Looking for some non retro related help, Ive been googling for a good couple of hours and can't find what this thing is called... It's connected to the power unit of a continuously running fan system that controls ventilation around the house, continuously runs and boosts when the lights are on in the bathrooms. It runs from a fused power box (fuse checks ok), I think it has died as ventilation to all rooms is no longer running, it has gone wrong before but was soon after moving in so the builder fixed it, assuming its the same thing again. I just need to know what it is so I can search for a replacement.
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