Biasi 24s CH won't turn off

[Andyterry]

Hello all. I've a Biasi 24s. I came home from work the other day to find the ch on. The boiler is in summer mode and the only way to turn it off is by setting the winter/summer switch to zero. I've replaced both dhw thermostats and the main flow switch is ok. Could it be the ignition device?

 

[Dotty]

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