Thank you for your reply.
I have checked and the cistern doesn't fill up after the water has been turned off and there is no header tank in the loft space.
Hi there,
We have just purchased a property and we a not currently occupying it. We have noticed that when we leave the house we turn the power off and the mains water supply, but an overflow pipe starts to drip. It appears to come from the toilet or combi boiler area of the house.
We...