Main Combi HE - How To Change The Diverter Diaphragm | No Hot Water??

REASONS YOU WOULD NEED TO CHANGE THE RUBBER DIAPHRAGM:
- The rubber diaphragm has split. When you open the hot tap and call for hot water, the water flows through the diverter, pushes against the diaphragm, pushes the pin out of the front nut and then activates the hot water microswitch. However, if the rubber diaphragm has split, then the water will not have the same effect when pushing against it, meaning the hot water microswitch doesn't get activated, ultimately leaving the consumer with no hot water.
- There is water leaking around the pressure differential valve.

[@paulowens5034]

I had a little leak.Bought a diaphragm repair kit for £12 on eBay, followed your vid and leak is no more.Thanks pal.

[@Akoito0918]

Thanks for sharing this video. It helps me a lot and saves money as well.

[@jamesfin6039]

Well done mate .. nicely done

[@rogergray7140]

Thanks very very much for this video! Sorted it with no problem. Hot water back again!

[@colin5064]

Good video well explained, my only suggestion would be to point out the water scale build up under the rubber diaphragm may require cleaning off in some cases.

[@antonywilliams5703]

One additional step I'd recommend is to open a hot tap to relieve the water pressure before undoing the screws, ideally at a point lower than the boiler.

[@tl50camiva]

Excellent job, thanks for the upload.

[@ian7579]

Really informative video, I checked my diaphragm and it looks ok but 6 out of my 7 hot taps start the boiler the other one doesn’t push the pin out far enough to close the microswitch , also 2 out of 3 of my showers are the same, any ideas?

[@kbrascco]

Doesn’t the boiler need draining down to change the diaphragm.?

[@martinholroyd812]

My diverted valve leaking from pin,what could be causing this,don’t fancy getting brand new valve if I can get new seals for it

[@paulmac1532]

Thanks mate great help.

[@Mrstuff1000]

Will this fix a leak from the pin on the front nut that comes out to activate the switch?

[@drywipe1989]

Iv got water coming out a little hole behind where it joins the diverter valve, will this solve that?

[@emomoney8805]

Gr8 vid

[@IvanCelant]

Excellent video, do i need silicon gel?

[@advancedboilertraining]

Yeah I would always recommend using lubricant

[@kopynd1]

is this the problem when you have to have your heating on before you can get hot from the tap

[@MrHarrySpeakup]

Thats what I've experienced, and if you don't swap this part, then it can lead to water dripping from the front of the diaphram casing. I have replaced this part every couple of years... (I've always worked from home, so the boiler is in heavy use!)

[@paulharrison872]

Super video cheers

[@timhancock6626]

It's very similar on the old Glow Worm Compacts ( not the current one. These were from the late 1990s) Hot water diaphragms lasted about two years so we carried a handful in van stock.