GAS BOILER SEQUENCE OF OPERATION PART 1 how a gas boiler works in central heating and hot water mode 

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 👌🏽

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

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

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

Brilliant explanation Derek, thanks 🙏

Thank you i always learn something from your videos 👍✌

Another nice video for new entrants into the gas industry

Excellent video, thank you Derek👍👍👍

Thanks Derek brilliant explanation....

You doing great job thanks a lot

Brilliant as always. Cheers Derek

Great informative video tanx for the upload👍

Great video - very informative. Thanks Derek 😃👍

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

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

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! :)

Very informative video Thanks

Top man, well explained thanks.

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

So just to be sure I understand. Only once the fan starts running, then the air pressure switch, creates a switch so the normally open circuit closes and this proves the fan is running so the boiler can then Carry on and open the gas valve ect?

So so helpful. Thanks BiG D

Very informative, thanks!!

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.

Easly explained nice one

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.

Thanks again

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

Thank you, Nikola Ditsov

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

Derek u legend

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

Love your videos.

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

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 )

First one to watch 😊👍

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

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JD Moran-Campbell

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

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CH👍

Jon-Paul Ward

steve ward

Mike Fahy