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Make sure there is nothing in the flue or intake air pipe. make sure tubing to the pressure switch is clear and that the combustion blower motor is running. If all these are okay the air switch may be bad.
there is something on your Operating System co'z it does not have any problem on your husband's unit. there might be a virus affecting your system that disturbed your installation setup because this type of virus sometimes attack on the drivers and utilities on the registry or drivers
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