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Our boiler has started making a very loud whirring noise. Starts about 30 seconds after boiler fires up. After it has been running for a while it gets a bit quieter but you can still hear it. Have recently had fan and air pressure switch changed to sort out other problems. Would this be the fan...

Has anyone else got any ideas?

Ok, thanks.

Hopefully someone can help. Had our boiler serviced and fan changed as faulty in November 2011 and since then we have had a few problems that have got worse over time. May just we coincidence that this has happened since fan being changed - not sure. Each morning and evening timer comes on...