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cullinator · Nov 21, 2011, 12:41 PM

Just started up furnace for the year. Ran OK for a day. Now furnace ignites then blower fan starts will run, stop for a bit, start again, stops, and eventually it starts again and runs until temp is maintained to thermostat setting.

mygirlsdad77 · Nov 21, 2011, 05:20 PM

How old is your goodman? Sounds like you have a temperature activated fan control, instead of a time controlled device. I would take a look at the fan control.

cullinator · Nov 21, 2011, 05:38 PM

Not sure of fan control. Furnace 5 years old. Had a local tech look he first tried changing the board with no change to blower performance. He thinks it's the blower motor. The board light is not blinking at all. I don't think he knows for sure so like most local techs here solution is just keep throwing parts at it eventually it will work.

mygirlsdad77 · Nov 22, 2011, 05:23 PM

5 years old? That blows my theory. Okay, so a newer furnace, and the board has already been replaced. It does indeed sound like either a bad fan motor, or simply a bad fan motor capacitor. Here's the thing. If the motor doesn't fail while the tech is there, it is very hard for them to trouble shoot the problem, which many times leads to unnecasary parts replacement. I never replace parts without seeing the actuall problem occur. It can mean repeated trips, but usaually pays off. I would suggest having the capacitor checked before replacing the complete motor. I have seen bad caps cause this numerous times. I would also suggest (if they can catch the motor failing) testing for power to the motor when it stops running. If there is power to the motor and it stops running, it is either a bad motor, or bad capacitor. If power is lost to the motor, then the problem is further back, most likely in the control board, but that has already been replaced. Good luck and please do let me know the final outcome on this.

cullinator · Nov 22, 2011, 08:21 PM

Tested the cap it read 11.6 if that sounds right? Not a tech but have a tester. I will try testing the power wires to the motor like you suggest and will see what happens. Thanks for the help I will report back with my findings.

mygirlsdad77 · Nov 24, 2011, 12:31 PM

What's the uf rating on the cap? And does your tester have a uf setting? If the 11.6 is in uf, then it sounds in range, all depends on the sized of the cap. They are usually marked with a + or - 5 or ten %. So Im guessing you have either a 10uf or 12.5 uf cap. Do the test for power to the motor when it stops, this will tell a lot.

One last thing. Make sure you have good airflow. No plugged filter, or return grills. Lack of airflow can cuase the motor to go out on overload, then once it cools off, it will start up again.

cullinator · Nov 24, 2011, 03:17 PM

Well think the damn furnace is haunted. Ever since I got tester on hand it has not acted up. Listen for it during the night and nothing has tripped lately. It seems to have better air flow for some reason not sure why though. Replaced filter before, and took coil out it was clean.

mygirlsdad77 · Nov 25, 2011, 04:00 PM

Well, fingers crossed. Maybe it was a loose connection on the capacitor? Good luck, and please keep me posted.