Upper Temperature Sensor Testing - Bradford White ERE240 Service Manual

Upper Temperature Sensor Testing

1. Turn all power to the water heater "OFF".
2. Remove access cover to upper handhole and remove insulation
3. Check the 5 pin connector on the back of the control to ensure it is connected properly by removing the connector,
inspecting the pins on the control board, and carefully reseating the connector.
4. Either remove the shock protector or flip the protective lid up to access the temperature sensor.
5. Inspect the temperature sensor to make sure that it's firmly affixed to the tank wall and that the connectors attached to the
wire harness are in good condition.
6. Set the multi-meter to Ohms (Ω).
7. Check the resistance between the two leads (Figure 8). Depending on the tank temperature, the sensor should read
between 1.2kΩ and 33kΩ.
a. If the resistance is out of this range, the temperature sensor and upper limit assembly needs to be replaced.
b. If the resistance is within this range and the connectors look good the upper temperature sensor is functioning
properly.
8. Replace shock protector, insulation, and upper handhole access cover.
High voltage exposure. Be sure power is
"OFF" when performing this procedure.
Figure 8
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SERVICE PROCEDURE
Upper Temperature
Sensor Testing
WARNING
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