My pool heater (pentair mini-max nt) mis-reads the temperature. It says 85 on the red led display of the heater. But the remote reads 61 and the actual temp is 63 measure by thermometer. When we try to heat the spa it shuts down prematurely. When we try to heat the spa, the heater reads 111, but the actual temp is 76 and so its stops heating. If this is temp sensor problem, which and where do i replace?
Your temp sensors are on the heater, a small tube that slides into the water manifold, usually on the left side. On the remote it will be in one of the pipes coming from the pump or the filter. If it is after the heater you should move it to between the filter and heater. It will be a tube that is in the pipe with a stanless steel clamp holding it in place.
To find out wich one it is you will need to remove the remote from the system by takeing the wires that go to it from the wireing inside the heater and wire nuting the wires in the heater together. If the heater runs normal then it is the sensor for the remote if not it is the sensor for the heater. Let me know how you do and if need be we can get a little more specfic for your system. good luck.
If your remote has a menu, scroll to "calibrate". Then lower the preset temp. you would like. Start out only a few degrees at a time and wait for an increase in the actual temp of the spa. Put a pool thermometer in the spa to monitor the actual temp. You don't want to "over shoot" then it will get so hot that heater might have problems when it trys to restart.
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