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Hi all I need some advice, we have a Firebird external combi which lockout after running on water only for 4 minutes, runs fine on heating, thought it might be the water thermistor but having swapped over with the heating thermistor fault is still present, pump runs ok burner fires without fault but still lockout after 4-5 minutes, can anyone help, does the water high temp stat which I presume is on the PCB also fail as lockout ?