Flame Rectification 

Brilliant, just tells it how it is no messing around with fancy words. Excellent teacher, and tech

We love ya John Keep the videos coming

Great video. Thank you

Ride bare arsed to London 😂 brilliant vid John

Quality demonstration of service process for electrodes 👏👏👏

Your videos are excellent john. Clearly a very knowledgeable and experienced guy.

Person shooting the video is so far back they are the other room like they are spying lol

I've watched 5 of your videos in a row they're fascinating and technically very good.

Many thanks John. Checking probe continuity really helped to resolve an ignition issue recently.

Great video! Thanks :)

Excellent video john keep them coming.

Excellent.

Great video John

Nice video. I use tile file or cleaning strips and it works a treat. Also 1 one pound coin is 3mm not 2. Very useful video.

The nutty professor

Bang on John keep em comin. Try a multimeter video. (Electrical tests on boilers. I.e. Earth continuity and polarity.) I know u will show us the right way.

Excellent videos John,thank you for doing these and keep them coming please.

HT likes a sharp departure edge⚡️⚡️⚡️⚡️⚡️🔥🔥🔥🔥🔥🔥

Absolutely

Just a brilliant guy like my old lecturer 🤔

Brilliant videos John... Do you do the Ravenheat boiler training ? Coming up to Leeds on 29/9...

Sill add this to my service..I'm subscribed now too

Great effort. Thank you very much for such an informative video. CAN YOU PLEASE MAKE ONE FOR FLUE ANALYSER TEST AND FLUE INTEGRITY TEST please

brilliant - i had used rotary wire brush and sandpaper to clean - useless, take his advice and rag it with a file

Good man I’m thick and I understood you...!

Expert

👍 Like....

cleanfit strips i find work well cleaning probes

£1 coins stuck together isn't 3mm it's over 6mm the best gap is 4 mm in my experience so just over £1 coin size.

I'm guessing John meant to say 2 x 1 penny coins not pound coins ?

audio is very bad.