Outside Unit-split System Heat Pump Screwy - HVAC - DIY Chatroom Home Improvement Forum

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Old 07-08-2008, 07:51 PM   #1
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outside unit-split system heat pump screwy

hey folks. i have trane twr024c split system heat pump for my upstairs that i'm having trouble with. it's 8-10 years old. trouble started this afternoon when my 19 y/o daughter found the digital thermostat (been using for around 4 months) set on "heat" courtesy of my 6 y/o daughter. temp was about 90 degrees. she switched it back to 'cool', but after a while, even though the fan was operating, nothing but warm air blowing out. i looked outside, found the outside unit fan not working. i cycled the breakers, called hunter thermostat's tech support, tuned off air handler and breakers for outside unit for a few minutes.... nothing helped. pulled the top off the outside unit, found if i spun the fan blades with my hand, fan would continue to run. unfortunately, the compressor wont kick on, so coolant line stayed warm. 110 vac at everything i could see to check. does this sound like something familiar to anyone? thanks, eric


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Old 07-08-2008, 08:24 PM   #2
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When you spin it, the fan stays running? If the motor is turning or trying to turn electrically, then it is possible you have bad bearings or a bad motor. Check to see if it has power to it. As for the compressor, if the system has safety pressure switches, the compressor may have tripped off due to high condenser pressure as a result of the fan not running.


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Old 07-08-2008, 08:36 PM   #3
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The above post is exactly correct, I'll go one step further.

If the outside fan is energized (supposed to be turning), and it's not turning, and you give it a spin by hand, and it keeps turning (doesn't coast to a stop), the problem is very likely a bad capacitor.

As stated above, if the compressor runs, but the outside fan doesn't, it'll trip out the high pressure limit. Most of these must be reset manually (push button), some cannot be reset at all and must be replaced.

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Old 07-09-2008, 06:24 PM   #4
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Does the condensor disconnect have 240v or 110v? Check voltage between the incoming power to the diconnect. (from the breaker) It should be around 240 volts.
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