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Heat-recovery unit bricked with PF error (fault temperature sensor)
Remove the four Phillips screws with a Phillips screwdriver.
Open the clamps by unhooking them with pliers or flathead screwdriver.
Unscrew the Phillips screw to remove the temperature sensor.
Unclip the temperature sensor connector from the motherboard.
The temperature sensor had broken because it was corroded by moisture and therefore rusted.
With a soldering iron solder I proceeded to weld the broken part and connect the 2 tracks by applying electric wire and tin.
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