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Agreed that's a Y plan with a god dam awful airjec doing cold feed/open vent. Im betting that's full of crap. Cylinder stat should be higher up as well. Boiler stat needs turning down a bit they do get out of calibration.

Changing a number of rads indicates a serious problem somewhere. Get a magnet and check if pipework adjacent to pump and cold feed and open vent . If full of crap magnet will be attracted to pipework. Re quote just looks ott try getting someone who's experienced with your type system to look...

As above snapped spindle replacement valve only cure I'd fit a decent lever valve.

First move is to turn off all rads that are working see if the others come on. If they do system probably needs balancing.

Taping pin gently normal works. After that if your not confident in dealing with it you don't need a degree in plumbing you just need a plumber! We would just freeze pipe adapt it then fit new trv few minutes job but we have the gear.

As above try finding leak. If it's taking 6 weeks to drop pressure I'd be having a good look at all rad valves . Take of heads of trv's and dust caps off lockshields. Auto air valves if you have any can be another source of problems. Just fit a decent system filter, difficult to understand...

We have used many hundreds of polyfit fittings on first fix with zero problems. I certainly wouldn't be bothering to change undisturbed fittings . You can use speedfit fittings on polypipe tube but you must use the polypipe inserts. Most polypipe inserts are now black plastic they work...

That's one of the polypipe versions (polyfit) As above push collet in and pull pipe out.

Terrain was bought out by Polypipe many years ago. They then ran range down and totally discontinued it about 3 to 4 years ago. To be blunt i think your on a hiding to nothing. Maybe email Polypipe and ask if adaptors are available but don't hold your breath!

It's two screws lol

Absolutely take wires out of board replace with link If you do any work on system and have to drain or even just get rid of pressure that's time to remove switch. It's threaded 1/4 bsp so you just need a 1/4 plug.

Grant register installer here. Simple answer link pressure swith out they haven't been fitted to new Grant combi's for several years. We remove them every time we find them mostly because when your working on boiler they are renown for snapping off! From memory the pressure switch connections...

Today first powered flight 1903 Wright brothers at Kitty hawk lasted 12 seconds and covered 120ft.

Maybe a screwdriver slot under all that crud in center?

As above zero problems. We have been working on a large property near Scunthorpe for approaching 10 years. 36 loops in total all commissioned a few at a time. Last 4 due to work near Easter next year!

Never got my head round water saving toilets you have to flush 3 times! Had any number of conversations customers that rotate round ' you mean it won't clear the solids madam?'

Motorised valve micro switch stuck favourite If your competent with mains voltage and have a multimeter check if orange feed from Motorised valve live. Assuming it's wired correctly !.

As above scratched plastic pipe in push fit fitting is a non starter. We always water pressure test any first fix.

Absolutely both eph and Danfoss zone valves have micro switch activated when in manual position. As long as your aware its not a problem. We have used a lot of eph stuff for a number of years. Zone valves are cheaper than honeywell, 5 year as against 12 month warranty Heads just click...

Eph zone valves do make on micro switch when in manual position. Power it up and it it will unlatch . Danfoss valves also make on manual but they stay in manual position when powered up. Absolute pain if you forget to unlatch them.