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Thanks for your reply. Do you have details on the steps we need to follow ? - We have just been testing logically. We did let the pressure on the boiler go down to zero (via a radiator valve). Thanks Daniel

We have a Heatline Vizo 24 condensing combination boiler which is about 3 years old. For the last few weeks the pressure has been dropping slowly (when not being used) from an initial pressure of 1.5 bars, to around 0.8 bars - resulting in the boiler not coming on. When it is on, the...