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Fagor?

fagor combi boiler runs for two days sometimes two weeks then cuts out with a red light wich flashes every four -five seconds

John Moncrieff, January 2022
Not sure your type but there are fault codes listed for one Fagor boiler at the end of this manual.

https://morcoproducts.co.uk/resources/FEB20E_Compressed_User_Manual.pdf

Erjdjd, January 2022
link Click here to see other fixes for Fagor.