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My heating and hot water do not work and “A03” is flashing?

Hello, I have recently come across a problem with my Chaffoteaux & Mary, where neither my boiler nor heating work. It was working perfectly fine the night before but then shut down all of a sudden, and it flashes “A03”. Unfortunately I do not know which model it is, please help.

James
April 2022
ChaffoteauxHeating, Home Heating SystemsHeating Hot Water Boiler
https://www.manualslib.com/manual/946072/Chaffoteaux-And-Maury-Minima-He-System-24-Nat.html?page=56

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April 2022

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