Central heating noise?
Question:whats causing the noise from air bubbling up through the immersion tank.i have a sealed system and the radiators have been bled
Answers:
If you have an Immersion tank, you cannot have a sealed system. You must have a balanced flue boiler. I would say that what you can hear is not air bubbles but that your immersion tank is priming.This means that it is discharging boiling water into the feed and expansion tank which feeds you immersion tank. This is most likely caused because the boiler thermostat is faulty or too high a setting, or you central heating pump is set too high and is pumping over the supply tank. Try turning the boiler stat down to halfway, or alter the setting on you pump. If this doesn't cure your problem, then you have to have a plumber to check it out.
A small amount of air trapped somewere. Did you bleed the radiators starting at the top of the house?
Have you got the temperature set too high? It could be boiling ! should be a temp. setting on the side of the immersion heater also check your boiler settings
on your sealed system have you got automatic bleed valves which allow any air in system out but not liquids my system has 3 fitted one on flow and return adjacent to boiler and1 on immersion tank hot water delivery line also check that you have right stat settings on immersion and you are not overheating tank
the answer before is right it cant be a sealed system you may have to fit an aerjec i have fitted one to a heating system recently with the same prob as you it has sorted out the problem
A plumber was trapped inside the works, the noise will stop eventually when he breaths in loads of water, or runs out of food, wait him out, I am one of those who say all plumbers should be drowned at birth.
Don't believe all you read. You can have a hot water cylinder with a sealed system. The people posting some of the answeres are getting confused with a Combi system but even then there are ways. The air in the immersion tank isn't coming from the sealed heating system. The two are not directly connected. If the noise is in the heating then the system will need a cleaner run through it for a couple of days then drained and flushed before re filling and adding an inhibitor such as Fernox. If you are using an immersion heater then this can make quite a bit of noise especially if it is starting to burn through the casing.
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