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Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel.
Normally the 2 flash code is a pressure switch problem but lets make sure and we will go from here.
Excellent let me grab that manual.
OK now I have the manual but my fault codes do not show a 2. Are you getting the number 2 or 2 flashes or what?
What is the serial number, you may have an earlier furnace than what I am looking at which used an earlier board. Serial will be right below model on label
Ok while I am looking do this. Turn power off to furnace thermostat off.Tell me if you still get flash code. Then call for heat and tell me if we get same code
Excellent Standing by. Your furnace was made in 04. but still uses same board.
OK let me ask this. Does the small vent motor come on ?
Then igniter and then burners before you get the code?
How about inducer vent motor or igniter?
This is where are are on chart.
After inducer comes on 30 seconds later we should get spark at igniter. Do we?
Board should be sending voltage to valve automatically for 8 seconds as soon as igniter starts sparking. Are yu saying it sparks but no burners light?
But you get no code like 45 or 47 before the lockout correct?
I am suspecting since you have no numbers they are counting the flashes .Is there a difference in the flashes like short/long ?
The one/one or eleven is a failed ignition error.
Bob I am going to upload you the entire manual, Detailed troubleshooting will be in manual beginning on page 56. Perhaps it will help. Can be a bit difficult via email, but will do my best to help
Rheem and Ruud are exact same furnaces, Rheem uses RGFD and Ruud uses UGFD as model number