Brilliant. Thank you, all went exactly as you described. 10/10

You're welcome!

Solar gain and low heat loss at this time of year?

Glad it was helpful!

Normally you would use the relay to control the heat source, otherwise the heat source would have to run 24/7 ready for when there was a demand.

No, only when there is a demand from the thermostat.

You're welcome!

I don't, but Resideo technical support is on 0300 130 1299.

No problem!

The DT4 can replace any existing non-programmable thermostat. Unfortunately, I can only comment about the thermostat we used in the video (which is also the equivalent to a Honeywell T6360 clicky stat). The wires that are in wiring terminals 1 & 3 on the existing thermostat, are the live and switched live wires. You use these wire (and these wires only) in the DT4 switching terminals, the rest of the wires are made safe as I've shown. If you need any technical support with the DT4 product, please contact Resideo on 0300 130 1299. Thanks for watching the video.

@@MWPHS I REALLY do appreciate you taking the time to answer. Thank you👍

You're very welcome!

It will but make sure you remove the batteries of of the old CM927 so it doesn't interfere with the new thermostat.

No disadvantage as long as there is an understanding that the shoe is in the correct position when the actuator is fitted.

I am planning a full revamp of all our evohome videos shortly. Full guides for everything evohome start to finish. Watch this space. 👍🏻

Thanks for your input. I'll be honest, I knew this but I'm dyslexic and mixed up the wording on the video. I'll make sure on the next video I use the correct terminology.

Unfortunately you have multiple fail points in a heating system, so its best to call a heating installer to come and look at the system for you.

​@@MWPHS I made it work, but it is weird. On the old thermometer, on your video on number 2 you have blue neutral wire and I have blue and black together on 2, and the new one is working ONLY when those two (blue and black) have contact... So I connected them and isolated them with tape and it's working. No idea why...

The DT4 thermostat is only capable of a maximum switching current of 3 amp resistive. Please don't use 13 amp fuses with these thermostats.

@@MWPHS In short, I inherited electric underfloor heating, but no idea if it is working. The old one is a honeywell t6360 and I would like to replace it but no idea with what and what fuse to use on it.

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The thermostat in this video is wireless, but the one your son has is probably a DT90E. This might help ( support.resideo.com/s/article/Where-can-I-find-the-user-guide-for-the-DT90E-thermostat?language=en_US ).

No, T6 is a Ramses 3 protocol thermostat so only works with the R6H receiver ( www.resideo.com/gb/en/products/comfort/thermostats/thermostat-accessories/r6h911rf4018-2-channel-wireless-receiver-box-r6h911rf4018/ ).

@@MWPHS thank you. I'll be sure to get the complete package to replace the T3r. Thanks for replying 🙂

You are so welcome!

Glad it helped

Glad to hear this Karen! :)

Sometimes, you have to turn the thermostat all the way down and then all the way back up again. Also make sure the thermostat is set higher than the room temperature. If you need support, call 0300 130 1299.

I'll see what I can do! :)

The BDR91 is manufactured in many different shapes under many different product codes, so they won't always look like the one in this video. Essentially they all do have the same PCB, so do work exactly the same as in this video. If you have a look at the video we did 9 months ago (kzfaq.info/get/bejne/qpN2m7KorL2bf6s.htmlsi=xBGuYJCwbxrz4bQO), both the BDR91 and the DT2 wireless relay box (which is essentially a BDR91 with a different plastic fascia) are fully compatible with all Ramses 2 Honeywell thermostats. The DT2 wireless relay box supplied on MWPHS (mwphs.co.uk/product/wireless-relay-box-bdr91-replacement-replaces-all-pre-2021-honeywell-bdr91/) is fully compatible with all Ramses 2 thermostats? What was the problem you had maybe I can look into this for you? Thanks, Richard.

@@MWPHS Hi Richard, sorry if I can't call, but as mentioned to Waseem, I can only send emails when I'm at work. I ordered two BDR91, one from Amazon and one from you. Both are to connect with a DT4 thermostat. The one I bought from Amazon connected straight away to my DT4, the one I ordered from you didn't connect. We didn't install it, no screws, nothing. We did nothing to that receiver apart from trying to connect to the thermostat. I didn't check the receiver when I received it but I only noticed that it was in a bubble wrap rather than in its box like the one I received from Amazon. Waseem said that the box had been destroyed in transit... It's only when my engineer came to install everything that he noticed the difference between the two receivers. You claim that they are the same, they are not or yours is faulty...Waseem or your company keep saying you sent the right receiver but you didn't and that the receiver was damaged or in used condition. If it was damaged, ( I saw the pictures and unless, you look for it, you wouldn't noticed), it wasn't by us! I paid for a delivery postage, a return postage and a receiver that it's either the wrong one or is not working and you're refusing for a refund. As I said, next time, I'll go to Amazon, much easier and they don't blame the customer for things they haven't done.

@@alexojus I had replied to you before realising you had left our business two 1 star reviews on Google and a negative Trustpilot review? I have physically seen the wireless relay box you returned with my own eyes and I don’t think I have seen many items returned to us in such poor condition? It is completely unsaleable. It is now not about the money, it’s about the fact we are being call liars and scammers when we have refused to refund an item that has been returned in unsaleable condition. We are not Amazon, we are a small family owned heating supplier who has been running for 10 years. Some of our items are bought direct from the manufacturer as an OEM replacement. All the wireless relay boxes we supply are checked/picked to order by our warehouseman (who is called Nick, been with us 7 years and religiously checks all items before dispatch) and they are packed in electrostatic packaging to protect them from physical and electromagnetic damage. This is not bubble wrap. If you want the detail on the bags we use they are here ( www.kitepackaging.co.uk/scp/bags-for-electronics/open-top-antistatic-bag/ ). When I get into work tomorrow I will get the DT4R I use for my KZfaq videos and test the wireless relay box you have sent back for operation, however the reason you have given for return was that it wasn’t a BDR91. So is the reason for return that the item is faulty? If that is the case that wasn’t clear from the returns paperwork or discussion I had with Waseem?

This might help (kzfaq.info/get/bejne/a5eYgMKHvsjLeH0.html), otherwise contact support on 0300 130 1299.

@@MWPHS it’s really helped me thank you so much

You can, but bear in mind the DT4 is only a 2 wired connection so you would have to have this appropriately wired to accomplish this.

CM707 is a wired thermostat. Contact Resideo for support on 0330 130 1299.

@@MWPHS so can i connect it then

@@𝖀𝖟4𝖆𝖎𝖗 if you don't know how to do this, contact an installer and they will do it for you.

Hi, evohome and a HM80 (if you can find one) controls mixing at zone level only.

@@MWPHS Ok. That means it is impossible to configure the Evohome to control the 3 way mixing valve depending on the whole house demand ?

@@EtienneL-it2gp why would you have a mixing valve controlling the whole house? A mixed circuit is usually part of more than one zone where the temperature to the one circuit is higher than the second circuit (1x radiator circuit and 1x UFH for example).

@@MWPHS The main 3-way valve makes it possible to precisely adjust the water temperature of the whole circuit according to the needs of the radiators. My installation was designed like this.

@@EtienneL-it2gp ok, well evohome is not designed to work like this unfortunately.

Hi, looking at the Sunvic TLX 2259 the shape looks like it fits a standard UK backplate, so should have similar fixing holes to the DT4. Please note that the DT4R is the wireless version, the product in the video is a DT4 (mwphs.co.uk/product/honeywell-home-dt4-white-wired-tpi-thermostat-dt40wt20/).

@@MWPHS That's great, thank-you.

Glad it was helpful!

So yes, you can add the HCC100 but you will only have the remaining zones on the evohome controller to use, not the full 8 zones the HCC100 offers.

Sorry to hear this. I don't believe the manufacturer fixes these components, however if you contact the Resideo/Honeywell Home support number in your country, they might be able to help you.

Time and temperature control is with evohome, so setback is just a lesser scheduled temperature in another time zone. Evohome has Optimum Start and is better than most systems at regulating air temp between setback and comfort temps.

Might not be the thermostat if the relay box is turned off (green light off). Possibly another component failed?

Glad it helped! :)

These are simply non-programmable thermostats, so no provision for any time control. If you want time control, maybe consider another battery operated programmable wired thermostat like the Drayton Digistat 2290B - mwphs.co.uk/product/drayton-digistat-wired-programmable-thermostat-2290b/

If you have the rectangular receiver the only option is to buy another CM927, but bear in mind these will be several years old now and even if they are new they will be unwarranted. The closest thing to a CM927 is a T4R - mwphs.co.uk/product/honeywell-home-t4r-7-day-wireless-programmable-thermostat-y4h910rf4003/

@@MWPHS the noise seems to come from the cupboard with the boiler. I.e. the receiver part. Also I may be hearing my neighbour's as well! .