Improve your central heating performance fit a digital room stat

If you have one of the old bimetallic strip manual room thermostats, you can save money on your heating bills by fitting a digital one. Al takes you through the fitting of a new one.
Buy one from my Amazon link here www.dereton33.com/page196.html
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[@jameslambert5803]

Bought and fitted one of these this weekend using this tutorial. In fact me and my wife bought our first home last year and been trying to do most of the work myself, I have used a number of your videos to help me so thank you very much and keep them coming.

[@dereton33]

Thanks James. Al.

[@tonywelch3076]

My mum has this same model. And i cant change any temperature or settings. Any one to help with a model number to a link guide pls

[@Teddibere1]

ABSOLUTELY SUPERB Video!!! I could not believe I had EXACTLY the same manual Thermostat in place as this one and was changing it for the same Digital one as.here (both Honeywell). My Manual thermostat in the hall had stopped working. My good friend and I (both ladies) changed this ourselves, watching this video step by step on my IPad - lol. Procedures SO well and clearly explained. SUCCESS!! Thank you SO MUCH for this wonderful video.

[@dereton33]

Pleased you sorted it OK. Well done ladies, you are so much better at DIY then us men.

[@fixityourself7258]

Excellent Advice! Did this upgrade a couple of years ago following this video, before i was a subscriber and it's saved me a fortune and maintains the room temperature so much better. Would recommend this to anyone still using the old analogue thermostats. Great Channel, many thanks.

[@dereton33]

Thanks for sharing!

[@1977fuzzedup]

Hi, followed your video and swapped over my old bi metallic thermostat to this one and already the house feels warmer and a more constant temperature. Cheers for the video and keep up the good work :)

[@dereton33]

Thanks.

[@user-tc7zl9gl7i]

This gave me the confidence to do the same upgrade, which two days later seems to be working well. You’re a gent, thank you.

[@dereton33]

No problem.

[@tracylewis4385]

Morning can you let me know how to put the ignite flame on

[@Ghostsandbutterflys]

.... A few weeks ago I plumbed in and fitted a new radiator - but it would only get luke warm and not heat up properly - I was about to call in a plumber but I found your video - and it showed me how to ballance the system and it immediately sorted the problem. Now, just last week my old 30+ year Honeywell room thermostat in the hallway stopped working (so no central heating for a week) - so I followed this video and replaced it for exactly the same one in your video following your instructions. Heating now working perfectly again. This is now the second time lately that your videos have got me out of trouble - and saved me having to call in (and pay) a plumber / electrician ..... Thank you so much 👍👍👍 Keep up the good work - saved me a few bob .... small donation sent 👍👍

[@dereton33]

Thanks very much, the donation is much appreciated.

[@davie78sti]

Great vid,just changed the ancient mechanical 4+1 split wire in my flat to the same 2 wire digi style like this though the one I got also had an earth connection so i wired that in as well,within an hour can see the difference in accuracy with boiler on/off times 👍

[@ianto218]

Al - Thanks for a very informative video. Our electrician followed the manufacturers wiring diagram, including using the neutral wire causing the 3 amp fuse in our boiler switch to continually blow. Once the neutral wire was disconnected, the device worked without issue. Your helpful video helped immensely in identifying the problem.

[@dereton33]

+ianto218 . That`s great, pleased to have been of some help.

[@marksutton6428]

Really useful video. Followed the tips and had my new digital thermostat up and running in 20 mins and boiler is now providing heat as required. Many thanks

[@dereton33]

No problem Mark.

[@gratisprince4147]

Thank you Alan for your simple and concise explanation. Allowed me to replace my parents faulty thermostat for this much more reactive product with confidence.

[@dereton33]

No problem Gratis.

[@Teddibere1]

I would like to add a personal THANK YOU to Alan. Wish I had YOU at home - lol. Xx

[@dereton33]

That`s really nice thanks Teddy burr, I keep telling Jan how lucky she is, but that results in a clip round the ear. H ha (only joking)

[@andycarter9845]

Did the exact same switch you outlined here, very smooth, thanks. House much more comfortable now with the new stat.

[@dereton33]

Nice work!

[@tomsmith5456]

Thanks Al , just had one fitted , it’s working a treat , big improvement on the old bi metal one .

[@dereton33]

I found the same.

[@petermcardle2199]

Just wanted to let you know that I had a very old thermostat, older than the one in your video, so I bought the model you used. A friend came to fit it but, even though he's an electrician he didn't connect it correctly. He works on industrial systems so wasn't familiar with this type of job really. I showed him your video and two minutes later it's up and running. Thanks.

[@dereton33]

No problem.

[@amana1480]

Good idea. I do find the front comes off this thermostat a bit too easily though. I have the same thermostat.

[@antlondon2]

Been subscribed for a while. Hadn't seen this video. Wanted to change thermostat today. Found this video. Bought the same one as still available for £36.99. Ten minute job to switch over as needed new holes drilling. Also had red, blue, yellow, earth wires. Followed your advice and worked like a dream. Cheers. 👍

[@dereton33]

Glad I could help

[@ILYWAMBFH]

Hello. Thanks very much for your informative video. My central heating failed to fire at the weekend. Water was okay but the heating wouldn't come on when I turned the thermostat up or put the heating on constant. I ordered the same Thermostat control in the video and fitted it last night using your wiring instructions for the yellow and red wires. Bingo! works fine. So Thanks. Can't help thinking that your very calming voice is also of great benefit to anyone watching these films as most like me will be in some state of panic at the thought of an impending night of minus seven degrees with no heating. Your somewhat soothing manor acts almost as therapy for anyone in such a situation. So much so that the next time I get stressed out I might watch one of your films just for the calming effects despite not having any central heating problem. Cheers

[@dereton33]

Thanks for those kind comments Richard, I am one of those people who rarely gets stressed about anything. Just lucky I guess.

[@SecretOfMonkeyIsland784]

Just spent 3 days in my house at 11c (internal house temp) when my boiler failed at it was -2c out, so i can sympathise how hard that would have been. Winter coat, 2x t-shirts, hoodie, thermal socks and blanket and still cold.

[@darkbyte2005]

Hello del, i found this ole video you done and it gave me all the confidence to install. It was very easy to do mine had the 3 wires. The neutral is actually for the resistor/ Heat Anticipator to make the stat work more accurately as you say within 2 deg rather that yours which is 5 deg. But i see the digital ones know work within 1 deg of accuracy without need for neutral . Once again big thanks to you taking the time making these videos. nice one.

[@dereton33]

Nice work!

[@andybeeley]

Thanks Alan for doing the video, just replaced my old Satchwell thermostat with the Honeywell DT90E, made easy and straight forward.

[@dereton33]

No problem

[@leonbryce8384]

Great video, but as an electrician I do not advise just cutting the earth wire off, sleeve it and pop a wago on. It makes it easier for testing purposes not only that when not connected together you are unable to obtain r1 r2 readings which then can become costly on the customer as it’s not always easy to find 👍🏿

[@dereton33]

Thanks 😀

[@Olivarus238]

I know that this is an old video, but it's nowhere near as old as my Honeywell thermostat. It dates back to 1991 and pre-dates the one that you replaced in the video. So I have just replaced it with DT90E, even though that must be at least 4 years old by now. Thank you for the "If you've got red, yellow, blue and earth" section, because that's exactly what I have. Using the red and yellow stopped me using the blue! It's perfect and working well. Great video!

[@dereton33]

Thanks John.

[@davidfarquhar3917]

Very helpful video. Bought one of these and fitted it today. Glad you mentioned the different wiring colours as I had the alternative version and your guide helped a lot

[@dereton33]

No problem David.

[@pacman4568]

Good video, I have been told the yellow wire and the restrictor has a reduced power connection to the boiler. I was warned should you connect the 240v directly to the boiler you can kill the circuit board in the boiler.

[@Tupperz96]

love these videos :) I'm an HVAC apprentice, and for some reason I just find your videos great to watch.

[@neilsluman8267]

Thanks for this. Was a little anxious about whether this would be complicated but you've shown there's nothing to worry about.

[@dereton33]

No problem Neil.

[@PuckyStan]

Thanks for this. Had one of the manual thermostats. All it did was turn the boiler on or off. With your help changed it over myself. Working properly now. Cheers

[@dereton33]

No problem Anthony

[@Robby334]

After reading the instruction book my mate said let's look at youtube - found this great man helped us enormously thanks so much - following your clips was easier than the instructions.

[@dereton33]

That`s great .

[@benbradley2331]

Brilliant help mate. I had a old bio.metric British gas stat. Plumb shop suggested Drayton turn dial stat. Fitted it. Wouldn't even tell boiler to come in... Reason. Has relay that needs 240v in my red wire i only get 190v. Dont know why. But i went out and bought this honeywell u have. Works a treat. U saved my day. So thank you !

[@dereton33]

No problem 👍

[@terryd229]

Great video although I already had a good idea how to install I still found watching this video helped me. Excellent video well worth checking out before you do the swap.

[@philmanning2549]

just installed one took 10 mins,easy to use too,only prob is although its set to 23c actual room temp is 24c,boiler comes on at 24c even though thermost is set at 23c,.my flat seems warmer now than did before.

[@Teddibere1]

To Fred Turner - I had the same problem as you were having with your OLD thermostat. Alan is MARVELLOUS!!

[@dereton33]

Ha ha thanks.

[@brianp798]

I have also realised that when the thermostat is calling for heat(flame symbol ) the boiler switches off, and vice versa. I think the yellow and red need swapping round?

[@dermotkelly6946]

Hi Al , I have just changed to a DT90E today , from the old thermostat which was identical to your old room stat , at the moment me and the Mrs are just staring at it 🤔, all this technology 😳, but something is happening and the rads are coming on , will have to get one of the kids around for a crash course . Thank you very much for this video things worked exactly as you explained . Many thanks , Dermot Kelly .

[@dereton33]

No problem Dermot.

[@rambo884]

Legend is a much overused word but this geezer is one. I am a DIY disaster but he made this easy and i am now basking in my glory and have some browny points with the wife! Keep up the good work mate.

[@dereton33]

No problem Kevin.

[@markpulling12]

Hi firstly thankyou for a great video,ive just ordered a dt90e to replace the exact same bimetalic thermostat, im looking at my wires I have red live ,blue neutral and green earth all currently connected to the old stat,im confused because people seem to say you only connect two wires live and switched live ? what is switched live, you say do away with neutral and earth so do I JUST connect one wire the red live ? thankyou very much mark

[@johnnystromberg]

Thank you! By pure chance I had bought the same stat as you fitted! Perfect instructions... Very grateful

[@dereton33]

You're welcome!

[@executionsquad9998]

Many thanks Al. I have been watching all your videos for the the last few years and I think your fantastic person to give all that free advice and info! I have learnt a lot from you. Thank you very much. I have Vaiilant ecoTec plus 418 boiler and Drayton lifestyle controller underneath . My stat is Drayton as well, does that mean I have to get Drayton digital stat?

[@dereton33]

No, it just means it will be a direct replacement without having to re-drill fixing holes or being a different size and so leaving marks on the wall. You can get any make though that you like.

[@andybell8452]

Al - thanks very much for doing this video - it was exactly what I wanted to do, but had 4 wires originally - needing to go down to 2. All working nicely, thanks to you!

[@dereton33]

Excellent!

[@Andrew-ry7iw]

Brilliant! Way better than my old thermostat

[@executionsquad9998]

thanks Al. Also the Drayton lifestyle controller i have which is underneath boiler ,is the wiring for that striaght forward like the stat on this video. as my one has only one programmable setting for example i could set 2 times a day for only hot water and not central heating. i was thinking of replacing that with more programmable one.

[@dereton33]

Should be the same, but to make sure, just check the forums or contact Drayton.

[@danboulton2128]

Fantastic and really helpful. I bought one of these for our new bungalow but being colourblind, my wife had to help me make sure the correct colour wires went where they come out of! :-) Thanks again.

[@dereton33]

Glad I could help!

[@MrDaveHutton]

Really good video Big Al. Explained in laymen's terms and re-assured me that the neutral and earth wires in my existing EHE 0200155 are not needed. Good stuff 👍

[@dereton33]

No problem.

[@MrDaveHutton]

@@dereton33 I have a separate box that does all the timings. I can set up to three a day. Will there be a conflict with the ability to do the same with this one on the ECO button? I've been trying to get one after I saw your video. Seems they are in very short supply, unless I pay a silly price. Screwfix do them for £34.95, Toolstation £118.98, City Plumbing £108.60 and all prices in between. No stock in Screwfix anywhere near me in South Wales. The cheapest on Amazon is £62. I'll get there, eventually!

[@derekrowlands1189]

Watched your excellent video very informative and very easy to follow, the only problem is I am confused with the instructions, (nothing new there) can you tell me in simple terms how to set a maximum temperature of say 20 degrees, many thanks.

[@dereton33]

Just set the temperature by the push button on the front, that would be the maximum temperture.

[@lewisslade]

Thanks for ANOTHER great vid! Been wanting to change my termostat since I moved in this place 2.5 years ago. My current thermostat has about 5 wires in it! I'm stubborn and don't want to call anyone in...help me?

[@dereton33]

You only need two wires for the thermostat, the live and the switched live.

[@whopaimon5407]

You have helped me a alot doing my own little jobs around the home, thanks Alan

[@dereton33]

No problem.

[@theCybershot123]

Hi nice little video . in the old days the electricians used red/black plus earth cable to wire a stat exactly as you have . Now they have to use twin brown cable I would have put a bit of brown or red tape on the black cable just to identify it being a live cable .

[@TheDoosh79]

+theCybershot123 If he was going to put any tape on then it would be blue, as black used to be neutral, red is the live.

[@theCybershot123]

+Matt Jarrett As I stated the black cable is not a neutral wire but a live conductor so should be identified correctly brown/red

[@Alex-ce6it]

Love the videos.... really well explained and super interesting to watch. Keep up the good work, and keep the videos coming! Cheers. Alex.

[@dereton33]

Thanks Alex, will do.

[@freebornjohn2687]

Great video. This setup works well with a big room and a dedicated pipe run to a valve, but how do you have thermostats in different rooms with individual radiators operating off a single run? Am I missing something? - but the ideal would be an accurate thermostat in each room commutating with the radiator valve in the same room.

[@dereton33]

Yes it would but you will need smart valves for each room and stats, so an expensive option.

[@herbiee22]

Excellent. Thank you. Short and accurate. Sorted out my wiring problem with 4 wires going to 2....brilliant.

[@dereton33]

You're welcome!

[@MontyVideo969]

Thanks for this big Al. Going slightly off-piste but still in connection with saving money . What do you think of weather compensation for controlling gas boiler modulation? More and more boiler manufacturers are doing it? I can't find a video you've done about it though.

[@dereton33]

They seem a good idea. Have yet to do a video on them.

[@happyharry7331]

very accurate thermostat the only downside is it continues to monitor the room temperature even when the heating is off with a loud click when it senses the temperature is low, not a problem if you are in a large house and are remote from the thermostat. We are in a small bungalow and the click is loud I basically turn the thermostat to the frost setting and that stops it. and turn it on again in the morning. Checked this out on several websites and other people also moaning about the loud click

[@dereton33]

Thanks for the info.

[@stephenallaker8101]

Great video, this helped me with fitting mine within a house I've just brought, first house. I could do with a little bit of help if you, or anyone, can spare some. My new room thermistat is set to 18c, which is where I want it, but once it reaches this temperature the radiators don't turn off. I still have to go round an manually turn off all the radiators is the house, but the radiator valve. I thought my thermostat would take over from the valves but it hasn't. Any advise on how I could make this happen. Thank you in advance

[@dereton33]

Check your 3 way valve is working properly. Also that you have wired the thermostat properly.

[@lafemmelaMon]

Thanks Al. Bought one on Ebay and will fit it when it arrives. Happy New Year 2016! and thanks for all the helpful hints!

[@dereton33]

Happy new year to you also. Al and Jan.

[@jasonedwards7831]

Thank you for this, will make my home much more comfortable. Got fed up with getting up and down to adjust the temperature with the 5 degree difference. 👍👍👍👍

[@dereton33]

Enjoy!

[@trevorhawk2000]

Just replaced mine to this model, quite straightforward after watching this video, thanks.

[@dereton33]

No problem.

[@fredturner6535]

thanks very much for your video Alan have just changed mine from a 3 wire 2 wire was a bit nervous turn it back on but all went well think I had a fault with the old one not calling for heating keep the videos coming much appreciated

[@dereton33]

Will do Fred .

[@666pawel]

CLK Products Hi. Was it 4 cables at your? I have the same, so what cables did you use? Thanks.

[@justa1098]

I’m about to replace mine. It has 3 wires, do I only need 2 now then?

[@brianp798]

Hello I have installed this today, I had a red, blue and yellow wire. I have connected red to A and yellow to C. It doesn't seem to be working- the boiler comes on regardless of what I set the thermostat to? Thanks Brian

[@8acv8]

Thank you for the useful comment for the case when there are 4 wires (red, blue, yellow and earth). Only connecting RED in A and YELLOW in B (leaving the other 2 out isolated) works perfectly.

[@dereton33]

Glad it helped

[@GojuRyu1976]

What of you have a brown, blue and earth wire??

[@ReggieChas]

Hi Thanks for your video, really appreciate these videos . My analogue thermostat is terrible. Want to change it but mine also has a yellow wire connected can I leave that one out?

[@ReggieChas]

Watched the video again and paid attention!! Now installed and working. Thank you.

[@allanellis3768]

Thanks Alan for the advice just changed my thermostat EASY!

[@dereton33]

No problem Allen.

[@paimei26]

@@dereton33 did u switch the electricty off before changing ?

[@executionsquad9998]

Hi Al, would you able to advise when during the day and how long the boiler needs to be set to keep a 3 bed house to stay warm ?

[@dereton33]

You could set it for 2 hour intervals but at a lower setting on the thermostat say about 18 or 19 c . Or just leave it on for the day but with the stat set down to about 17 or 18 c. This would insure the house never dropped below that temperature. When you got in turn the thermostat back up, it would take little time to heat the house back to 21 c

[@milesbancroft]

Thanks Al. Another great video. I am going to try the Honeywell wireless one with the separate receiver.

[@dereton33]

Great let me know how you got on.

[@michaelbaines2383]

Great vid, exactly what I need to do in my new property. How does this talk to the boiler? Assume it needs some sort of receiver in the boiler?

[@dereton33]

It just replaces your old wall stat.

[@radumateescu5035]

I have the same problem, but i have different thermostat is Honeywell HCW80 but looks the same almost. Do you think will work to change with the digital Honeywell one. Thank you. Great video!!

[@jpthewidowmaker]

Another great video! Keep them coming!

[@RogerWallis-xn3mw]

Excellent video, extremely useful and clear. Just wondered how you moved the cable to the new hole without it disappearing into the wall as I have the same problem?

[@dereton33]

My wall was excessable in the cupboard the other side of the stat..

[@RogerWallis-xn3mw]

@@dereton33 Thanks for getting back to me, much appreciated. cheers

[@lambal8554]

Greatings from Holland your vid is great and have to say it gives people a bit of confidence to operate it and check your vid for info if they forget how to use it properly. Thanks

[@dereton33]

Thanks Iam.

[@MoreChannelNoise]

weren't the wires different coloured in Holland

[@TheStratCat]

Hi, firstly thanks for this useful video. I have one of these fitted as per your instructions and it seems to work ok. However, as a couple of people have mentioned, it calls for heat when the timer/programmer is off and the room cools. Is that a 'feature' of this model? If so can I assume it's basically a battery operated on off switch governed by the temperature and not affected by the timer/programmer.

[@dereton33]

Yes.

[@yetiibob8407]

Many thanks, just replaced mine and took 15mins! Really clear and precise. 😊

[@dereton33]

You're welcome!

[@michaelbowron3884]

Thanks for this I was really struggling to get this to work until I saw your video and you showed how to lose the neutral as I had 3 wire system it was great especially as this wasn't explained in manufacturers instructions

[@dereton33]

You're welcome!

[@paulsmith4314]

Hi. I've just done the exact same swap. However, my thermostat had resolutely refused to budge from displaying 19 degrees. Does it need calibrating somehow

[@dereton33]

No it sounds like a fault.

[@fevkin]

Thank you very much for that. Can you explain the on/off button on the thermostat. I've been pressing it off when I've felt the room's hotter than I want and pressing again when I want it warmer but I'm really not sure this is it's purpose

[@dereton33]

It is the on or off override.

[@stephengilchrist]

Thanks for the video it was a great help when changing mine over thanks for taking the time to make it

[@dereton33]

No problem.

[@jonock1]

Hi, great video. I'm connecting a Salus Rt310. The wires are Red Yellow and Blue, and the terminals are labelled as COM, NO, and NC. From what I understand the red wire should go to the COM terminal and the Yellow to the NO terminal. So why does it even have an NC terminal if it's not used?

[@dereton33]

No idea, thought it was a bit odd myself.

[@darrenrichards4840]

Thanks for posting a great no fuss video on this.

[@dereton33]

No problem Darren.

[@313keiko1]

Hi great explanation I am actually having problems opening it up so I can wall mount Any help would be appreciated thanks Regards Mike

[@dereton33]

Hi Mike, it hinges up and lifts off, Just stick a small screwdriver in the slot at the bottom, pull away and hinge it upwards and away.

[@johnward3641]

Hi Alan after installing I found I needed a separate relay box as it's wireless. Is there anyway I can bypass using wireless and using this as a thermostat only?

[@dereton33]

You can but will need an electrician to re configure the wiring.

[@perebrine]

Hi thanks for the great video. I have a "Drayton" manual thermostat for my heating, can I swap it for the one in the video, a Honeywell type, or do I need to swap type for type?

[@dereton33]

Yes you can!

[@mattsedge3525]

Thanks for a great video, super clear and very detailed but explained in a very practical way, It was perfect for me as I changed the same old thermostat to the new one fitted in the video so it was word for word perfect! Thanks' again brilliant..... :)

[@dereton33]

You're very welcome!

[@philmanning2549]

BRILLIANT SO EASY TO USE.

[@davelinkson1]

Thanks Al I've had one of these fitted recently by an electrician as he was doing a rewire on my place, but so far it seems unresponsive as it doesn't turn on and off at set temps and doesn't show icon when boiler fires, think I'm going to have to check it's wired right and get my volt tester on it..

[@dereton33]

Yes check it out.

[@davelinkson1]

@@dereton33 it's working now Al, I found blue neutral in B and yellow in C, so I done away with blue and moved yellow to B and now clicking on and off and boiler firing as required. A newly qualified electrician fitted it initially. 🙄

[@Free-iq8ip]

Great video! Only one problem I have, the eco mode turns back to one hour ever time I switch it on, which is very uncomfortable... any suggestions? Or am I too dumb? Greatings from cold Vienna

[@dereton33]

That`s strange mine does not do that.

[@adrianomartorana1616]

That's an excellent video, clearly explained and the the digital one would be perfect. However, I have an older Honeywell T1460 and it has three wires. A blue (N?), a Red (L?) and a yellow - there's also an earth not used. Can I still use the one on your link?

[@dereton33]

Yes it is still fine to use.

[@Dan-mf8jf]

hey Al, love your videos. I have a Worcester greenstar combi boiler, I have a very old fashioned myson analogue thermostat connected to it, looks like it's been there since the 70s/80s. I have had a look to see what wires it has. it has blue wire connected at the top, red wire connected at the bottom and a bare wire connected in the middle. there is a loose yellow wire not connected to anything. so can you just confirm which wires I need to connect to this new unit? is it red in the A terminal and the yellow that is not connected to anything in the B terminal? and the blue and bare wire safely tucked away.

[@dereton33]

Assuming the blue is the neutral then yes.

[@Dan-mf8jf]

dereton33 so connected the red and yellow, wouldn't fire the boiler. wasn't brave enough to try another wire, so got a qualified electrician out, better safe than sorry. after he checked the wiring, turned out it was the blue wire that was the live switch. glad someone professional did it for me. Thanks for you help Al.

[@David-sb7vg]

Thanks for that Al. I bought one based on your vid a few years or so ago and its been great. I have a Honeywell ST699 programmer which had been playing up last year and turning itself off sometimes. This season the thermostat has started clicking constantly now and again until I pull a battery. I'm thinking Ill need to just bite the bullet and replace the programmer?

[@dereton33]

I have a video on a smart thermostat now which is even better.

[@David-sb7vg]

Do you think it’s the thermostat tho Al? I’m presuming it’s the controller as it’s been dodgy for a while. Nearly time to hibernate the scooter mate ❄️❄️

[@dereton33]

I would say it is the programmer. Scooters are getting covered now till next season.

[@David-sb7vg]

Thanks for that Al. It’s been telling me for a long time it’s not happy :) Looking forward to May 2020 :)

[@nigelmartin2248]

A great explanation, nice and simple, excellent! Quick question, in my current unit ( exactly the same as yours) Th current wires are as follows: EARTH x 2 wires, Number 2 slot BLUE wire, Number 3 BLACK wire, Number 1 slot BROWN wire..... Would I be right in the new unit wiring to be: LIVE, into A slot- BROWN, NUTURAL into B slot- BLACK, or BLUE? Any advice guidance would be greatly appreciated.! Again, thanks so much a great source of no nonsense example.

[@dereton33]

Check that neutral with a tester first sometimes the black can be switched mains.

[@nigelmartin2248]

@@dereton33 Many thanks have sorted!

[@chadders71]

Hi, My wires are confusing me. I have Brown, Black, White (with some blue tubing on it) and the earth. Its a combi boiler and I have bought the Honeywell THR840DUK digital thermostat. I am assuming I connect Brown to (A) and Black to (B) and then tape up Blue and Earth. Is that right?

[@dereton33]

Yes, but you can always check it is the right way round with a test meter.

[@peckhamprincess7098]

I have Honeywell thermostat, I didn't know the information you gave as my Mum has the old skool one & it's either too hot or too cold, so thank you as I love my thermostat Now lol :-)

[@dereton33]

Yes it is worth the change Linda.

[@DavidLewis-ev8sg]

Very helpful video thanks very much fitted new digital Honeywell DT 90 eco from my local Toolstation

[@dereton33]

No problem David.

[@davidyelee]

Your video is my only reference and guide. I thank you, once again.

[@dereton33]

Glad to help!

[@markbsac]

ive got a red wire and a blue wire on my old honeywell stat...so im assumeing the blue wire goes where your black wire has gone...i also have an earth connected

[@dereton33]

Yes but if unsure check with an electrician.

[@roybatty2030]

Another great vid, thanks. I’m changing mine tomorrow!

[@dereton33]

Thanks Rus, good luck with it.

[@gibboj]

hi alan love your vid`s thay really help me out when im doing a bit of diy pluming ,keep up the good work atb john

[@dereton33]

Thanks John.

[@David-sb7vg]

Thanks for another great Video Al.....it all went the way you said (never in doubt!) and thanks for the tip on the yellow wire :)

[@dereton33]

No problem David, pleased you sorted it Ok.

[@billyharper1474]

Thanks so much mate. You’ve really helped me out!!

[@dereton33]

No problem Billy.

[@SamAmiri]

Cheers mate, had no clue had to deal with an analogue one but you got me going.

[@dereton33]

No problem.

[@MS-yy2dh]

Only problem I have noticed after doing this is that the boiler cycles on and off a lot more. My concern is that I would have thought continually starting and stopping the boiler (oil fired in my case) might tend to reduce life expectancy. Is there any way to avoid this issue?

[@dereton33]

No really the stat is just being more accurate, turning on and off with just a degree of difference.

[@4_am]

Thanks for this, i was struggling finding the unit name for my thermostat! DT90E cheers for that.

[@dereton33]

No problem 👍

[@T120Mitch]

thank you, mine had the 4 wires and I was able to swap it with your advice.

[@dereton33]

Excellent!

[@graphiteevolutiongraphenom1769]

Informative and helpful as always. Thank you.

[@dereton33]

No problem.

[@graphiteevolutiongraphenom1769]

I've just crossed the wires and the heating does not work. No response of any kind from the boiler. Does that mean a new PCB. I'm told the PCB sometimes has a 2Amp fuse ?