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If I jump out the pressure and other switches I assume it will not do anything if the board is bad. What do you think?

I have a 15 year old Raypack 2100 Digital Natural gas heater. Body a little rusted but I have kept it in good shape by winter storage. The unit is a 400,000 BTU model. I cannot fire it up this season. I get an error code of PRS for a pressure problem. I have replaced and tested a new pressure...