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check red 4 pin connectors to see if any wires touching if not make sure wires are tight also make sure wire isnt cut or knicked sometimes landscapers do it not knowing seems like shorted wire if you can take controller with shorter wire and try next to aqualink if it works bad wire if not bad controller
Check to see if all 4 wires are connected inside the controller (your inside wall unit) and also at the power center outside. After removing the cover outside you will see a red 4 terminal strip (4 wires) above the buttons. Above the buttons is low voltage, below the buttons where the relays are is high voltage, be careful. Your inside controller (cover pops off from below) has the same red terminal strip that hold the other ends of those same wires. If you have a later model it may use a telephone type connection. If it all looks good call a pool tech who should have a portable controller, he can plug in outside to see what happens. Good luck with it.