How to Repair a Motorised Central Heating Valve

[Music] hello I'm Roger crispy from skill-builder and I want to begin what I hope will become a series of videos on know your house in which I take you around the house and show you various bits now having worked most of my life as a plumber it's about time I start sharing a little bit about knowledge and experience with skill-builder viewers so I'm going to start here in what is a fairly typical sort of border arrangement we've got a boiler wall hung boiler over in the corner the flow comes up here and it's going through this pump now we know the flows going that way because is a narrow stems on the underside of the pump which shows that it's going along here this is a bypass valve that basically sends a little bit of the water back so that if the pump is running it's not working on a closed system now you normally use that if you've got thermostatic radiators all around the house so you balance that by pascal valve and that's operated on pressure as a thermostatic valve close down this opens up and sends a bit of water back to the boiler you don't get that on all systems but that's just the requirement on this particular system so now we come to this key here and we've got a circuit here which is running along to the radiators that's the central heating circuit and that's operated by this motorised valve we've got another motorized valve down here and the post come is just penciled on it hot water and that is going to the water cylinder now what you sometimes find is that all of a sudden your central heating or your hot water will stop working and you can't work out why you look at the boiler the boilers working but you're not getting any heat through to the radiators or to the waters in there now this isn't always the case but this can sometimes be due to the motorized valve and it is a very simple little job to fix it but you have to know that it's due to that and not something else and I'll show you the way that you do that if this motorized valve is opened if it's calling for heat on the programmer here if we've got that calling for heat this motorized valve will open and you can see this valve the lever on the side will become slack like that and that means that the valve is open on the water you can just hear the boiler start to kick in now and that means that that valve is open and the water is traveling along here to the hot water cylinder now if I turn that off I don't know what are you going to hear this but if I turn that off [Music] I'm hardly hear it but what's happening is that lever is dropping down there now and that's a spring return I was hoping you would hear the spring return this works quite quiet sometimes you can hear them now that valve is now closed so because it's closed when I push that lever up you can feel resistance on the lever and that means that valve is in the closed position now the spring is running it back again so it's actually taking a little while to close file enough but they are it just drops down and that's the spring closing the valve wat so that valve is now closed now if the motor in the valve is burnt out if it's not working you will go to that valve and even though on your programmer you're calling for hot water or central heating you'll push this up and you'll feel resistance on it it won't be opening so that will be the reason that the water isn't traveling through so either the radiators or the hot water cylinder and that's because the motor has burnt out now I'm going to show you how to change that motor very simply I won't show you on this because if I show you on this I'm going to block the camera out so we're going to take that to a bench and show you what happens on the bench but basically you can turn the power off and your muffler and the power off at the mains isolate the whole system so that you're not getting anything coming through because even though it's switched off here you haven't got hot water or central heating selected there is still mains current running into through to that valve and I'll show you why that is I'll show you what that does in a minute when I take the valve apart it's very important that you turn off you completely isolate even take the fuse out to make sure there's no power running through to this valve when you undertake the repair to it and if you're not sure about that don't do it get somebody else to do it but the great thing is that you may have already diagnose the problem so if you do call the heating engineer you can say I think the motorized valve is burned out and that will alert him to bring over a motor with him you should have one probably on the van anyway but if it brings a new motor within changing running off and the bill going up and so and so it's good to know about it's good to have a little bit of knowledge of that now I think at this point what I'm going to do that pipe is running through the cylinder and it also runs back along here the return once it's been through the cylinder it runs back along the Wizards I'm just going to show you that in a diagram so that you can understand fully what's happening before I show you how to change the motor oh by the way one other thing if your hot water does break down and you need an immersion heater there's an immersion heater run by electricity there some people tend to use that in the summer if you've got a big boiler and it's inefficient you can just switch on the immersion heater and you can get hot water it's a great thing because the back-up if your border breaks down or that motorized valve goes you can get yourself hot water just by flicking the switch but don't forget the turn it off afterwards otherwise you'll get very big bills so let's go on and look at how to put a new motor into that motorized valve which is where we started so I'm going to show you how to put a new motor into a motorized valve but we've got to acknowledge where we offer and the great you never very far from a bottle of wine in this business so you don't need to take this valve off the pipe work to sort it out you don't even need to drain the system down it's perfectly safe to work on it so long as you throw any lectures up you can see the warning sign there to tell you that as mains voltage so make sure you turn that off at source at power take the fuse out make sure it's isolated before you do anything but the valve itself can stay intact they used to just have the one school and they've now put another screw so you take the cover off and they've got an earth wire in there onto the cover so just leave that there don't tag onto there and the sink or motor is this thing in the middle and this is the thing that opens the valve up you can see here on the side we've got a lever now when I open that lever up completely you can actually see right away through the valve is open when I do that the spring takes the lever back and valve is closed you can't blow through it so that's basically what it's doing the motor is opening up the valve and if you find yourself without hot water you can manually open this valve just by doing that and there's a little lag for it to sit behind that lever just there and that keeps it open manually which is a great help because if you're without hot water and you can't get anybody to do it or you can't get a sink or motor you can sometimes get yourself out of trouble just by pushing that lever and opening the valve manually you see inside there there's a set of Springs very strong Springs actually and it goes close it off now that shows you how much work that that will sync or motor is doing they're tiny things and when they apply current to them they just continue to were around it's a brushless motor so in theory it should never burn out so I'm not really quite sure what happens to them and why they do go but they do go and it's a very common job for plumbers and electricians to renew this single motor you can see there that the Synchron motor is being held by a screw now it's just a single Phillips screw I'll turn it round so that the camera can see it a bit better the motor should now just pull off the top of the valve but they don't always pull off because what you need to do is just manually operate that valve just to release the motor from the housing so when you do that the motor will lift out because the COG has become disengaged when it goes back in it captures that Culkin or sometimes kept that called going way if you just fiddle that valve leaver across you'll find that you can remove the motor so there we are there's the motor removed and what we've got is a couple of little twizzles on here which it just used to connect those two wires now it doesn't matter which one of those wires you connect that motor to so there's the old burnt-out motor if you like and here is the sync remote so this is what they called a sync on motor but I've got from the plumbers merchants it's very common thing most plumbers merchants will stop these and most plumbers that speaking engineers will keep one on the van and there is the new one we're not worried about polarity we can go either one just to lock it in and then just give them a crimp up probably a little bit fiddly the way I made it look but some things are better than others but I've actually done those in the back of errand cupboards a lot easier and I did that one but it's that easier job to do no rewiring just those two wires to do you don't have to worry about this in some plumbers from reprocessing quad motors they rather replace the whole valve which sometimes means that they got to drain the system down and it can turn the job into a a three hour job so if you know how to do this little job and you can pick up one of these little sink or motors you can save yourself sometimes hundreds of pounds so that's it that's how to wire up a sink or motor on a motorized valve and I hope you found that useful I know a lot of electricians are run a mile from doing a job like that they just never seem to want to get involved in central heating wiring and also a lot of plumbers just leave the wires dangling and look for an electrician it's one of those jobs have kind of falls in between the two camps and it can be difficult trying to find a professional to do it so I'm Roger disappea thanks very much for watching I'll be back soon with more hints and tips and tool tests and all the things that we like to do in skill builder and if you want to keep up to date with this press that subscribe button Oh [Music]

Channel: Skill Builder

Views: 347,851

Keywords: Repair a Motorised Valve, motorised heating valve, motorised valves, motorised valve replacement, central heating motorised valve, repair central heating motorised valve, motorised valve faults, motorised valve stuck, motorised valve manual override, Motorised Valve, motorized valves, motorised valve how it works, motorised valve head, motorised valve wiring, plumbing repair, motorised valve wiring colours, skill builder, roger bisby, fix central heating, diy, how to

Id: KT6mq1440zM

Length: 12min 24sec (744 seconds)

Published: Tue Feb 28 2017