Worcester bosch cdi humming intermittently

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Hi, got a 10yrs old WB greenstar 37cdi. Runs nicely but every few minutes has a loud buzz that fades in then back out, lasts for a few seconds or minutes
and then fades out. Definitely not the pipe work or snagging. Can happen any time, not just upon fire up or shutting down. Any ideas? Thanks
 
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Hot water preheat? Put on to Eco & see if it still does it. Good boiler.
 
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Hi good shout, unfortunately the boiler is always in Eco mode as We have an old fault where the pump spins constantly (24/7) if Eco is off. Non of our engineers have ever understood it so they just advise to keep Eco on. I think I need a new pump. Any advice on pump noise anybody?
 
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