Pool and Spa
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Hello and welcome to JustAnswer! This is James, I'm a Pool & Spa Engineer with over 20 years of experience, and I'll be assisting you today.
Sorry to hear your appliance is having issues, please stand by while I find the answer for you, this is not an immediate service however I will try and respond as soon as possible.
Where you have two dashes " - - " shown on the display then yes this would normally suggest either the sensor or the wirring harness to the temp sensor is faulty.