HVAC_ air handler/fan

[rednoblue]

I have a Rheem hvac.
The fan will come on for a few seconds and shut off...then come back on for a few seconds then shut off,,,on and on.

I hear a humming from the transformer that I do not remember hearing before. (may have been there) I do not find any loose connections. NOthing corroded.
Nothing feels hot.
Fan spins freely by hand so I do not think bearing.
Outside compressor fan runs normally...(doesnt shut off everytime)

Doesn't matter if fan is on  or on auto.

Is this a transformer issue? or start capacitor?
something else?

Don't know much about hvac but am learning since its saturday night and dont really need to pay for a middle of the night or sunday service call.

Working on getting a pic posted of the board but it may take a while.

Model RHLL-HM3617JA ..installed in december 2010

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also, is this a fire hazard or damaging anything?

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http://i1279.photobucket.com/albums/y539...wte7lw.jpg

[blackhat]

Shut the system off. Now.

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There are several possibilities. It could be the board, it could be a cap or the motor itself. Do you have a multimeter? One with a cap check function?

[rednoblue]

basic multimeter.

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I cannot find anything that looks like a start capacitor.

I am just assuming it should have one.

[blackhat]

Post the model number, I should be able to find a wiring diagram from that.

[rednoblue]

Model; RHLL-HM3617JA
Serial: W311009224

manufactured 7/10

[blackhat]

Sorry, didn't see it first time through.  That unit has an ECM motor, it won't have a capacitor external.  These can be a problem to diagnose.  http://www.hvactechgroup.com/files/ECM%20SERVICE.pdf  That's a diagnostic pamphlet from the motor manufacturer.  I can try and help you through any questions you might have.

[rednoblue]

Thank you so much.
Is the humming from the transformer tell you anything ?

I assume I should not turn it back on until figure out what is wrong?

[blackhat]

All transformers hum, some you can hear, some you can't. It means the transformer is likely alive and well. You shouldn't run it if the blower is not working.

[rednoblue]

I may have not described it well...
the blower will come on and run.
sometimes for a minute or so. then will shut off. ...sometimes for 5 or 10 seconds and then come back on for 20seconds to a couple of minutes or so then shut off for another 5-20 seconds then come back on.

it actually took a while to realize something was wrong as its pretty quiet.
and the house was still cool.

I took the thermostat down and checked the wires. all seem tight and no corrosion.

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it has the  X-13 motor

[blackhat]

OK whole new ball game. Shut down the unit and find the terminal strip in the air handler where the thermostat wires are connected. Remove the stat wires from the R terminal and run a light jumper wire from the R terminal to the G terminal. Power up and see if the fan starts and runs If so, the problem is the stat wiring or transformer. If not, its internal to the air handler/motor. Let me know and I'll help you through next steps.