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Baxi boiler operating a standard heating system, ie not combi, was not starting up, with 2 flashing green and solid red warning. New diverter head installed which appeared to sort it out, but now it will not fire even with the diverter valve in the manual position. The valve is a Honeywell 3 port.
Does this mean I should replace the complete valve or does it point to something else?
Any help appreciated
Richard