Replaced Pump - boiler still slapping and banging

[croydoncorgi]

The pressure from the running pump is compressing some air somewhere in the system. Turn the pump off and the water runs back through it and up the cold feed into the F&E tank (or, alternatively, up the open vent and into the tank that way.

A big backflow means a significant amount of air - which is probably the cause of your other problems which seem to be airlock-related.

 

[ChrisR]

At the risk of ponting out the bleedin obvious, if you start the boiler from cold and it bangs and stops, you know where the circulation HAS been happening because the pipes will be hot. Go gropin.

 

[buckmoy]

chris, croydon

thanks very much (again) for your help.

I think I've got enough free advice from the plumbing trade - its time to put something back so I'm getting a bloke in to have a look.

One final question - and I appreciate you guys aren't telepathic.

From the symptoms described, would you reckon a powrflush would help, or even better, solve these problems?

 

[croydoncorgi]

see 'Find an Expert'

Toot, toot. (sound of own trumpet being blown)

 

[buckmoy]

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