Heater reading higher than actual temperature

[Middy]

Hello. I have a PentAir Master Temp 400 Heater. It definitely turns on, however, my panel is reading the water temperature at a much higher degree than the pool actually is. For instance, pool water about 60-65 panel reads 78-80. The air temperature is accurate.

I ordered a water temperature sensor today and thought I would try this inexpensive try.

Is there anything else I should be looking for? I am no pool professional but am quite handy and willing to learn and try to fix it myself.
Any help and advice is very much appreciated.

Donna

 

[PoolGate]

Try swapping the air temp with the water temp. They are usually the same probe. If it reads correctly after the swap, just get a new temp probe.