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namsag. I think I´ll get one and hook it up - although I can´t tell whether the clock is connected to the faulty timer. Thanks for the tip as well to look for a pump failure. If this does not work I guess I will check if the clock is at fault as well and check the 240V. Thank you.

:?: Combi boiler Potterton Midas , Myson BF ( 1993 - ALAH336). Problem, HW works ok, but CH does not. Pilot is lit up but main burner does not light. Observations: - Programmer´s internal battery is gone. I disconnected the prog. - The pilot light ( should be on all the time)...