Water Temp Sensor

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J

jsoto58

Member
May 2, 2024
19
Houston
How do you check to see if the water temp sensor is working that does to a Pentair Panel?

My MasterTemp 400 shows erratic temperatures on the board. It is controlled by my Pentair Panel. It goes through the startup of 128 r13 but never starts. It initially shows a temp of 78 and then jumps to 120 something and stays there.
I checked the Thermistor and it shows 9.5 ohms. I had a spare one that I installed and still the same results.
It was working fine a couple of days ago, but now no go.

Any ideas?
 
I placed a 10k ohm resistor on the thermister. The heater went through the initialization (128, R13) and then briefly showed 76 then jumped to 99 and then back to 76/77 and back to 99 and stayed there. The heater never tried to start. ET shows correct water temp and the setpoint was greater than water temp. No error codes present.
Heater was working fine last week.

Is this a board problem?
 
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