Heater reading incorrectly

The pump installer may have relocated the water temperature sensor o another location in your plumbing when your new pump was installed.

Post pics of your equipment pad and show us where the water temperature sensor is placed.

@PoolGate is there water temperature adjustment in iAqualink?
 
I think you have a calibrate function on the iAquaLink. Go to MENU>SYSTEM SETUP>TEMP CALIBRATE. This should allow you to calibrate +/- 4 degrees.
 
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