Blocked Plate Heat Exchanger (Sludge) | No Hot Water | How To Unblock | Viessmann Boiler
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- เผยแพร่เมื่อ 9 มี.ค. 2023
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In this video I show how to unblock a plate heat exchanger on a Viessman combi boiler. A sign you will need to do this is when the hot water keeps going from hot to cold but the heating (radiators) work fine.
Over time sludge builds up in the plate and causes the boiler to overheat as the water can not circulate properly due to it being blocked.
Tools used in this video:
Draper Screwdriver Roll/Set: amzn.to/3Xmh6Zz
Bahco Adjustable Spanner: amzn.to/3lupI3c
Do you have to be gas safe registered to undertake that task?
Gas safe to touch the boiler components my friend. Don’t play with gas if you ain’t gas safe.
Gas safe as soon as you open the combustion chamber!
@@dylanbrandley7888
OK, does that mean the water side of the boiler (& the electronics) can be serviced by non gas safe engineers ?
@@assistantto00730 years ago I became a corgi registered gas engineer, 70% of the people on the course were duffer's!
No gas safe needed as you own the boiler it's your property so do what you like to it
That is a top in depth video as usual❤
I will say karma I do enjoy your videos as a new engineer is help me out greatly. The only thing I will say you make it look so easy because you do all your jobs one-handed where I struggle with two lol. Roll on the next video
Haha! New vid coming soon 💪
Great video and yes top marks for one handed work 🏆
Haha thanks!👊
Thanks for this. Subscribed 👍🏾
I watch all Ur videos they are good and top engineer. Can you do one doing right hand blocks and left blocks repairs
What chemical you have used sir? Thank you for sharing
Great vid for anyone wanting to gain confidence in boiler repairs.
Glad you think so Carl 💪
Some of the things you do whilst holding a camera, sick 👍
😎
Great tips
Glad you think so!
Thank you for your time to share with us . Great job 👏
Thank you!!💪
Nice job mate 👍
Thank you!💪
Good video 👍
Thanks for the comment! I really appreciate it 👊
Thanks top video
Thank you for a very informative video. What brand of spirit of salts do you use please? Thank you. Very best wishes Clive
Helpful video! If you find that the air valve on the expansion tank leaks out some water when you go to charge it, is that a problem or a sign of a faulty tank?
great content i use this method as well 👌👊
Great minds think alike 💪
Iv heard you can use brick cleaner.?
Your videos are very good, they are very helpful, especially for new qualified gas engineers like me.
Thank you so much !!!
Smart guy
Good job. Thank you. That was the soultion for me.
Great video mate. I wouldn't be able to film and work with 1 hand so great work :) If the plate hex seals feel and look smooth and not perished, do you just leave originals in when reinstalling plate hex?
Haha! So I always try to change the seals when I can, but if I don’t have any in the van and they seem to be in good condition then I’ll leave them
Hi thanks for video. Do you find this PHE blockage on central heating close loop side or cold to hot fresh water side also. Can this unblocking be done on fire main heatexhanger side. does main HE ever get blocked providing there is an inhibitor in the close loop?
So usually the blockage is on the CH side of the plate. I’ve never seen the HW side blocked up
So yeah, if the system is really dirty then the main heat exchanger can also get blocked
Any chance we can fit a filter somewhere to stop this blocking mine gets blocked every week even we powerwashed it
If there is a pin hole and you say the pressure in the boiler will always be going up, would that be when the heating is on or even without the heating being turned on?
good info , = = = however spirit of salts ( Hydrochloric acid** ) = = = = is too harsh for stainless or alloy ( **Thats why they get pin holed ) . Use a regular kettle descaler instead. and flush both direction with water
I need to do this on my glow worm the part was only £40 so going to give it ago changing it
Spirit of salts will rock the inside of that plate exchanger doesn’t matter how much water you flush through afterwards
Nyc Job
Thank you!👊
Good video mate shame it was a only a 7 minute one
Morning great video , have a problem like yours , the thing with my vessmann is that the boiler is not firing on hot water, there is a full flow out of the hot tap , checked the 3 port vale and it is moving freely, could it be a stat or the heat exchanger thanks
not firing, is nothing like the problem in this video!!
What is spirit salts
Name of liquid to clean the exchanger?
Did you have to use new o rings on the plate heat exchanger
Not sure if he showed whether he cleaned the seals up or replaced them, allways good idea to have replacement seals. & they can fall off !
That HCl is evil stuff! Need to be SO careful.
Would you always replace the 4 o-rings on the manifolds when taking out the plate?
no
what is the price of new plate?
I have the problem, will need to buy a new plate, £160 + labour cost, do you work in London
What spirit salts do you use ?
Usually use the knock out one
Will the plate only go in one way? Cheers
Yes mate
What chemical do you use to clean it?
Spirit of salts
Where do you buy spirit of salts?
Any plumbing shop should have it in stock
👍🧿👏
Is it legal to flush that down the drain???
If it's a soak away drain, that's really not good for the environment, standard drain it's okay, personally I would just fit a new plate and have old plate recycled. Plus it a lot safer, did you hear him cough due to the flumes 😷
If you’re doing the shower hoaky coaky replace it don’t bodge it