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Mend Saunier Duval Boiler Fan Fires

saunier duval 620f?

I have a 620f boiler the fan stopped working, took it out clean it and replaced it. boiler now fires up but then cuts out any ideas please
many thanks

steve
March 2008
Saunier DuvalD.I.Y, PlumbingBoiler Fan Fires
The vane microswich often sticks or can break.
The boiler will fire up but if detects no airflow, will then shut down.
Move the vane back and forth to ensure it's free moving and test the microswitch operation.

TC
May 2008

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Topic

Saunier Duval 620F Boiler - Fan Issue