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Old 06-13-2012, 12:00 PM   #1
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Trane XB 13 Condenser Fan


I have a Trane XB 13 unit, AC/Heat pump. The unit sounded different a few days ago and then the fan stopped running. Load buzzing noise now coming from the unit. Killed the power. Drip pan has been drained and cleaned. Turned power back on and the fan ran again for 5 minutes and then shut off. Load buzzing noise was still there. Fan spins freely and the capacitor does not appear to be bulged.

Anyone have any ideas? I am thinking of replacing the fan motor and replacing the capacitor as that will probable cost the same as a service call.

Fan # K55HXJPM-9251 Emmerson 1/6
GE capacitor - 97F9899

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Old 06-13-2012, 04:24 PM   #2
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Trane XB 13 Condenser Fan


If it is the condenser fan, Check the contactor first.

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Last edited by clocert; 06-13-2012 at 07:17 PM.
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Old 06-13-2012, 06:10 PM   #3
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Trane XB 13 Condenser Fan


Okay, when you mention the drip pan it leads me to wonder if you are talking about the indoor blower motor, not the outdoor condenser fan motor...?
...In which case it could be the blower relay.
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Old 06-13-2012, 06:31 PM   #4
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Quote:
Originally Posted by Johnny0873 View Post
Load buzzing noise now coming from the unit.
The (relay) noise was always there but was masked by the fan noise? Could also be a high resistance connection causing a relay to oscillate.
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Old 06-13-2012, 08:57 PM   #5
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Trane XB 13 Condenser Fan


I cleaned the drip pan as I thought the float may have been the issue. It is definitly the outside motor unit. Happened tonight again. Ran for 5 minutes and then the motor slowed and shut down.

I checked all the connections and they don't look burned. Circuit board is blinking green.

Appreciate everyone's feedback. If its something I can handle, I would like to give it a try. Otherwise, I know when its time to call a professional.
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Old 06-13-2012, 09:22 PM   #6
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Quote:
Originally Posted by Johnny0873 View Post
Happened tonight again. Ran for 5 minutes and then the motor slowed and shut down.
A thermal cut-out in the motor is kicking out because of overheating and the five minutes represents the thermal inertia of the motor?

Measuring motor current may give a clue in this case. If the current is normal maybe the cut-out itself is faulty.

You could also try wrapping the motor with a plastic bag full of ice for a half hour or so and then see if the cooled motor goes for more than the five minutes.

Last edited by Yoyizit; 06-13-2012 at 09:24 PM.
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Old 06-13-2012, 10:38 PM   #7
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Trane XB 13 Condenser Fan


Johnny,
Do you have any electrical testing instruments? Like an ammeter, or volt meter?
Can you get to the motor to see if it is hot to the touch right after it shuts off?
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Old 06-13-2012, 11:24 PM   #8
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You said it is the outside unit. also the circuit board is blinking..WHERE is this circuit board ??
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Old 06-14-2012, 07:36 AM   #9
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Quote:
Originally Posted by TopTechnician View Post
Johnny,
Do you have any electrical testing instruments? Like an ammeter, or volt meter?
Can you get to the motor to see if it is hot to the touch right after it shuts off?
Yes Sir, I will check if the motor is hot today. Forgot to check that!
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Old 06-14-2012, 04:15 PM   #10
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TTB is basic condenser , shouldn't have a board with light, what is the system's model number?
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Old 06-15-2012, 08:58 PM   #11
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The 'load buzzing noise' is likely the compressor running at high pressure. You can't tell if a capacitor is bad by looking at it (unless it's bulged, but they don't always bulge). 1st thing I would do if you don't have a meter to measure the mfds is to replace the fan capacitor. at $5-$10, you don't lose much by trying. If the problem continues, it's likely the motor. For the capacitor, get the exact mfd (uf) rating and the same VAC or higher (i.e., 370VAC or 440 VAC).
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Old 06-16-2012, 10:00 AM   #12
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Trane XB 13 Condenser Fan


Quote:
Originally Posted by AirstarFilters View Post
TTB is basic condenser , shouldn't have a board with light, what is the system's model number?
it would have a board.... he said it was a heat pump
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Old 06-16-2012, 08:52 PM   #13
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Quote:
Originally Posted by rightit View Post
The 'load buzzing noise' is likely the compressor running at high pressure. You can't tell if a capacitor is bad by looking at it (unless it's bulged, but they don't always bulge). 1st thing I would do if you don't have a meter to measure the mfds is to replace the fan capacitor. at $5-$10, you don't lose much by trying. If the problem continues, it's likely the motor. For the capacitor, get the exact mfd (uf) rating and the same VAC or higher (i.e., 370VAC or 440 VAC).
Replaced the contactor, and was planning to replace the capacitor but was sent the wrong part. Same problem. Waiting on the new capacitor before I change the motor. Must say, spiders love nesting in there. $20 well spent on swapping out the contactor. Thanks again to everyone.

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