De Dietrich GTUC 120 boiler burner failure

[bebert1710]

Hello,

I have a problem with my GTUC 120 DE DIETRICH boiler (fuel oil condensing boiler) equipped with an M 120 N burner.
It seems that the problem comes from the burner safety box.
But before buying a new one and changing it, I would like to be sure that it is this part that is broken.
How can we check the condition of this part (electrical measurements) and how can we test all the parts of the burner?

Thanking you in advance for your help.

[phil59]

Probe to be cleaned (the one that “sees the flame”).

In addition to the filter at the fuel oil inlet, there is a filter in a pipe - burner, which we do not think about.

At first, it stops for 5-10s, then it starts again, etc....