DIY Doctor

Automatic venting of air lock in central heating system

Postby ThePlumpPlumber » Mon Nov 02, 2020 5:56 pm

Our central heating has a bit of a design “feature”, namely that the boiler often throws up a terminal error because of an airlock. Basically, there’s about a 7 meter length of horizontal piping before the boiler goes off to the radiators. Any fresh water added to the system has some air dissolved it in which comes out of solution when heated and this gets trapped in this piping. From there the boiler fires up for a few seconds, turns off because it sees its overheating and after a couple more tried throws a red LED error.

The solution is to bleed it at the pump but this isn’t always successful .

Is there any way to automatically vent the pipe or a way to configure the system so the air lock can be easily cleared. Once the air lock is cleared the system works fine for months.
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Postby stoneyboy » Tue Nov 03, 2020 10:35 pm

Hi theplumpplumber
Suggest you fit either an automatic of manual bleed valve in the length of horizontal pipe, if this is where you get the airlock.
Regards S
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