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If the Easy Touch is reading the correct temperature, but the heater is not - you need to double check the temperature of the pool water with a standard pool thermometer.
Other things to consider:
1) The water is traveling too slowly through the heater. If the water is heating too quickly, then it will shut it off. If it takes a while for this to occur, then this would not be the issue.
2) Thermostat/thermistor is incorrectly reading the temperature of the water prematurely shutting the system down.
Make sure you really are checking the temperature of the water and matching this temperature up with one of the two readings that you are getting. Don't just take the word of the displays on either unit.
This could be a number of things. Most often it will be the internal by-pass. You find the assembly inside the water header, it controls water flow through the heater. When it goes bad it can open at a low temp and keep the water from going through the heater. Also you will want to check the temp probe on the side of the header. If this is bad it will usually show up on the temp display though.
Definitely bad thermistor Pentair reps have seen this happen a lot. Lick finger and touch the two contacts where the thermistor plugs in it should fire up if it's a bad thermistor. If you do an ohm reading you'll find that the ohms do not correlate with the temperature that's displayed. I just trouble shot one and I'm getting 51.2 ohms which equates to 10 - 20 degrees Fahrenheit which is obviously not what is being displayed because it's 126 which is a common number that's displayed when a thermistor is not reading properly
Turn the temp set knobs on the front of the heater all the way up do both pool & spa temp.
If that doesn't help flip the selector switch on the front of the heater the pool temp. This switch doesn't control what heats up Pool or spa it just selects the heater on and which thermistat to use
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