wires. Can i still connect a D4 with these wires?

Thank you for your help I accidentally locked mine

Very helpful. Many thanks.

how often do you have to service these?

Very helpful many thanks.

It would be lovely to know how to program it. Just had one fitted in my house and have no idea how to use it. Just turned all radiators off. Seems to work that way!

Very helpful, thanks!

Legend thanks, boxing day with no heating wouldn't have been nice!

Hi can you have 2x HR91 in one room?

This is a great video, thanks for taking the time. When our plumber set up the zones they put two actuators in one zone. We want to separate them out into two different zones. How do we do that? Is it a case of deleting the zone and starting again or can you unbind actuators from a zone. Thanks.

Do you know how to fix when the baseplate won't turn when removed from the radiator? I asked my husband to change the battery and suddenly it's broken 🙄 he removed the entire valve and now I can't get it back on

Does this modification only work with the Worcester 4000/8000 Series? I have a Worcester Greenstar 30i System ErP and tried the 10k resistor but no effect? I've had a look at the installation manual for the diverter valve and all I can see is the cylinder temp sensor is required so not sure why the resistor trick doesn't work on the 30i?

Do you need to fully open the black hand wheel for all HR92s?

If only all tutorials were this clear and straight to the point 10/10

Thank you for that video,I'm a plumber but first time using this stat and hadn't realised its intended to pair with the existing bdr91 receiver,second attempt at your instructions and a system boiler set up I installed a few years ago is all now up and running again thank goodness. Merry Xmas to you 👌

I have this thermostat, is there a way to hardwire it so I won't keep going through batteries?

What’s the lead on bottom of receiver for

Absolute lifesaver thank you!

Thanks Rich, what kind of controllers can we use for this actuator, only ESBE or other brands also?

Can you connect this to the resido app so I can control temp away from house ? If so how please

Hi is there a way to keep the display luminated constant or a model similar so it stays on cheers

Hi, can you point me in the direction of the follow up video to this please? Having issues syncing and setting zones from the hcc100 thanks

How do you turn it off?

I think you slightly over simplified the wiring. Because, as we know, when lots of plumbers did their own wiring they used twin & earth & used the earth as the switched live. After all, the earth post on most ( not all) stats is just somewhere to tidy the wiring. I,m not nit - picking, but it is still very common in older properties.

Legend

Hi mate, I currently have a mechanical dial thermostat. It has 3 wires, a red and blue that are attached and a yellow wire that isn’t attached. What is the yellow wire for?

I (as a home owner needing a new hot water tank) was talking to an installer who was suggesting a Mixergy cylinder to pair with my boiler and evohome system. Thanks for posting a solution. To be honest though this looks experimental enough that my thinking is to get a more conventional unvented cylinder instead.

This is a very fortuitous video! Am needing to reconfigure an existing 42CDi that was previously just heating radiators and on demand DHW to heating (a) Multi-zone water UFH, (b) Solar Mixergy (sourced from MWPHS) and (c) existing radiators. Also need to add unrelated electrical UFH bathrooms to a family friendly control interface. Been looking at HA/Zigbee etc, but needs to be maintainable without a domestic nerd. After scouring the Internet now looking at the Honeywell HCC100 and EvoHome combo. So much reading, so many questions... you think it's a good match?

I know right ? Richard! How many requests do you need to do a ‘how to make it work’ vid so we can all get to grip with this tech courtesy of you ? Please ! Soon. 😂

Thanks to you I was able to repair the wireless thermostat.... 🙌🙌

After watching your excellent video I felt confident that I could tackle replacing our two old Danfoss RET230P thermostats and was expecting it to be straightforward but alas not!! As advised, I made sure that the Danfoss thermostats were working properly. On removing the thermostat cover I established that the wiring to the Danfoss was as follows; Neutral/Blue to Neutral connector; Live/Brown to the Live connector; a short red wire from the Live connector to the COM connector and the Earth was wired to the ON connector. On the DT4 I have made safe the Neutral, put the Earth to the B connector and put the Live to the A connector. The thermostat doesn't turn the boiler on or off. Fortunately, I didn't change both thermostats so at least we still have some central heating. Grateful for any advice how to resolve this issue. I do have a photo of the Danfoss wiring but I don't know how to upload it to here.

Hi Richard, great videos thanks. I would like to use my EVOHome controller to act as a room thermostat for the room it is locate in, but can't find how to do this. Can you advise please? Yes it is in the same room which has two radiators, both with HR92s

I have the Honeywell Home pro series do you have a quick fix for that one?

This thermostat is a complicated,impractical pile of rubbish.Its an absolute nightmare to use.I agree with all the comments posted

Hi , ive tried replacing my mams thermostatt with this , she had a danfoss programmer with statt aswell , done exactly what you did in the video and it doesn't do anything , doesn't fire up when statt is turned right up, any help is appreciated , thank you

Great video. I have a dratec combistat which needs replacing with digital. Presume it would be very similar process. Do you know if the Drayton digistat or honeywell stats would be similar fitting as well?

Hi my Honeywell home DT4R thermostat will not connect to the box on the wall it don't come up with 1 comes up with zero please help thank you in advance Phil from Cornwall

Hi, Helpful video thanks. If you have a system with more than 12 zones I understand you can link a second evohome controller for and additional 12 zones. Do you know how this looks in the app? Does it come up with all 24 zones together or is it in different areas in the app etc? Thanks

Thanks for such a helpful video. Do you know if Mixergy endorse this and is there any impact on the cylinder warranty?

best video on yt, saved us!

I have this system but the screen on our thermostat bit is really dull. Can I just buy another thermostat control and bind it to the receiver?

Hello- great video. I have BDR91 with a CM927. The CM927 is broken. My boiler runs on oil. What unit would be compatible with my BDR91? Is there one that would work with the phone app. Ideally I want to leave the BDR91 in situ and just re bind the wireless unit. Thanks

would i be able to upgrade from a Honeywell BDR91 Wireless Relay + cm927 thermostat to meross - MTS200 Smart WiFi Thermostat ? would like to be able to control my house heating when at work so the house is warm when we get in

What a great demo video! Do you know if the wired version, the DT4 thermostat, can also be linked the same way to the evohome? btw, which is the morel of the other thermostat which appears behind the HR91 , is it wired or wireless?

Excellent explanation on how to install & configure 🙂 ... Now it keeps me wondering what happens to the HR92 actuators whenever the T87RF signals it has reached its set temperature level. Would the HR92 then be activated to completely close? And vice-versa: when T87RF needs the system to provide energy (warmth), would then the HR92 go completely open again? It would seem to me that this would consume a lot of battery power on the HR92 ... Any such "technical insight" would be much appreciated ;-)

I HATE this thing!!!!! Do not buy it it’s awful to use and has ZERO instructions and limited info online, the temp sensor is off by miles too

Thank you so much! The Honeywell instruction manual which avoids using words where ever possible, complicated words words like 'press and hold', needs a manual to understand the manual.

Hi there! I have an evohome controller with radiator valves (hr91 and 92s). I have rooms with radiators and underfloor heating combined. It is possible to to set up mixed zones in the evohome controller with radiator valves and underfloor heating zones of the hcc100?

I have a Honeywell T40 clicky stat, can I replace it with a receiver for the DT4 RF and is the wiring the same?

Hello. My Honeywell thermostat shows 25 Celcius. But my calibrated thermometer shows 23 Celcius. How can I make the temperature adjustment?