Thermal Well Testing

Thermal Well Testing (cont’d)

Follow the procedure, below, if the water heater gas control has gone into a ECO lockout (4 flash, 3 second pause). Reset the gas control by rotating the setpoint knob to the minimum setting for at least 6 seconds before returning to the desired water temperature setting.

Step 1. Unplug the thermal well connector from the gas control.

Thermal well connector

Step 2. With a multi-meter set to the ohms setting, measure the resistance between the middle and right side wires.

Step 3. 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. If the values are correct, replace the gas control, otherwise replace the thermal well.

Determine Water Temperature Inside Tank

Note: The Determine Tank Temperature section replaces page 23 in the Defender Atmospheric Service Manual, p/n 238-44943-00.

WARNING

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 thermal well is determined using the Thermal Well Testing Procedure on page 21, water flow through the water heater should not occur. Prior to performing the following steps, turn off the cold water supply to the water heater. This will prevent cold water flow into the tank affecting the resistance value of thermal well.

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Bradford-White Corp PE4403S*F(BN,SX) Thermal Well Testing cont’d, Determine Water Temperature Inside Tank

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