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e1 error on main he boiler?

I Have had a new Boiler (Main HE) fitted and I am getting E1 error on my boiler every morning for the last 5 days I have opened the filling valve just a little and it is fine again until the next morning. The preassure is fine. on 1.5 bar. Could somebody please tell me what th problem could be.

SAJ
February 2013
MainMain HEHeating, Home Heating SystemsBoiler Heating Pressure

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