By far the best tear down video you will find out there. Great work Derek 👍

Another excellent video. Wish I would of had you as my instructor, my training place was horrendous. Thankfully I have come across your videos along with some others and I am doing my portfolio with a top engineer so things are starting to come together. Great work, thanks mate!

I am a Vaillant Engineer and this is a very good detailed video, brilliant

Wow...what a thorough and plane explanation of vaillant boiler strip...amazing.

Splendid video Mr Robins you are a Luminary in the boiler fraternity , shame about the rotten mob , CTID.

Exactly what i needed to know. I like all your videos. Detailed yet not boring

Another cracking review. The amount of detail given is amazing. Not only that! It’s well explained. You definitely know your stuff. So lucky to have access to these videos 😊. Thanks Derek. Asian Jon. Training.

Thanks Derek for an awesome video, it helped me change the pressure sensor after I got the infamous F75 fault and I saved a small fortune, your concise description made the job easy peasy, cheers fella.

The most informative video about Vailant boilers maintenance and repairs and functions of the main components of the whole heating sstem

I have valliant training next month, but your videos have been very helpful me. Really appreciate. One of the best video on KZfaq

Very good informative tutorial video, Excellent insight how a combination boiler works, Thank You Derek, ManyThanks.

Another great video by mr derek very informative and easy explained thanks again sir

Amazing video as always Derek!!

I have just bought this boiler to replace an incontinent Worcester/Bosch 24i Junior Greenstar which has always needed a bucket under it! Worcester used to make a 350 which was an un-burstable, superb boiler but their boilers nowadays are shite in my experience. Great video and great help because I'm a joiner not a plumber!

Fantastic video many guys won’t let you know all this info

You are a gem mate. Keep it up .what a great strip down and explanation 👌

Keep doing good job Derek.

Very informative video, great tips. Thanks Derek👍👍👍

I like the way you explained unlike other cowboys

Like your videos,clear concise and informative 👌

Thanks Derek great video it help me out no end

Another great video, thanks Derek

Thank you very much for your hard work making this Video, I enjoy so much,,,, 👍❤️

best video explaining how it works , ,would love you to service my boiler, as u know your onions

Fantastic video, thanks so much 👍

Excellent video....keep up the good work!

Bloody fantastic video. Please post other similar vids for other boilers

The best video very useful and clear explanation

Nice one, thanks a lot for all the info, brilliant. You and yours keep safe. Singem.

Excellent video , saved me a fortune

Great video mate. Very informative. Thanks

great explanation Derek

That was fab Derek❤

Excellent video perfect explained every things you beauti Derek👍 😍

Excellent video yet again I'm currently doing my portfolio in gas safe every time I watch these videos I learn so much No one else puts as much detail and clear instruction on this industry. Could you do a video on multimeter testing of boiler components Thanks again 💯

great video, very informative. Thanks

A1 one video tutorial keep it up mate excellent content

Good morning this is great video

Brilliant explanation 👍

Really a very interesting video. TOP MAN

nice video. I've learned something. Many Thanks

Excellent video.

You did alright bro don't see many channels break into and remove parts with a detailed explanation I wanted to laugh when I saw your lidyl drill I almost went to turn you off until I saw the lcd display pressure to fill the vessel Not bad mate 👍

Excellent vid, very educational, i need to replace my heat exchanger return pipe as it is split, before your video the pipe was a whatsit thingy. now i can order one from ebay. cheers all the best.

Excellent really enjoyed that thank you!!

Excellent video very educational.

Excellent video

Thank YOU DEREK

Thank You, excellent video.

Gracias por el vídeo me a sido de gran ayuda un saludo desde 🇪🇦

Great video 👍

Great video 👍🏼

Thanks for the great video

True about the HT lead cap breaking, I normally just unbolt the electrode from the burner without removing the cap, a new electrode gasket is supplied with the graphite seal

I have just retired and enjoy watching your videos.

really enjoyed demo very good

Dankeschön für das tolle Video!

Very helpful, thank you!

❤ ThanQ 4 yor Hi-li educational video 😮i am a Auto-Engineer & foud it word 4 word interesting 😮 ThanQ Ever-so much 😅

Really good information

Great Video

excellent and informative

6 years ago, I decided to change my Boiler, from our good old reliable free-standing Worcester, to one of these popular ''COMBI' boiler's. Buy a Vaillant they all said, The German Rolls Royce of Boiler's. After the guarantee ended, weve had to call out the 'repairman' 5 times, despite the servicing. Constant l;oss of compression, failed 'scensor '? a tiny bit of plastic. I jokingly asked the repaiir guy, how much is that, a fiver ? '' Add a naught '' he said. Then the Pump was ''Suspiciously slow'', and, 'Probably Sticking.'' ''It could fail, but when ??? nobody can tell.'' After I checked every Rad and joint accessable for leaks, it still cuts out ( first thing in the morning -it's favourite time for a rest) = no pressure again. VAILLANT--? NEVER AGAIN.

Fantastic great I e a gas engineer good to see like it

another outstanding vid with some really handy tips, thanks for just getting on with it, brill.

Boiler is fixed. The leak was the diverter valve cartridge in the boiler! got a new diverter valve.

Very nice 👍🏼

great info, thanks

Thanks for sharing.

Thank you Very much!

excellent

on the gas valve, inlet pressure around 20mbar for G20 and 0mbar on the outlet because it's a zero pressure regulator inside (possibly between -1 and +1mar because of small error but never more)

Thomas Bradwell Thanks Derek

Thanks for this video don't see many like this at all so keep them coming I have a question though I have to do a service on the ecotec 813 for my gassafe probation do I need to drain the water at all as all that's needed is gas work I believe thanks

Great 👍🏼

Very interesting

Thanks

great video, only watched it as I got a boiler problem on a 2-year-old system. Heating on = everything fine but when the heating goes off pressure drops and boiler useless until you repressurise it. No visible leaks anywhere on the entire ch system, any ideas?

Great video. What about the heat exchanger though?

Great detailed breakdown of this boiler. Would you happen to have done one for a Baxi 105 instant. If so a link would be appreciated

better than our collage

top vid

Great vid! Thank you. I wish you showed full pump removal though. I looking into courses to do this summer and just self-learning right now. To remove the whole pump assembly do I have this correct? 1.Switch off boiler. 2. Drain boiler. 3. Turn off inlet and outlet valves clockwise leading to pump. 4. Unplug connection and remove pump head (for easier access) 5. Remove diverter valve as explained in this video. Remove pressure sensor as explained in this video. 6. Unscrew copper pipe to pump (right side). 7 Unscrew connection to expansion vessel. 8. Remove pump screws. 9. Replace gaskets and refit . Do i have that correct? Cheers!

Derek - another great video - very informative. I was shocked about the catalogue of faults that are "common" on these boilers. As a professional engineer, but not in the boiler business, this indicates to me poor quality design and development by the boiler manufacturers with the public left to pick up the bill for this. Are all manufacturers this poor or are there some with a much better reliability record in your experience? Also if putting new boilers on old dirty systems is problematic, what method of system cleaning would you advocate?

I didn't know I'd get the history channel.

Good!

Hi derek great video as always 👍🏼 what is the problem generally if heating working fine but hot water not,Led display shows reaching 65degs but water like warm, not diverter valve, likely a sensor or something else, can anyone assist or advise? Cheers

Hi brilliant video....I have a valliant boiler which has zero pressure on the PIN dial,but will still give me hot water and heating, but I have noticed the radiators become hot quickly...could you have a suggestion on the fault please thank you.

Another brilliant vid.. got my first Vaillant boiler service next week on that very model.. so just getting the low down.. 1 thing though.. there was a drain off on both flow and return.. is it either/or to drain boiler or use both?

I would bet there are companies who have used this to train their engineers, they should give you some money if they do!

good review of the boiler - Q. if i keep getting F75 (changed sensor, PCB, wire harness) is it time to remove and get another unit or a new pump? I can get the boiler working with three off-on operations in the morning, it then shuts down at 12:00 am but can't get going from a cold start at 07:00 am until i do three on-off switches

Great video Derek. This model is the same as mine. Is it compatible with the Hive smart thermostat? As I can't see where the Transmitter would go. Thanks in advance.

Thanks for your video. I have replaced one fuse under the rectangle black box in the right bottom on the CPB. After changing it, my boilor is working fine but. only yellow light on for heating. Green and yellow light on for hot water. I am just wondering it is normal. My boiler has two spare fuses on the CPB cover. Do I need to replace one more fuse? If so, I can't find the second one on the CPB. Does anyone know where it is? Thanks

How come you say should have co2 reading between 8.2-10.2 but in the manufactures instructions its saying 9.0 + or - 1 just confused me. Great video again please keep them coming !!

Thenks you Türkiye im Ersin vaillant

i have the same boiler but not with the rubber hoses or the brass diverter vale my one is black plastic its been in for 6 years now no problems what i would like to know what should i get done now regarding full service and what parts should i replace to keep the boiler tip top also i dont think the expansion vessel has every been done or check

Hi Derek, my Vailant comes on & off at night making the same sounds when the heat is coming on. Sounds like it's re-calibrating or re-adjusting. Any ideas what that could be please or do I need a plumber or service? Thank you.

Hivery good

Hi, my boiler is vaillant vuw 260 . The problem is that if the chimney led flashing more than 90 seconds after it doesn't start, just running the pump forever. Any idea why? Thank you!

Derek, can you explain/show me how the boiler uses the flue gasses to “reheat” the water to make this a condensing boiler please? How some of the heat is taken from the flue gasses to reuse to heat the water....