Lochinvar & A.O. Smith 100170488 Lower Sensor 30067439-890 or the control board flashing

or the control board flashing a specific sensor-related fault code

While some surface-mount thermostats share physical dimensions

this Single Pole Double Throw relay provides the necessary electrical isolation between low-voltage thermostat signals and high-current mechanical loads like blower motors and fans

which are the industry standard for most residential and light commercial blower assemblies

Built to withstand the high inrush currents typical of AC compressor startup

Lochinvar & A.O. Smith 100170488 Lower Sensor 30067439-890 or the control board flashingThe Lochinvar & A. O. Smith 100170488 Lower Sensor is a critical thermistor based component engineered for precise thermal monitoring in high efficiency water heating systems. As an exact replacement for the TST1188 sensor, this part ensures the control board receives accurate resistance feedback from the lower portion of the tank. For technicians troubleshooting Lochinvar water heater error codes or A. O. Smith temperature sensor faults, installing