Bradford-White Corp Eco Defender, U130T*FRN warranty Chamber Sensor Testing

SERVICE PROCEDURE ED-V

Gas Control Replacement Thermal

Well and Chamber Door Sensor

Testing and Replacement

CHAMBER SENSOR TESTING

Step 1. Turn the gas control knob to the “OFF” position

Step 2. Disconnect the chamber sensor wire harness from the gas valve.

Step 3. Remove the chamber door temperature sensor from the right side inner door (Phillips screw driver).

Step 4. Make sure that the ring terminal of the chamber door temperature sensor is not touching any surface. Using a multi-meter set to the ohms setting, insert one meter probe (see caution) into each of the wire positions (see photo 5).

Step 5. Measure the ambient air temperature near the sensor. Compare the ambient temperature range to the expected resistance range on the chart below. Note that resistance increases as temperature decreases.

Gas Control Knob Shown In

“OFF” Position

Chamber Door

Temperature Sensor

Wire Harness

5

CAUTION

DO NOT use standard multimeter probes for this test. Doing so will damage connector. Use special pin type electronic probes or small diameter wire pins inserted into connector.

Sensor Resistance at Various Temperatures

Temperature Range (oF) Resistance Range (kOhms)

41-50	279-175
50-59	219-139
59-68	173-112
68-77	137-90
77-86	110-72
86-104	89-59
104-113	73-48
113-122	60-39
122-131	49-32

Step 6. Replace the chamber door temperature sensor if it it out of specification.

Step 7. Secure the chamber door temperature sensor to the right side inner door using the screw from step 3. Step 8. Connect the chamber door temperature sensor wire harness to the gas valve.

Step 9. To resume operation, follow the instruction located on the lighting instruction label or the lighting instruction located in the installation and operation manual.

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