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ARISTON MICRO COMBI BOILER 23/27 MFFI Running 6 radiators from it NOT overly big - first rad gets hot - second rad luke warm - then boiler shuts down - then refires but not heating 3 upstairs rads - all rads bled - BUT only Luke warm heating. Anyone know how to resolve this problem please...

Please help, having had a ARISTON MICRO COMBI Boiler (microCombi 23/27 MFFI) installed a while ago now, I am experiencing problems. The RED warning light ignites whenever the hot taps are operated frequently meaning having to constantly reset the button until the gas ignites and hot water flows...