Air in central heating system

18 Nov 2004
Reaction score
United Kingdom
:?: My central heating system has toomuch air and that causes the boiler to overheat and shut down. This problem was there about 14 years ago when the system (new) was put in. After a while the problem seem to have gone, but please note that the pump was never set above 2 and the boiler temp same or below. The same problem started now when we fitted a new boiler. The system is an " open vented " with 2 motorised valves and a hot water cylinder. I have bled the radiators to get the air out but more seem to be produced. Any ideas anyone?
Sponsored Links
Is the system correctly piped - probably not, if the problem is long-standing. Possibly air is being drawn down the open vent pipe. If this has been going on for a while, chances are that you have severe corrosion in your radiators and a system full of black / brown sludge.
Air is a killer of central heating system, especially when it is getting in contnuously.
Get someone in who knows what they're doing and be prepared for a large bill.
is the pump on the return pipework. This can create air problems.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links