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Yip, I think the fan is a separate issue too. There was also an error code showing the was a fault "water pressure switch not operated" but this seems to have been overtaken now with the fan alert. The loss of pressure: is that likely to be connected to a fault in the expansion vessel? Or...

Hi I have a Potterton Gold 24he combi that keeps losing pressure, needing refilled every 24 hrs. Error code points to an issue with the fan, but i think there has to be another fault to account for the lost pressure? When the flow and return pipes are switched off at the boiler, and left...