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The chances of both your original solenoid failing, and a new one being defective, are very low indeed. The fact that the 10A fuse blows when the system is activated indicates that there is most likely a dead short in the circuit [as mentioned by JA]. Check all of the visible cable and connections for signs of damage. There is one other possibility. I assume that the solenoid is attached to a water valve. The valve might be stiff or jammed closed due to corrosion or foreign matter inside it, causing the current to increase enough to blow the fuse. If nothing found, get your local pool guru to look at it.
raymo
Last edited by raymo; 17-06-2023 at 02:07 PM.
Reason: more text
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