I have a Carrier 58sx060 furnace. I just replaced the circuit board attached the wires were they're supposed to go but the fan only runs continuously even when thermostat in set to auto with no heat. Does the new board need to be reconfigured somehow or what could I have done wrong?

Review your installation by checking it against the manual here: http://s3.pexsupply.com/manuals/1266..._PROD_FILE.pdf

There is a troubleshooting section toward the end of the manual.

Well if I tested it correctly the voltage is less than one. How do I fix it?

Voltage measured where?