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re-pressurise a potterton promax system 24 he plus ?

pressure has dropped below the operating pressure
and displaying a e19 fault asking to re-pressurise the system but i dont have a manual
stevie, December 2010
could be a silver hose under the boiler, trun on valves on it ( might be one or two) when dial reads 1.5 trun off.
If no hose look under boiler to the right can you see a small pipe with two valves on ? turn both on as above.

erj, December 2010
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