Hot water failure? How to replace the diaphragm on a Potterton combination boiler
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- Опубликовано: 10 сен 2024
- The central heating is working fine but there is no hot water. This combination boiler is installed to supply hot water and heating to the house. The heating is working fine but there is no hot water.
In this video we show you how to replace the hot water diaphragm in the diverter valve.
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I must say many many thanks for your video WITH SOUND - I was quoted lowest price £235.00 to replace boiler no one was prepared to repair it - Job now done - Cost under £25.00 thanks again - Bob Law
£235 to replace a boiler you wish lol
I guess the commenter meant £235 for the job in the video, not replacing the boiler.
Funny thing that in many cases it'd be OK price for many - it's just the market of boiler specialists (at least in London) is bit crazy. There's way to many inexperienced, borderline scammy repairmen. Then there's category who insist on completely replacing the boiler instead of repairing a perfectly serviceable one. Which is a shame.
Thank you John for such a clear video. Gave me confidence in my diagnosis and what would be involved. Happy partner, and economical home repair when there's no money coming in. Best wishes to you and your followers.
Tom, Cumbria.
Hi John! Managed to pick up just the necessary parts as a kit from Amazon for £3.80. This will save me gallons of water and, consequently, money! Many thanks for this very informative video - it took me about 20 minutes to replace the diaphragm.
Great video for those wanting to do it themselves, especially when you can't get a plumber anywhere in the world at the moment.
Very usefull instructional video. Have just used it to do this job and would add the following; The kit has a very small o-ring that slides on the shaft before fitting that plug but so it sits in the end of the plug; note the spring is very strong so be careful not to damage the sensor pipe when removing and replacing that end cover. I wrapped insulation tape around the pliers to avoid damaging the metal spigot as had to grip very tightly. Also, I used the grease supplied to slightly smear the two metal spigots. Note that my hot water isolation valve was stuck so could not turn it off but very little water came out anyway.
Hi Brain, could you explain where the o-ring goes exactly please? thanks a lot
@@FriendlyFireBrigade Where the shaft that operates the microswitch projects through the outside of the assembly, the o ring is placed in the hole before screwing in the plug. My previous comment more or less states this but hopefully this clarifies it. I am aware that some instructions omit to mention this o ring.
@@brianclarke4145 thanks Brian, especially for you initial comment! After the replacement nut/plug arrived with the O-ring stuck to it with silicone grease, I figured it out by myself. Whoever replaced the last plug/diaphragm in my boiler did not fit the O-ring at all. That's why it was leaking and with limescale bild-up around the plug until it did not move properly anymore. I think the biggest problem is this o-ring is not mentioned in the boiler documents / exploded diagram
Excellent video - Cost £13 for a new diaphragm and nut where push rod comes out - problem was a tiny hole in the diaphragm, so don't expect to see big rip everytime. Save me a fortune - thanks m8
Excellent you have helped me to see what is wrong with my boiler, the pin is not moving so I will probably need to change the diaphragm. Thanks
Fantastic video. Very instructual step by step guide for DIY repair. No longer have a leak and the girlfriend is finally off my case to repair it. Now I can enjoy my sunday. Cheers
Thank you John Wallage❗️ It worked a treat and we've made my godfather very happy on his birthday🚿
Cheers John, really helped me out this video. Only cost me a tenner and 20 minutes of my time. Thank you! Pat
Excellent! Thanks for this.
Fantastic video, saved me a small fortune.
Thanks!
Very well explained and not too long...excellent 10/10
rj s thank you
Great instructional video, Thanks
This is exactly what I needed. Thank you
You’re very welcome 😊
Brilliant video, has saved us so much money! Thank you
you're very welcome, glad to help
Brilliant video a very rewarding job loved it, thanks mate
Great video, but these instructions are incomplete. How do you apply silicone grease on the push-pin? Where does the tiny o-ring go on the pin?
Lovely music
Thanks Mate. Fixed! Great video :-)
Very good video and very helpful indeed! Thank you.
Jayes SS you are very welcome 😀
Thanks for the video! Helped a lot
Apart from the cheesy music...One of the best videos I have seen....Well done on the video...G
Is this the same on the
main 30 eco
why would you turn the central heating flow valve off ????
these a small rubber washer comes with the kit wheres it go
Yeah I know it's a little late but for future reference it goes on the plate which was still attached. You can see the front push rod. This is a new seal for the rear push rod. When the knackered rubber diaphragm is removed. It basically goes into the whole you can see in the centre. Sorry if I sound a little confusing. I hope this helps.
I know the boiler documents don't mention the o ring or show it on any diagrams. Pretty poor show really. The instructional videos on youtube by others are much more helpful. Thats how I found out about it.
Twice! After a leak Dec 2017, I replaced the Diaphragm and now it's gone again but with loss of hot water this time but no leak. What is it with the design? However, looking at the records the Boiler Main HE24 appears to be installed 2004 so the original lasted around eleven years? Can someone please explain?
Hi,
I have the same problem on a baxi 105e, the original lasted approx 10 years or so, and now I have to probably replace the diagphram approx every 12 months, due to lack of hot water, I just put it down to the replacement parts of today being inferior quality..
Did you have to use any silicone?
Hello mate I have this exact boiler and I’m no longer getting hot water or heating there is no flashing warnings lights however I can tell it’s not igniting. The pump is fine and diaphragm and pins all move and all seems to be working do you have any other suggestions
Cheers pal
Is the boiler come on when you turn your hot tap on?
do you need to turn off the mains because when I isolate the the boiler water feed and drain the boiler I cannot undo the pipes going into the diaphram casing without water under pressure coming out. ?
Isolate cold coming into boiler. Then open a hot tap. You’ll still het a bit of water
Great video. Thanks
thank you, very helpful video, saved me £1500, every plumber I spoke to only wanted to sell me a new boiler, they weren't interested in repairing it! cost me £11.50 for repair kit. (just one thing, its obvious I guess, but u dont mention to turn off water at stopcock, of course only an idiot wouldn't do that, ahem lol)
I'm glad we could help
Turn off the cold water inlet to the boiler. Then turn on the lowest dhw tap, then back off again. The boiler doesn't need to be drained down to change the dhw diaphragm. Only if you're going ahead and changing the central heating membrane too. Neither flow & return need to be isolated either. Again only if the smaller rubber is to be changed.
@tearsdontfall14 Not at all. I suggest having a little plumber/silicone grease though. If you look on ebay or Amazon. Some of the sellers will send a tiny pack with it.
Just close the blue inlet pipe under the boiler and run the lowest hot water point in the house. You'll need a small adjustable wrench or 10mm spanner to undo the top nut. Then a flat head to undo the 6 screws for the rubber diaphragm.
I highly recommend you isolate the power to the boiler 1st. Also if you can wrap the drop down control board with black bin liners. YOU DO NOT WANT TO GET ANY WATER ON THE PCB.
@tearsdontfall14 Sorry if it's the central heating side which is the small one to the rear isolate all the supply taps under the boiler. Except the central one (Gas). Then drain to the rear right behind the pump. If you remove the front hot water chamber on the diverter valve ( there will be 2 grub screws, you'll need a stubby screwdriver. You can change the central heating diaphragm without removing the whole Diverter.
@tearsdontfall14 Remove the from dhw chamber 1st. Make sure boiler is isolated at electric and below all taps are closed. Drain point is behind the pump small section of hose and a bucket. Long flat should help you open it and drain.
If you haven't got the service user manual download it.
Good luck
ghostmanromeo uk:
Can I ask if changing the diaphragm (of the front valve) as shown in this video can sort out the leak problem as well?
Got water dripping from the middle/connecting part between the front valve and the rear valve. Not sure if the whole valve unit needs to be replaced, or changing only the DHW diaphragm will do the trick?
Hope you can give some hints, thanks a lot!
@@General18988 Google this item number 232231244804 it comes with the gland nut (replace this & washer provided too). As it's a moving part it wears down over time. Firstly drain the boiler as above.
Clean the internal area and lightly smear the outer rubber diaphragm with the silicone grease provided. Make sure you have the item number provided at minimum. You can purchase a rebuild kit for the diverter valve to. But that means you have to remove the whole part.
Can I ask if this can sort out the leak problem as well? Got water dripping from the middle/connecting part between the front (hot water) valve and the rear (central heating) one. Not sure if the whole valve unit needs to be replaced, or changing only the DHW diaphragm will do the trick?
Hope you can give some hints, thanks a lot!
Did u find an answer? I have the same problem
I did the replacement it was quite easy but now there is a leak at the back of the diverter valve has anyone experienced this?
My bath water isn't getting that hot, discovered that some of the heat/water is going to the rads even when the CH is off,...my diverter valve must be stuck, just ordered that repair kit but is the diaphragm in the front part always the problem? What about the other section that that's connected to, all the other parts of the repair kit/smaller diaphragm go in that??
I have the same issue, did you manage to get your problem resolved ? If so, how ? Thanks
Good and clear explanation. My Baxi 105e is heating the radiators as well as the hot water. I'll check the diaphragm and ensure that the pin is moving correctly first. Otherwise I suspect that another part of the diverter valve is stuck open. Luckily I have TRV's on most radiators. Is it tricky to remove the whole diverter valve ? Have you previously attempted it ?
David Larkinson it’s easier and cheaper to replace the diaphragm than the whole valve
@@JohnWallage Indeed... as long as the issue isn't somewhere else in the valve. I get heat and water when only the water is selected. However I will check the diaphragm over first. Thanks
I will try this!
Brilliant video
Gary Ashton thank you
@@JohnWallage just ordered the kit for 2.49 🤣🤣🤣 im so happy the gas lad never had any on the van today. 70 quid saved
I might do my tickets. They must be loaded
Why did you turn off the heating return valve 0.59?
Strange, he only really needed to isolate the cold inlet to the boiler. I don't even do a drain down for a dhw diaphragm. Very quick job. You don't need to dissipate any pressure other then then the lowest hot water tap.
very helpful... you dont have a video of how to do the dhw filters on a maine30he :)
Correct spelling is Potterton, may be worth editing the video title and adding the model number of the boiler to make it easier for potential viewers to find. Cheers
Thanks :)
I have a leak. Will this solve the issue too?
AmZ: Hello mate, can I ask if you sorted out the leaking problem by changing the diaphragm only?
Got similar problem here, dripping from the middle/connecting part between the front hot water valve and the rear central heating one. Not sure if the whole valve unit needs to be replaced?
Please share some hints, Cheers.
dont work as easy as that all the screws are to tight to remove
great info..dont like the cheesy lift jazz music
Great video thanks!