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Worcester bosch Highflow 400 rsf?

The fan fails to start causing lock out but a push will do it whence it works for a variable time (days weeks months). This is the 4th fan in 5 years it seems to last a year or so before doing this. Does anyone know the answer?
(not)TC, February 2020
https://www.youtube.com/watch?v=9G6BIUUVq_c

ereyrreyery, February 2020
link Click here to see other fixes for Worcester.