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is this a new boiler or how old is it and when did this start?
are you able to remove the cover and check the wiring between the board and the blower?
yes, that will switch the polarity of the blower itself. verify that X2-1 is Blue, X2-2 is White, X2-3 is black, X2-4 is red, X1-6 is green, x1-2 is white, x1-1 is Black
splice what wires? are all those wires on the correct terminals?
you said you switched the polarity before? how did you switch it without removing those wires. by the way why are you trying to switch the polarity?
that is a different issue, we want to verify the correct polarity at the boiler. do you have 11 from X1-1 to X1-6?
sorry 110 volts from X1-1 to X1-6