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when it comes on does the flame actually occur but go out 3 seconds later?
flame comes on and goes out in a few seconds
The flame definitely makes contact with the flame rod within 3 seconds
No but will be trying that tomorrow to see if that works
We cleaned the flame sensor and it came on for a bit more than 3 times then went back off. Then I turned it back on when I got home and it is doing the same thing again. All wires seem to be grounded. Not sure about the ignition control but it seems like it is igniting.
The issue turned out to be that there are 2 vents on this unit and there is a piece goes on the bottom of one of them that helps blow air away from the unit and it was installed on the wrong one causing air on a non-windy day to get sucked back into the other vent and blow the flame out.