Is this a stand alone water or is it run by a control panel?
If you have a control panel that turns it on then make sure the temp reading for the heater display and the other control panel are the same or within 1 degree of each other.
If it a stand alone heater woh. Onautomation controlling it, you would want to check the actual water temp of the water to see if it matches the heater readout.
If it does then you want to heat it back to 100 , once the service light comes back on, look at the back of the circuit board, most likely you will see a hL-1 or hL-2 with a red lobby next to it.
These are high limit sensors....if one of these has a red light next to it then you need to ensure proper water flow , possibly clean your filter and ensure flow.
If it persists then the issue could be internal heater parts, thermal regulator, bad bypass, failing high limit sensor.
SOURCE: Sta Rite Sr333na Max E Therm Pool & Spa Heater gauge stuck?
Anytime the heater is reading the water temp to be above what it actually is, especially 126, the problem is the Thermistor, or Temp Sensor, for the heater. This is a very easy part to replace. The Thermistor is located on the manifold, on the left side, between the top two bolts.
Sorry this is a late response! Hope that it helps!
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