Step 1. Rotate knob of combination thermostat gas valve to the off position.
Step 2. Remove the outer jacket door.
Step 3. Remove inner door per Service Procedure RG-I, Steps 3a through 3e.
Step 4. Disconnect the main burner feed line, pilot tube, and thermocouple/thermopile from combination thermostat gas valve and remove burner assembly from the combustion chamber.
NOTE: Feedline nut for natural gas control uses right hand threads; L.P. control uses left hand thread.
Step 5. Clean ScreenLok ® Flame Arrestor using stiff brush and compressed air to remove any scale or other debris accumulation. Using a soft brush, clear jacket openings of any dirt, dust, restrictions, or other obstructions.
Step 6. Remove any debris from burner assembly per Service Procedure RG-V and reinstall burner assembly into combustion chamber.
Step 7. Reconnect feedline, thermocouple, and pilot tube to the combination thermostat/gas valve.
Step 8. Reinstall inner door per Service Procedure RG-I.
step 9. To resume operation, follow the instructions located on the lighting instruction label or the lighting instruction located in the Installation and Operation Manual.
