1 and 3 are related. this sounds as though your expansion vessel has gone. (does the copper pipe outside show signs of passing water?)
The best way to clean a system is rip it out and repipe it.
The other option is chemical clean, flush and inhibit. :wink:
Blocked return pipe :idea:
Its perfectly fine to turn off your mains stoptap whilst running the heating.
You could if you so wish, turn off mains open taps upstairs and...
"STD" = Standard....... Ben :wink:
Take the rad off and flush it out..
Flow open and close return side.
Looking for around 12' ish differetial across rad.
Off on the control knob and drain down. No need to touch the gas or mains stop tap.
Your system just needs balancing. As seco says, the water will flow through path of least resistance.
You have low pressure in your system.
The white needle in the first dial should be level with the red needle, when heating off and rads cold....
Bit of a challenge Mark. What sort do you like :?:
Joshing with you Diane.
He may or may not be four bags of cement over weight, but he's got the balls to admit it and deal with it.
Thats not nice, cyber bully :shock:
I used to do that job years ago during my twenties and early thirties.
Steel erectors back in them days used to walk the iron. nothing so...
Sorry Ray but I take offence to that and feel I need to comment.
We all know the tuth fairy is a bloke :wink:
Souds like a dry joint on the board.
Repairable if you know how :idea:
Question 1, correct :wink:
Question 2, correct. though you lose brownie points for not fitting it :cry:
First fix diagnosis. give it a whack.
Used to work on the old teles with valves. (remember the good old days) :wink:
:lol: :lol: PMSL..
You walked into that Kev :lol: :wink:
Errrrrrrr 50year owd, and you must be, erm,,,,,, 69.
Now urry up wiv me toffy apple :wink:
Perhaps they haven't had their photos developed yet. :shock:
Separate names with a comma.