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aps works fine was tested when pcb went, an water pressure switch was replaced 6 months ago, and has also been tested all ok

lowered it on the gas valve in the boiler, its now at lowest setting recommended in the manual when on high fire

i need help, my boiler broke down a month ago, all fault finding pointed to main pcb, replaced that and now if water is used to run bath or CH is used for a time, i get the 4 flashes per second fault, it seems to overheat but with cover off to test the overheat switch it refuses to go into...