My central heating system and combi boiler seem to run fine until I draw hot water (if the heating is on). A few seconds later a slow rumble starts in the boiler and builds to a high pitched whine which only stops when either the heating is turned off or I draw more hot water.
Having read some earlier posts on here, I've turned the pump speed down from 3 to 1. This has lessened the noise, but it's still there.
The heating is via 6 radiators, 4 have TRVs, the other 2 have basic flow taps. I've tried every combination of having these valves open/closed but it seems to have no effect on the noise.
Any suggestion please on what this could be and how I fix it?
Having read some earlier posts on here, I've turned the pump speed down from 3 to 1. This has lessened the noise, but it's still there.
The heating is via 6 radiators, 4 have TRVs, the other 2 have basic flow taps. I've tried every combination of having these valves open/closed but it seems to have no effect on the noise.
Any suggestion please on what this could be and how I fix it?
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