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Page 22
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.
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.
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.
WARNING
Stored water may be HOT when performing the following steps in this procedure. Take
necessary precaution to prevent personal injury.
Thermal Well Testing
Thermal well connector
22