Rheem/Ruud Silhouette II gas furnace UGPH07EAUER. HSI (ignitor) lights up at main burner head. Gas flows and is ignited at main burner 1st head. There are three burner heads. The flame sensor is located at the third burner head. the gas is not ignited at the 2nd and 3rd heads and because the flame sensor rod does not detect heat the furnace shuts off the gas and cuts the fan off 90 seconds later. Cleaned the flame sensor. Once the main burner flames up I can manually light the 2nd and 3rd burners and the unit will run until the thermostat shuts it down automatically. Help
Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.
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My problem as well thanks for the solution!
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