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THE FLASHING LEED INDICATES THE ISSUE IS NOT THE BOARD BUT IN AN EXTERNAL COMPONENT OR WIRING.
Tell me which of the following applies to your problem.
1) The ignitor will warm up and glow red
2) The main burner flame will ignite
3) The main burner flame will continue to burn after the ignitor is turned off
The flashing light simply tells us the issue is external from the board.We have to do step by step troubleshooting on this one to determine the issue.It is not like some units that have a 2 flash code to indicate a pressure switch, a 3 flash to indicate a limit, etc.
Since ignitor glows but burners do not light we will go to chart2.(see below)
Follow that flow chart and tell me how far we get
If you do not have a manometer or pressure tester, tell me if you smell or hear gas from the valve?
When you get back to job will you have internet access so we can continue? And do you have a manometer or gauge pressure gauge and a volt meter?
OK lets start when you get there lets try to determine if any gas is coming out of valve when it clicks
Look forward to working with you