Have HVAC Questions? Ask an HVAC Expert for Answers
All work to be done by licensed professional. WE KEEP GOING UNTIL YOU HAVE THE INFORMATION YOU NEED, I come and go. This is step ONE.
Hello. Welcome to Just Answer.
The first step in resolving this issue for you is discussing that is going on with the unit.
The outside fan will not kick on. Only the compressor runs until it trips the breaker
Regarding the outside unit... with the compressor in it... if the compressor runs without the fan running it will only run for a few seconds before it cuts off on its internal over loads or the units high pressure cut out switch.... unless it has any of the following other issues:
See of the fan spins freely when you push it, or if its stiff
Yes It does.
We have two units. I have swapped fan motors, contactors, capacitors.
and fan still doesn't run
In that case the motor windings are burnt out...or... its run capacitor has failed.
The motor and the capacitors run in the other unit
In that case there is a bad wire connection between the compressor/ fan contractor and the motor... a burnt wire terminal, or a bad wire splice.
Use a volt meter to check for 230 volts across the two wires that feed Line 1 and Line 2 power at the motor wires you disconnected when you tried it in the other unit.
There will likely be no power there... it is just a matter of tracing those two wires back until you get a 240 volt read between them... the bad connection will be at that spot.
Let me know how it goes, we keep at it until the situation resolves.
I have checked the voltage on each leg. I have 120 volts on each leg. I have checked with a good volt ohm meter. I will check again
Thats not a good way to check the power.
ok. I will check it the way you recommended.
If one leg is failed, you will get 110v to ground at either of the legs...due to feed back through the motor... but one leg will not run the motor
You need 240 volts *between* the two legs in order to run the motor.
One of those wires has a bad connection.
thanks. I will go look now. I see, said the blind man :)
We stay with this until the situation resolves, just post when you need more data or you can accept and rate my work any time you like.
I had zero volts across the motor. I repaired an open in the wiring and now I have 240 volts and fan is running. Thank you.