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Losing pressure on central heating system

S

siplumb

Joined
26 Jan 2010
Messages
1
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Country
United Kingdom
Have got an ongoing problem with central heating system using a Vaillant Eco Max boiler.
The central heating pressure goes from 1.5 bar to zero in around 24 hours but there is no sign of a leak anywhere on the central heating system and the hot water system works very well.
Have tried using Fernox leak sealer but to no avail.
Any suggestions?
 

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