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My Potterton Gold combi HE is showing E19?

How do you top up to 1.1.5. I've turned the taps underneath the boiler but no difference.

Any help?
Mary, August 2010
Mine did that...open the display box and turn to reset for 3 seconds...

peechieness, August 2010
link Click here to see other fixes for Potterton Gold combi HE.