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FWIW - ALP was great with the warranty return. I had to mail back the original/bad sensor and received a new one in about a week.

FWIW - Your're suggestion was a good one. I simply switched the ports at the control box and confirmed it was isolated to one cable/sensor. It took me a while to get around to opening up the back...

Greetings,

I am getting a verbal warning - "Warning - sensor not found - R1" each time I power up. I have tried plugging/unplugging the sensor cables from the main control unit. When I unplugged...