Boiler (Combi) pressure loss

Joined
7 Jul 2010
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Location
Bristol
Country
United Kingdom
Hello. I have an Potterton Puma combi boiler about 10yr old. Just recently
without running the CH it is losing pressure, 0.1 bar every few days.
Expansion tank pressure was low - pumped up tank but still same pressure loss. Does this mean I have a leak in the CH system ? Can't see any leaks from rad valves. Can't access all plumbing under the floor
very easily. Thanks
 
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