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I wonder if there was a OEM issues or a recall on the boards myself I tried to call the manufacturer but they don't like to return calls

Waiting iom manual, to come in ill let you guys know what's wrong with it when I find out. Just also found out students have been trying to trouble shoot this unit for a year now to try to figure out...

I checked with a volt meter

I like that point you made with the parts changing hack, there isn't much of a manual that came with the unit and yes I did clear the board even changed the board.

The burner don't fire off at all right away it gives off that high limit error

Sorry, I was not specific when I said jumped it at the board, I'm an OSU -it student in the HVAC program and am working on this project for extra credit. I jumped it from the back side of the plug...

I have a rheem 90 plus series model number rgfd07emcks over temp limit error 33, right when the unit starts up cold it flashes code 33 over temp limit. I have used the volt meter took it all the way...