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Ask poolguy810 Your Own Question
poolguy810, owner - pool and spa service company
Category: Pool and Spa
Satisfied Customers: 1675
Experience:  Servicing pools and all brands of spas for over 28 years.
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I have a pentair 400k minimax heater and my indoor control

Customer Question

Hello i have a pentair 400k minimax heater and my indoor control panel says "water sensor short" when I try to turn on my heater. Any thoughts
JA: How long has this been going on? And how severe is the problem?
Customer: Just recently, I haven't used the spa alll summer. Could it be a temp switch sensor?
JA: Do you plan on doing the work yourself?
Customer: If it's something minor like taking a panel off and buyin the part than yes
JA: Anything else we should know to help you best?
Customer: No that's it,
Submitted: 10 months ago.
Category: Pool and Spa
Expert:  Rick replied 10 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

Sounds like you need to replace the water temp sensor. It's a 2 wire thermistor in the heater water manifold.