Videos like this are invaluable for clueless people. This teaches far more than college. Very interesting! Certainly taught me! Thankyou!

Thanks great video! I feel as if I’m a good engineer, but with watching your videos, It’s making me even better 👍🏾

Finally, been dying to see this thanks for this Derek 👌🏽

Another great video Derek, its really great for fault finding, excellent. 👍👍😀😀

This is the best explanation of boiler sequence of operation there is fact

Brilliant explanation Derek, thanks 🙏

Brilliant as always. Cheers Derek

Excellent video, thank you Derek👍👍👍

Another nice video for new entrants into the gas industry

Top man, well explained thanks.

Great video - very informative. Thanks Derek 😃👍

Thank you i always learn something from your videos 👍✌

Great informative video tanx for the upload👍

Very informative, thanks!!

Thanks Derek brilliant explanation....

Excellent video, very informative thanks for sharing 👍👍👍🇬🇧

Hi Derek. I passed my ACS just now and the last thing i did before going in was watch this series, the flue gas analysis videos and the safety control videos. My tutors at options skills have been exceptional (Brian and Mikey) but i have used your teachings throughout training portfolio and ACS so thank you for your time snd effort

Very informative video Thanks

Recently became a service/repair engineer. Really appreciated this video. Company put me on service only as have zero experience get used to the boiler sequence of operation and also the system itself operation. Got 6 months study up for repairs ect so these videos will really help! Do you have one for system sequence! Appreciate yas! :)

Easly explained nice one

Taking my gas next month, you have been recommended. This is gold! Just need to figure out which vids are most useful? Nice one tomkat

Thanks again

Thanks for the vid Derek 😁 just watched Aaron trainee 👌👍

Derek u legend

So so helpful. Thanks BiG D

Thank you, Nikola Ditsov

This short video is amazing! Gives me a much better understanding on the sequence of operation. Will definitely watch this one again at some point. Glad you have done this video (I love all your videos). You said the air pressure switch is to check if the fan is running. Is this the only purpose for it? Much appreciated Derek 👍🏻 Asian Jon. Training.

Love your videos.

Thanks for video Any chance for a video about gas fires: insert, DFe and how to differentiate between when on job. Alot of videos about ventilation but not many clear about how to easily and clearly tell which cat this or that gas fire fall under . Would appreciate that alot

First one to watch 😊👍

Thank you,sir; I have a question, please: Roca Victoria 20/20, if the flow sensor,the Hall +magnet sensor, it is only in the domestic hot water,circuit, faucets,if it is bad (or disconnected?) the CH,central heating, will still work perfectly, won't it? thanks; and again, a masters explanation was provided there.

Can you please do a video on setting Burner pressure on Turbomax, love your videos, really keep the standards up.

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Good video. Bread & butter stuff but still ....I liked the content etc

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What does fan do? And for sequence of operations why pump come on seconds After room tsta

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JD Moran-Campbell

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I don't understand why it needs pomp proving switch in hot water mode. It had first the flow switch that is proving the presence of water in system and also means it's enough pressure (by spinning speed )

Can you do the same video but for high efficiency boilers with premix burners. Part 1 and 2

CH👍

Jon-Paul Ward

Something else I have learned when I get no hot water on my vaillant boiler it's usually the water sensor not working f75

steve ward

Mike Fahy