GE SG50T12TVT Use and Care Manual - Page 25

Operating Instructions Installation Instructions Safety Instructions Sequence of Operation... 1. During initial start-up or a call for heat, the control will verify the vacuum switch is open. 2. Once the control verifies the blower vacuum switch is open, the control will energize the blower motor for the pre-purge sequence (approximately 5 seconds). 3. The control will verify the blower vacuum switch has closed, ensuring that the blower is functioning properly and that the venting system is not blocked. 4. The control will then proceed through a sequence of selfdiagnostics before initiating a trial for ignition. 5. During the trial for ignition, the pilot will spark in an attempt to light the pilot. Once the pilot flame is established, the main gas valve will open allowing gas to flow to the main burner. 6. The main burner and pilot will remain lit throughout the heat cycle until the water temperature setting is reached. 7. Once the water temperature setting is reached, the control will close the main gas valve and pilot valve which will extinguish both the main burner and pilot burner flames. 8. The blower motor will stay energized for an additional 30 seconds after the control verifies that the burner flame is extinguished in order to clear combustion gases from the water heater. 9. After the post-purge sequence, the control will de-energize the blower motor and go into a stand-by mode awaiting the next call for heat. This water heater is equipped with a flammable vapor sensor that is monitored continuously by the electronic control in all modes of operation. In the event that flammable vapors are detected, the control will automatically shut down the water heater and prevent the water heater from being started again. The following is a list of materials that will cause the Flammable Vapor Sensor to shut down the water heater.  Vapors of Gasoline.  Vapors of certain flammable paints, stains, and thinners.  Vapors of vent pipe Cement & Solvents.  Bleach (direct contact with flammable vapor sensor).  Some other flammable materials and their vapors. If the flammable vapor sensor shuts down the water heater, then the electronic control will display the appropriate error code and you should then promptly contact a qualified service technician. Refer to the "WARNING" on page 3 for additional information. Care and Cleaning Troubleshooting Tips Customer Service 25