Determine Water Temperature Inside Tank - Bradford White HE440S*F Service Manual

Temperature Sensor Testing (cont'd)
Do not use standard multi-meter probes for this testing. Doing so will damage the con-
nector. Use special pin type electronic probes or small diameter wire pins inserted into
connector.
Step 9. With a multi-meter set to the ohms setting,
measure the resistance between the middle and right side
wires.
Step 10. With a multi-meter set to the ohms setting,
measure the resistance between the middle and left side wires.
Determine the correct resistance values using the Determine the Water Temperature
Inside the Tank procedure below. If the values are correct, replace the gas control,
otherwise replace the temperature sensor.

Determine Water Temperature Inside Tank

Stored water may be HOT when performing the following steps in this procedure. Take
necessary precaution to prevent personal injury.
Note: It is important to understand once the resistance for the temperature sensor is
determined using the Temperature Sensor Testing Procedure on page 21, water flow
through the water heater should not occur. Prior to performing the steps below, turn
off the cold water supply to the water heater. This will prevent cold water flow into the
tank affecting the resistance value of temperature sensor.
Determine Tank Temperature
CAUTION
Multi-meter leads
Multi-meter leads
WARNING
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