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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond as typing, researching and adding links takes me time to do so please be patient and often I will ask you questions to narrow down the issue to get is diagnosed correctly.
Does the inducer motor run when set to a call for heat and can you get at the board to see the flash error code on it?
3 flashes is a pressure switch code on the unit,can you see the pressure switch and tube for the pressure switch?
Can you take a picture of the code and upload it here? I am not finding that code at all as valid
I see this question is still open if there was nothing more I can do for you please rate my service using the star rating system so I can put this on my done list thanks!