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You could always un-cap both ends & put a tub/bucket under the bottom tapping of the coil, if it fills with water you have a leaky coil.They usually go with a pin hole forming in the coil & the give away signs are that the central heating header tank starts over flowing as the bigger domestic hot water header tank is usually higher & the water is trying to find its own level.HTH.Cheers.Edit, depending on how you`ve capped the ends you could be getting a pressure drop as some plumbing fittings aren`t air tight
You could always un-cap both ends & put a tub/bucket under the bottom tapping of the coil, if it fills with water you have a leaky coil.
They usually go with a pin hole forming in the coil & the give away signs are that the central heating header tank starts over flowing as the bigger domestic hot water header tank is usually higher & the water is trying to find its own level.
HTH.
Cheers.
Edit, depending on how you`ve capped the ends you could be getting a pressure drop as some plumbing fittings aren`t air tight
