the thermo coupler has been replaced in my thorn apollo 30/50 B boiler however it stays on for so long them it blows itself out, can anyone give me diagram of boiler so i can check it?

sarah, December 2009

You could only check if it was put together if you removed the front casing (decorative) and then the main combustion chamber cover.
This combustion chamber cover should only be removed by a gas safe registered engineer.
Call someone with a knowledge of these boilers.
The thermocouple along with the overheat stat are gas safety devices and should only be touched by a gas safe registered engineer.

Anygasman, December 2009

sounds more like o/heat stat problem to me if it allows the boiler to fire up properly then all extinguished. faulty t/couple wouldnt allow pilot to stay on never mind burner.

ste, December 2009