Hey, any thoughts on what might be causing a really loud buzzing noise, like an angry bee, that kicks in about 2 hours after the central heating has been on? Vaillant EcoTec Pro combi boiler, serviced with no issues found, the plumber who serviced it was stumped.
Here's a sound clip of the noise the bolier is making (delete the gaps, I dont know why it wont let me upload a sound clip or a link):
https: //voca. ro/19c3XFDlJFHQ
I'd really appreciate any help, we are scared to use the heating, as the noise is so loud and seems like it could be a serious issue.
Thank you!
Help with combi bolier making very loud noise when working
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Help with combi bolier making very loud noise when working
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Help with combi bolier making very loud noise when working
Not a Pro but I had a similar noise (different boiler) that made me think my pump was on the way out, it was solved by opening a TRV fully on one of the rads, suggest you open all fully when the noise appears but one at a time to find the culprit.