SERVICE PROCEDURE AG-III
Gas Control Testing and Replacement
For Models using White Rodgers or
Robertshaw Gas Control
ECO (Energy Cut Off) TESTING
Step 1. Disconnect thermocouple from gas control.
Step 2. | Using a multimeter capable of measuring Ohms (or continuity), |
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| attach one lead (alligator clip) to the pilot tube. Insert the other lead |
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| (probe) fully into the magnet opening, Be sure the probe makes |
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| contact only at the top center of the magnet opening. Do not allow | Figure 23 |
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| the probe to make contact with the threaded sides of the opening. |
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Step 3. | If continuity is indicated, the ECO is OK. If continuity is not indicated, the ECO has opened and the | ||
| gas control must be replaced. |
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GAS CONTROL REPLACEMENT
Step 1. Rotate knob of the gas control
to the “OFF” position.
Step 2. Turn off gas supply to water heater.
Step 3. Disconnect gas supply line from gas control.
Step 4. Turn off water supply and drain water heater completely.
Step 5. Remove outer jacket burner access door.
Step 6. Slide open inner combustion chamber door.
For White Rodgers gas control, depress knob slightly and rotate clockwise to the “OFF” position.
Figure 24
For Robertshaw gas control, rotate knob clockwise to the “OFF” position.
Figure 25
Figure 26
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