Hello.
I'm having a problem with my central heating that I hope someone can help me with, please. I have checked the wiki and forum and cant find the answer, so please forgive me if i have missed it, but I'm pretty sure I havent.
In summary, I have replaced a radiator with a towel rail, and now my CH system is noisey - sounds like water gushing and bubbling, so I assume I have air in the system. More info:
I have a conventional CH system, with boiler in the kitchen, tank and pump in the airing cupboard and header tank in the loft (plus big cold water tank in loft). Heating is working in that the radiators get hot when they should, and domestic hot water works too, so we have hot water in all hot taps. I have recently removed the radiator from the bathroom and replaced with a towel rail. No problem draining the system down, removing the rad, and installing new towel rail. To test the new rad for leaks I filled the system with just water, then once happy all was dry, I drained out the water, cleaned the small amount of sludge out of the header tank (making sure not to push any into the pipe to the system), and slowly (only opened the isolation valve partially) refiled the header tank. When the header tank was about 1/3 full, I added half a bottle of inhibiter, and continued to slowly fill the header tank with water, before adding the remainder of the inhibiter bottle (bottle says suitable for up to 10 rads, we have 9). With CH & DHW still off, I bled the air out of the rads (and heard header refill). I also let the air out of the vent in the pipe above the pump. I then removed the big screw on the pump, and manually turned the impellor approx 10 times with a screwdriver.
I then turned the thermostat in the lounge up to 30 and turned on the CH and DHW. Lots of gushing and bubbling, but all rads and taps got hot. After a while I rebled the rads until each one squirted water.
However, I still have a gushing and bubbling noise in the system when both the DHW and CH are on, and when only the DHW is on. The noise appears to be most prominant in the area of the boiler and cylinder. I have just rebled the rads but only a very small amount of air had accumulated in the last week or so.
Any ideas if there is something I have neglected? Is there likley to be a vent or somewhere to bleed the boiler itself?
Thanks
I'm having a problem with my central heating that I hope someone can help me with, please. I have checked the wiki and forum and cant find the answer, so please forgive me if i have missed it, but I'm pretty sure I havent.
In summary, I have replaced a radiator with a towel rail, and now my CH system is noisey - sounds like water gushing and bubbling, so I assume I have air in the system. More info:
I have a conventional CH system, with boiler in the kitchen, tank and pump in the airing cupboard and header tank in the loft (plus big cold water tank in loft). Heating is working in that the radiators get hot when they should, and domestic hot water works too, so we have hot water in all hot taps. I have recently removed the radiator from the bathroom and replaced with a towel rail. No problem draining the system down, removing the rad, and installing new towel rail. To test the new rad for leaks I filled the system with just water, then once happy all was dry, I drained out the water, cleaned the small amount of sludge out of the header tank (making sure not to push any into the pipe to the system), and slowly (only opened the isolation valve partially) refiled the header tank. When the header tank was about 1/3 full, I added half a bottle of inhibiter, and continued to slowly fill the header tank with water, before adding the remainder of the inhibiter bottle (bottle says suitable for up to 10 rads, we have 9). With CH & DHW still off, I bled the air out of the rads (and heard header refill). I also let the air out of the vent in the pipe above the pump. I then removed the big screw on the pump, and manually turned the impellor approx 10 times with a screwdriver.
I then turned the thermostat in the lounge up to 30 and turned on the CH and DHW. Lots of gushing and bubbling, but all rads and taps got hot. After a while I rebled the rads until each one squirted water.
However, I still have a gushing and bubbling noise in the system when both the DHW and CH are on, and when only the DHW is on. The noise appears to be most prominant in the area of the boiler and cylinder. I have just rebled the rads but only a very small amount of air had accumulated in the last week or so.
Any ideas if there is something I have neglected? Is there likley to be a vent or somewhere to bleed the boiler itself?
Thanks
