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Thank you ScottishGasMan and lightning. It was a stuck pump. After getting a few instructions from a plumber I took off the bleed screw and turned the rotor with a flat screwdriver a few times both ways. Then I put the screw back on. Turned on the heating ... again F22 error. Just opened up the...

Thanks for your reply. The pump has not been touched except to bleed air. Strange, however will get it seen to just in case.