Difficulty banishing air from Heating system

[matt5791]

Scenario: 4 bedroom detached house with oil fired standard central heating system, well maintained.

Recent events:
- Boiler serviced about 2 weeks ago
- first floor radiators drained to enable repair to rad. valve, 1 week ago.

Since the draining a week ago it seems to be almost impossible to rid the system of air - lots of gurgling and air in the system. Sometimes it has been vented 3 times a day. Many of the radiators go hot and then become colt at the top - both ground and first floor.

There is no evidence of leaks anywhere.

Any ideas or help greatly appreciated!!

 

[leakydave]

Do you have a sealed or open vented system?

 

[matt5791]

Hi - it's a traditional vented system,

Thanks,

Matt

 

[gas4you]

Search FAQs for blocked cold feed as a starting point.

 

[matt5791]

Thanks - I thought about this, as I had it happen on another system.

Will be checking it now.

If anyone has any other potential ideas, be very grateful to hear yuor thoughts.

Matt

 

[gas4you]

Should have said that firstly check your F&E tank is full of water. Could just be ball valve stuck up.