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My secondary hot water circulation (i.e. returning the water from the furthest tap to a tapping about a quarter of the way down the cylinder) is quite noisy and I suspect the NRV might be rattling - leads me to wonder why there needs to be an NRV in the return line, before the pump ...

The F13 faults (main PCB connections, according to the manual) started a couple of months ago. All the connections seem OK and cleaning them with switch cleaner has made no difference. Switching off for a while usually clears the fault, occasionally it will clear by itself. Any suggestions...