Why do the solenoids in the water production unit often burn out the main board?
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A common reason for the motherboard being damaged in water production units is that the electric component of the solenoid valve shares the same shaft as the valve body itself; leakage at the shaft seal leads to damage to the circuit board. Could anyone recommend a good brand of solenoid valves?
If possible, switch to a pneumatic valve! (A large number of pneumatic on-off valves were once used in the desalination plant; the problem was that these valves tended to leak internally due to corrosion, so a rubber-lined diaphragm valve had to be installed in front of them.) If waterproofing is the only concern, one can consider having an electrician use waterproof tape for sealing, then wrap everything in multiple layers of plastic bags, placing desiccants between the layers, and replacing them regularly.
Solenoids are the best from ASCO.