Pool and Spa
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Watchdog error USUALLY are from the sensors being out os sync. I have found if you replace both the high limit and Thermostat sensor it will usually fix the problem. In rare cases I have found watchdog to be a bad circuit board but again this is rare. Find where the two sensors plug into the circuit board then trace the wires back to the sensors and replace. The high limit sensor is on or near the heater housing and the thermostat is usually in the filter box or surrounding area.