We had a problem with an upstairs radiator not heating up so I part drained the system to replace the valve. In the end, I bought the wrong valve (2 x 15mm connections whereas the old one had a 15mm and a 22mm). Anyway, the valve was jammed closed so I freed it up and refitted it.
It's a Gloworm Fuelsaver F (Model 45F) boiler.
I refilled the system. The header tank in the airing cupboard is full and I could hear it filling as the system refilled.
I've been round all the radiators and water comes out straight away when I open the bleed valves.
The boiler is downstairs and I'm pretty sure that the first radiator is the towel rail in the bathroom pretty much immediately above it. That gets hot. Second radiator seems to be the one in the main bedroom - the one that wasn't working. That gets hot. Next is the second bedroom. That gets hot.
This all happens quite quickly.
The pump in the airing cupboard is humming away nicely and I can hear the tone change when I change the speed with the switch.
Eventually, all the other radiators warm up but it probably takes about 4 hours. The downstairs ones seem to be last.
The problem is that the boiler makes an unholy racket. It fires, runs for about 2 minutes then shuts off. At the point that it shuts off, you get an awful lot of banging and clanking for 10 seconds or so then it goes quiet until it fires again 3 or 4 minutes later.
The overrun pipe(?) that goes back up to the header tank is too hot to touch.
So, it seems that the boiler is kettling.
I'm assuming that there is air in the boiler but I don't know where to start to get it out into a radiator so I can bleed it off.
Any idea gratefully received!
It's a Gloworm Fuelsaver F (Model 45F) boiler.
I refilled the system. The header tank in the airing cupboard is full and I could hear it filling as the system refilled.
I've been round all the radiators and water comes out straight away when I open the bleed valves.
The boiler is downstairs and I'm pretty sure that the first radiator is the towel rail in the bathroom pretty much immediately above it. That gets hot. Second radiator seems to be the one in the main bedroom - the one that wasn't working. That gets hot. Next is the second bedroom. That gets hot.
This all happens quite quickly.
The pump in the airing cupboard is humming away nicely and I can hear the tone change when I change the speed with the switch.
Eventually, all the other radiators warm up but it probably takes about 4 hours. The downstairs ones seem to be last.
The problem is that the boiler makes an unholy racket. It fires, runs for about 2 minutes then shuts off. At the point that it shuts off, you get an awful lot of banging and clanking for 10 seconds or so then it goes quiet until it fires again 3 or 4 minutes later.
The overrun pipe(?) that goes back up to the header tank is too hot to touch.
So, it seems that the boiler is kettling.
I'm assuming that there is air in the boiler but I don't know where to start to get it out into a radiator so I can bleed it off.
Any idea gratefully received!
