My accentra is five years old, other than a past ignition problem it runs trouble free, until this year. Since starting it this fall it has developed a loud hum and a definite vibration. The noise and vibration begin when the combustion blower comes on with start up ( the red light is on for the combustion-blower). Today I checked the fins on the fan and they are not bent and the area is clean. Could I need a new combustion motor? Any help would be appreciated. Thanks
