what temperature is the boiler set to?
what sort of boiler is it? how old is the system?
is the primary flow from the boiler to the cylinder pumped or gravity?
how far is the boiler from the cylinder?
are any of the radiators getting hot?
The Honeywell L641 does not have a zero degrees setting.
I asked you where the stat was, and you did not tell me.
i will post some pictures soon have sent my double bum to get some batts for camera.
If you turn the knob on the cyl thermostat, it should click as it turns on and off. Turn it slowly and listen. Tell us if and when it clicks. When it is pressed firmly against the metal cylinder (with no insulation in the way) about one third up from the bottom, this click should occur when the temp indicator on the knob is about the same reading as the actual temp of the cylinder, though they can get out of adjustment.
post some pics of the pipes, valves and pump around the boiler and cylinder please
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it's set 3 and half out of 6, i've tried turning it down, it just takes longer but still bubble
it's a baxi and is no oolder than 5 years, the system itself is was installed 20 years ago.
I don't know about the primary flow, how do i find out?
the boiler itself is suituated almost directly below i'd say no more than 10 feet of piping away.
yes the bathroom radiator becomes a little aired but only when the hot water tank becomes full of red hot water. I had a new 3 way motorised valve installed last year as the heating was coming on when i turned the hot water but that no longer happens, it's a honeywell valve.
the 0c i was refering to is when i've twisted the dial anti clockwise all the way to the of position.
the stat is located a third of the way up from the bottom of the tank
it clicks on and off at approx 10C( as there is no indication below about 40)