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Hi guys, longtime lurker and researcher, but very seldom poster here with a question. I am getting air bubbles in my return lines....no water is leaking at the surface, though I do have a underground leak somewhere - if I close my fill valve on a cloudy day in the 60s I lose about an inch every...

My Aqualink RS4 controller has stopped being accessible. No lights, no text, buttons don't affect function. But my program is still running. The pumps come on and shut off as scheduled. Is it dead? Can I test it? Can I fix it? If no, can I replace it? thanks for any advice and assistance...