Thanks John, you helped me to realise that the three cables entering my programmer box were the three-core timer-power cable, the power-out cable going to the boiler, and a three-core cable consisting of neutral and yellow cores from the room thermostat, and a red core from the cylinder thermostat; rather than the advice that I had received from the electrician who had fitted the previous programmer, that they were a power cable, a cable from the room thermostat and a cable from the cylinder thermostat. No wonder I kept blowing fuses as I replaced the old timer with one which would control the water and the central heating separately. Oh what fun I had as I vaporised the neutral core on the power-out cable! What pretty flashes it made! I was so happy that I only burned out the switch on the fused-spur! Thanks once again for such clear expositions of all things electrical.
You really shouldn't be messing with stuff you do not fully understand, you'll either hurt your self or someone else, get someone in that is qualified for your own sake.
Thanks JW. My mother had been without central heating for the last 2days. Today the heating engineer didn’t tun up. Your videos helped me when I was training to become an electrician. And they have proved invaluable again. After searching in vain I came across this video and was able diagnose the problem in minutes. And restore heating. Thank you again John. Please keep making videos.
Exemplary video - Clear, unambiguous commentary combined with great diagrams. I went from being unclear on the operation of my system to understanding the totality after one viewing. This sort of clarity is unfortunately incredibly rare on TH-cam (and elsewhere). It is rare because it is very difficult to make things appear simple and straightforward while covering the subject comprehensively. Well done and thank you.
Thank you John. Your explanations and diagrams are very clear and easy to follow. I really appreciate your explanations. When the wiring diagrams are seen here, they look so easy! Definitely not the case in reality. 🙂 Thank you.
Excellent video. I'm new to the industry and currently on intense training course to be a gas safety engineer. Did this same topic in class yesterday and couldn't get it round my head. This video has helped my understanding greatly and the way John does the presentation is excellent and his calm voice helps. His videos will be my reference during my course. great job!
Thanks as always for providing these guides. They are perfect, unlike every professionally or DIY system that i encounter each time I move house. I spend a day wondering how on earth any of it works, draft countless schematics, then remember your channel and suddenly I am able to understand the bodge before me and rework so it's closer to standard. This time we have 30 year old house (was the show house) where mains and the boiler wires start at the programmer and the room thermostat is fitted to it too. Thanks again John for preparing, producing and sharing. Very much appreciated.
Excellent and very well explained as always. Helped my fix a overrunning pump issue - turned out to be a faulty valve exactly as described in the video.
Great Video, very well explained. Really liked the way you explained the reason why the external motor remains on for a while before going off. Excellent. Well Done JW
Well done John, again you saved my life, Had a Cowboy plumbing moving my boiler but after he wired it did not work, Only to find he had his own way of wiring it, So I pulled all down and followed your Video ,AND ALL WORKS, Thank you again for the Video.
Best video I have seen on this, by far. I only wish you had produced it before last winter when my 3 way mid position valve decided to go on strike. I know that particular valve is just a combination of the two you have shown but working out how it worked with the other components and what the fault was caused me no end of problems. It was a faulty actuator head on the valve (only a year old) . The symptoms were no central heating unless the tank thermostat wanted the tank heating.
Brilliant and very clear, as an electrician I had never worked on central heating wiring, this did validate the fault diagnosis that I had made for my own house.
Great video explaining everything in simple steps to build up the full picture. Removing some of the common wiring to show how the system works and common faults was very useful. The clarity, simple plain English explanation and build up, one of the best videos I've come across. Hope you can update it with new hive connections on combi and system boilers.
Great video, going in for my am2 in a month and wanted to know how the wiring all works instead of just following a diagram, your video is perfect to learn from as the step by step really helps, massive well done
This video is better, much more understandable thanks to the brilliant diagrams, excellent work John, bit lost before watching this video good work, thank you.
Thanks John, I fitted my system many years ago now wanted to replace the cylinder thermostat . Your vidio and explanation refreshed my memory regarding what wire fed what as this new themostat only has three teminals.
Hi John, I am learning electrical insulation and found your videos highly useful. In regards to central heating wiring system, if I could kindly ask you to produce newer video. Because I found your recent works much more easier to understand. Love you a lot and thanks for making difference.
Thank you for this video. It saved me a lot of heart ache. Had a faulty valve which kept the boiler on and when I went to replace it. It turned out the person who had done the installation had put the two thermostat in series on the heating system and none for the hot water 😳
Thank you John, probably far more information here than I needed to know but like others visited to check programmer compatibility with a Nest or Hive. Cheers for an excellent video
John, Thanks for another amazing video, I have been following your channel for a long time and love your videos, I have just realised how easy it is now going to be for me to automate my central heating system using Arduino and make it work with my planned home automation system that I am currently planning to build. Thanks so much
Thanks for the upload, I’m an electrician and my workplace refuses to give me more experiences. So 1st fixers are always 1st fixers, 2nd fixers are always 2nd fixers etc, they do this to prevent you developing the abilities to become self sufficient and leaving for better pay. I’m one of the few allowed to do a larger mixture than *just* that, but they refuse to let me learn heating systems or industrial aspects of electrics. I can’t stand not learning anything new. Don’t know if this is common practice but it’s annoying as hell. There’s some lads who have 15 years more experience than me but have never tested an installation or second fixed a fuseboard.
Great video,very clear and easy to follow, I used it to build a 2 zone central heating, and megaflow hot water system as a separate zone, in my new but old house👍🏻😊👍🏻 cheers JW
Yeah, i'm a sparky and learning plumbers wiring for a private job... Hope i have it complete since i am half way through. A personal message to Mr Ward, sir! you have been absolutely amazing with every video i have ever watched from you. Every problem i have landed into, i usually search youtube but the search is a bonus when ever i see you pop up because i know your explanation will get through to my slow brain.
S- plan systems are the most simple to install, understand and wire and they are usually the only sensible option if you have more than one heating zone. They are also preferred option for systems with unvented hot water cylinders because if the cylinder overheat stat trips, power is instantly disconnected from the valve and it closes
I like your videos and the way that you explain things that become so obvious after your explanation, I wonder if you could do a video on wiring centres for underfloor heating and how do they go with the s plan wiring. keep it up
John...That was excellent.......I know exactly where to check now.....My central heating was not switching off with the timer removed so it looks like heating control switch that is faulty.......Many Thanks.....
By far the best video on TH-cam explaining s plan wiring . Very helpful .
Thanks John, you helped me to realise that the three cables entering my programmer box were the three-core timer-power cable, the power-out cable going to the boiler, and a three-core cable consisting of neutral and yellow cores from the room thermostat, and a red core from the cylinder thermostat; rather than the advice that I had received from the electrician who had fitted the previous programmer, that they were a power cable, a cable from the room thermostat and a cable from the cylinder thermostat. No wonder I kept blowing fuses as I replaced the old timer with one which would control the water and the central heating separately. Oh what fun I had as I vaporised the neutral core on the power-out cable! What pretty flashes it made! I was so happy that I only burned out the switch on the fused-spur! Thanks once again for such clear expositions of all things electrical.
You really shouldn't be messing with stuff you do not fully understand, you'll either hurt your self or someone else, get someone in that is qualified for your own sake.
Thanks JW. My mother had been without central heating for the last 2days. Today the heating engineer didn’t tun up. Your videos helped me when I was training to become an electrician. And they have proved invaluable again. After searching in vain I came across this video and was able diagnose the problem in minutes. And restore heating. Thank you again John. Please keep making videos.
Exemplary video - Clear, unambiguous commentary combined with great diagrams. I went from being unclear on the operation of my system to understanding the totality after one viewing. This sort of clarity is unfortunately incredibly rare on TH-cam (and elsewhere). It is rare because it is very difficult to make things appear simple and straightforward while covering the subject comprehensively. Well done and thank you.
Thank you John. Your explanations and diagrams are very clear and easy to follow. I really appreciate your explanations. When the wiring diagrams are seen here, they look so easy! Definitely not the case in reality. 🙂 Thank you.
Many Thanks John for saving me a lot of time trying to work out the wiring plan for my 40 year old boiler.
Never fails to explain it extremely well. I nominate John for an OBE. Can I get a second?
thank god for you john...god knows where wed be without you, clarity, understanding and an ability to communicate/teach
Great video, John. Liked the way you built up the diagrams and also the simplified versions to show when various parts of the wiring were live.
Exceptional clarity, and extremely useful video. Now I understand how my system actually works, and in great detail, so thank you.
Likewise. Thanks very much
@@richie5458 Do you have a telephone number I can contact you on for some help
Thanks a million for this brilliant video, I was able to fix my central heating wiring issue and saved myself £300.
Excellent video. I'm new to the industry and currently on intense training course to be a gas safety engineer. Did this same topic in class yesterday and couldn't get it round my head. This video has helped my understanding greatly and the way John does the presentation is excellent and his calm voice helps. His videos will be my reference during my course. great job!
If only college days were this clear and concise. Fantastic video !!! Thanks you so much. I can now stop pulling out what hair I've left..
8 years ago vid still doing extremely well in terms of illustration and logic, as well as the fault finding tips, brilliant.
Thanks as always for providing these guides. They are perfect, unlike every professionally or DIY system that i encounter each time I move house. I spend a day wondering how on earth any of it works, draft countless schematics, then remember your channel and suddenly I am able to understand the bodge before me and rework so it's closer to standard.
This time we have 30 year old house (was the show house) where mains and the boiler wires start at the programmer and the room thermostat is fitted to it too.
Thanks again John for preparing, producing and sharing. Very much appreciated.
Removing neutral and earth wires made this very easy to understand - great video.
Sorting out problems with an inherited system. this was invaluable. Very clear. thank you
Excellent and very well explained as always. Helped my fix a overrunning pump issue - turned out to be a faulty valve exactly as described in the video.
Great Video, very well explained. Really liked the way you explained the reason why the external motor remains on for a while before going off. Excellent. Well Done JW
Excellent - just how a video should be - clear, concise and no unnecessary information.
Well done John, again you saved my life, Had a Cowboy plumbing moving my boiler but after he wired it did not work, Only to find he had his own way of wiring it, So I pulled all down and followed your Video ,AND ALL WORKS, Thank you again for the Video.
Best video I have seen on this, by far.
I only wish you had produced it before last winter when my 3 way mid position valve decided to go on strike.
I know that particular valve is just a combination of the two you have shown but working out how it worked with the other components and what the fault was caused me no end of problems.
It was a faulty actuator head on the valve (only a year old) .
The symptoms were no central heating unless the tank thermostat wanted the tank heating.
Really, really helpful for documenting the configuration and diagnosing problems on my central heating system. Thank you so much!
Brilliant video for newly qualified engineers. Thanks
Thanks for taking the time to create this John. Clearest explanation I've heard, with good graphics too! Thanks
The definitive video/playlist on heating control wiring .
Brilliant and very clear, as an electrician I had never worked on central heating wiring, this did validate the fault diagnosis that I had made for my own house.
Great video explaining everything in simple steps to build up the full picture. Removing some of the common wiring to show how the system works and common faults was very useful. The clarity, simple plain English explanation and build up, one of the best videos I've come across. Hope you can update it with new hive connections on combi and system boilers.
Excellent , I've just moved house and this is invaluable....Many Thanks
You never fail jw excellent display.
Amazing explanation John. Your electrical signal flow graphics made things really simple to understand. Much appreciated.
Total pro.
Very clearly spoken and described at steady pace.
Tx a mil
Outstanding explanation, thank you for making it so easy.
Great video, going in for my am2 in a month and wanted to know how the wiring all works instead of just following a diagram, your video is perfect to learn from as the step by step really helps, massive well done
Brilliant breakdown of the S plan in full detail 👏👏👏👏👏👏
This video is better, much more understandable thanks to the brilliant diagrams, excellent work John, bit lost before watching this video good work, thank you.
Explaining things simply is an art form!!
Subbed
Very well explained indeed. Spent most of my life doing electricals and I found this excellent. Thank you for your time.
Many thanks JW. Such a great logical explanation in a well illustrated & timely manner. Just brilliant.
Great information. Thanks for publishing this it's a great explanation of how a heating system works.
Thanks John, I fitted my system many years ago now wanted to replace the cylinder thermostat . Your vidio and explanation refreshed my memory regarding what wire fed what as this new themostat only has three teminals.
Hi John, I am learning electrical insulation and found your videos highly useful. In regards to central heating wiring system, if I could kindly ask you to produce newer video. Because I found your recent works much more easier to understand. Love you a lot and thanks for making difference.
clearest explanation I have seen of the 'S' plan.
Thank you. Your videos are not only my guilty pleasure. .. but very educational for me.
They also turn him on
Fantastic as always John.
Fantastically helpful video John, it's helped me diagnose a failed Honeywell valve on the central heating system :)
Great video with really clear explanation. Thank you for taking time to make it!
Best explanation I've seen.
Your a legend thank you…always struggled with heating controls
Thank you! Very clear and concise!
The best video on TH-cam!!!!
Great video John, really informative and you get the information across clearly. Spot on!
Pilaties seated
Great video - explains everything I need to know for my heating controls. Thanks.
Excellent video, very clear, and to the point, thank you
Best Description I have seen, Thank You
Such a brilliant explanation.cheers
Thank you for this video. It saved me a lot of heart ache. Had a faulty valve which kept the boiler on and when I went to replace it. It turned out the person who had done the installation had put the two thermostat in series on the heating system and none for the hot water 😳
Thank you John, probably far more information here than I needed to know but like others visited to check programmer compatibility with a Nest or Hive. Cheers for an excellent video
An excellent video, very clear to understand and exactly what I was looking for. Thank you so much for taking the time to make the video and share it.
Thanks for the video John, I had been struggling with this for a while, cheers.
Very clear & detailed video, thanks you for the explanation.👍🏼
great video and really explains it very well
The best explaination and drawing on you tube. Thank you so much
best Description I have seen, thanks
Great video took me two watches but finally got it has been bothering me for a while
Excellent. Crystal clear.
John, Thanks for another amazing video, I have been following your channel for a long time and love your videos, I have just realised how easy it is now going to be for me to automate my central heating system using Arduino and make it work with my planned home automation system that I am currently planning to build. Thanks so much
Very clear explanation - a great video!
Great mentoring, thank you for taking the time to educate us meer mortals... very useful video, made clear with accurate instruction
Brilliant diagrams really helpful
Thanks for the upload, I’m an electrician and my workplace refuses to give me more experiences. So 1st fixers are always 1st fixers, 2nd fixers are always 2nd fixers etc, they do this to prevent you developing the abilities to become self sufficient and leaving for better pay. I’m one of the few allowed to do a larger mixture than *just* that, but they refuse to let me learn heating systems or industrial aspects of electrics. I can’t stand not learning anything new.
Don’t know if this is common practice but it’s annoying as hell. There’s some lads who have 15 years more experience than me but have never tested an installation or second fixed a fuseboard.
Find another employer.
Well put together. Impressed by drawings etc.. Good job
Brilliant teacher
Thank you the explanation is perfect I hope to see more about Y plan and other central heating wiring diagram.
Y plan video currently being prepared.
Great video,very clear and easy to follow, I used it to build a 2 zone central heating, and megaflow hot water system as a separate zone, in my new but old house👍🏻😊👍🏻 cheers JW
Amazing video you got a great talent after watching this i understand more clearly
Many many thanks for a well presented easy to understand video. 👍👍
Excellent, very very clear, thank you
I do like your videos ive learnt alot from you information is plain and straightforward.
What a brilliant video
Massive help in understanding this before I do my AM2 exam, I never touch heating systems
John. A very informative video. Part of my tool kit now. Many thanks👍
Very good explanation, thanks
Terrific tutorial - many thanks.
Excellent video, very well explained. Thank you
Thats way easier to work on. Thanks for taking the time to post. Subbed
Excellent vid. Just helped me get my Nest Learning Thermostats installed.
Yeah, i'm a sparky and learning plumbers wiring for a private job... Hope i have it complete since i am half way through.
A personal message to Mr Ward, sir! you have been absolutely amazing with every video i have ever watched from you. Every problem i have landed into, i usually search youtube but the search is a bonus when ever i see you pop up because i know your explanation will get through to my slow brain.
There won’t be a better example than this 👍🏻
Brilliant video and so easy to follow I have a great idea of how a s plan works
👍👍 can't wait to see more
S- plan systems are the most simple to install, understand and wire and they are usually the only sensible option if you have more than one heating zone. They are also preferred option for systems with unvented hot water cylinders because if the cylinder overheat stat trips, power is instantly disconnected from the valve and it closes
JW you are awesome!
Excellent video
Very clear explanation thank you
I like your videos and the way that you explain things that become so obvious after your explanation, I wonder if you could do a video on wiring centres for underfloor heating and how do they go with the s plan wiring.
keep it up
Your videos are amazing. Thank you.
Superb video, thank you!
great video John. A+
John...That was excellent.......I know exactly where to check now.....My central heating was not switching off with the timer removed so it looks like heating control switch that is faulty.......Many Thanks.....
this guy is brilliant what a great presentation thank you
Absolutely first class