Bubbling/rushing noise on startup of CH

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Apr 6, 2010
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Hello all,
I'd appreciate any advice you can give me, my plumber hasn't solved it.
Our boiler and system is 40 years old, gravity fed.
We recently had all the TRVs and lockshields replaced.
When the system fires up in the morning in the morning, for the first half hour there is a lot of 'bubbling'/ 'rushing water' noise in the system, enough to wake me up, which disappears after 25/30 minutes and all is quiet, until the system shuts off when there are a few more seconds of the same.
I have bled the rads a couple of times since the work.
Any ideas?
Thanks,
Jerry
 

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