Ferroli fault every Sunday

[Fathedz]

Hey there. We have a Ferroli boiler in our commercial premises. It is set on a schedule for 9-5 Friday and a few hours on Saturday and Sunday mornings.

Every Sunday morning we come into an error code of A01. I know what the code means but what I wanted help with is why does it happen on the same day every week?

 

[EvilDrPorkChop]

Have you tried leaving it on longer over the weekend? A01 is gas valve, and them gas valves don't like it if they get particularly cold. All I can imagine is that with the little/shorter use over the weekend it cuts out as it cools down.

Also have you had it regularly serviced?