If you're not accustomed to checking capacitors, I wouldn't advise it. When motors operate with a weak run capacitor, it will cause the motor to struggle and shut down due to the excessive heat/amperage. It's certainly possible that it's time for a new motor and capacitor.
It's both. The motor has thermal protection, therefore it is shutting down on safety. Sounds like the motor needs replaced.
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SOURCE: ruud heat pump outside fan
You may be right in looking at the motor. It uses a different speed on heat than cool. The heat cycle uses low speed, usually red. Some manufactures use blue (medium). Cool uses black, high speed. If you are confident, switch the low speed wire with the high speed and see if this changes anything. If the fan motor isn't the problem, check the other setting (cool) if the overload trips, you may need to look into a new capacitor or compressor, if so, you can install a hard start kit. these are start boosters, and are inexpensice, sometimes they will give another year out of the comp. but I've put them on and they have lasted 5 years.
SOURCE: Compressor fan not running
Does it look like the coils are frosting over? Is it steaming? Keep watching, after about 30 min does the fan come back on?
If yes to any/all the above then the unit is probably in defrost mode and yes the fan will stop blowing during that time, but restart when the unit goes back into regular heat mode.
During this time you will likely notice warmer heat from the vents than normal and the "AUX or EM HEAT" light will be on.
That is your backup heat system. It should automatically come on during a defrost cycle.
SOURCE: Trane air handler cycling rapidly
Depending on the age of your Trane unit. The fan relay has a time delay. This is a solid state board on the relay. Most of the time they stick on or off. Check for loose wires. But start with relay.
SOURCE: Trane XE1200 Fan Motor
Most likely problem with a not-so-old motor is the run capacitor for the fan.
Some units have fan & compressor capacitor combined into one -- others are separate.
The capacitor can be tested with a multi-meter with an MFD setting -- it should read reasonably close to the specs marked on the capacitor.
Charlie
SOURCE: the fan is not movien on my trane high efficienct
If you are sure that the unit has power, look for the capacitor. A run capacitor will be oval shaped with a rupture disc on top. If it is ruptured then the capacitor needs replaced. If it is a round one, the top will be bulged and it will need replace with an exact match. There is a combination type that says fan and herm on it and it can be either of the first two mentioned. If this is not the problem then replace the fan with and exact match
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