RDspaguy Posted July 20, 2021 Report Share Posted July 20, 2021 The sensor, or a manual high limit switch on the heater? Either way, no. But testing from a heater lead to a sensor lead could fry your sensor, since they are low voltage. Quote Link to comment Share on other sites More sharing options...
Smith87 Posted July 20, 2021 Author Report Share Posted July 20, 2021 2 hours ago, RDspaguy said: The sensor, or a manual high limit switch on the heater? Either way, no. But testing from a heater lead to a sensor lead could fry your sensor, since they are low voltage. The high limit relay and heater relay Quote Link to comment Share on other sites More sharing options...
Smith87 Posted July 20, 2021 Author Report Share Posted July 20, 2021 No just unplugged the heat sensor/ on the heater tube & Tub housing as well as the pressure switch none of the three show any resistance Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted July 20, 2021 Report Share Posted July 20, 2021 The pressure switch should only close when the pump is on. The two sensors have resistance in the tens of thousands of ohms, so you need a decent ohm meter set to the 20k setting if adjustable. With the heater circuit on you should not get voltage between the high limit and heater relay on the same leg, but will get voltage from one leg to the other. With the heater off you should have voltage across the heater relay if the heater is connected, so voltage to high limit only on one side of the relay. With heater disconnected there should not be voltage on anything but leg to leg. Quote Link to comment Share on other sites More sharing options...
Smith87 Posted July 20, 2021 Author Report Share Posted July 20, 2021 My meter has 20k ohms still noth 12 minutes ago, RDspaguy said: The pressure switch should only close when the pump is on. The two sensors have resistance in the tens of thousands of ohms, so you need a decent ohm meter set to the 20k setting if adjustable. With the heater circuit on you should not get voltage between the high limit and heater relay on the same leg, but will get voltage from one leg to the other. With the heater off you should have voltage across the heater relay if the heater is connected, so voltage to high limit only on one side of the relay. With heater disconnected there should not be voltage on anything but leg to leg. ing Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted July 20, 2021 Report Share Posted July 20, 2021 That would be extremely unlikely for both sensors to read open. They rarely fail like that. Quote Link to comment Share on other sites More sharing options...
Smith87 Posted July 20, 2021 Author Report Share Posted July 20, 2021 Story of my life haha 25 minutes ago, RDspaguy said: That would be extremely unlikely for both sensors to read open. They rarely fail like that. Quote Link to comment Share on other sites More sharing options...
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