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I have an unvented heating system that was installed just under 3 months ago.
In the last few weeks the HW cylinder makes a very loud humming/vibrating noise when the HW pump for the secondary feed is on, but makes no noise if the CH is on at the same time.
The noise fades in and out and sounds like an aircraft is overhead
Any ideas what may be causing this please as it’s driving me mad
Many thanks
In the last few weeks the HW cylinder makes a very loud humming/vibrating noise when the HW pump for the secondary feed is on, but makes no noise if the CH is on at the same time.
The noise fades in and out and sounds like an aircraft is overhead
Any ideas what may be causing this please as it’s driving me mad
Many thanks