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Coast spas flash 52 or S2


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I just bought a used spa. When i start it up the Topside display flashes 52 or S2 once a second...the system is GECKO and if I remove the wire to the HIGH LIMIT PROBE the pump starts and the display now display 0 and I can start pump speed 2 and turn on light....the water doesnt seems to get warmer, nor can i reg any power gooing to Heather or flow switch 

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