My Jbj auto top up has one of its sensor faulty.
Seems like the lfs dun sell replacement.
Passed by sim lim and chanced upon a float switch, cost $20. Left is new float, right is old, always sense open circuit.
Slight problems
1)The wire for the new float switch is too short so can only be used for sump water level check, and not for fresh water top up tank's pump stop as wire will be submerged in water.
2)Previously I attached a sensor to a magnet just like a tunze pump. But somehow the magnet will affect the new sensor functionality, making it totally not working.