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condenser fan blades are cover with lint or the fan motor may be going out. Clean fan blade first before doing anything else. If noise stops after cleaning the fan blades; hooray! If not you might have to replace the fan motor itself. Test and re-check before taking other step(s)
The fan has a setting for high speed, low, and off.Fan only running at low speed.This indicates problem towards.1) the fan motor.2) The loose fan wiring.3) The fan switch.IN the unit there is a motor for fan.If the motor gets weak or short. The fan will run but only at low speed.Because at high speed the motor will require more power to run.In this case motor needs to be checked and replaced.The other possibility is the fan wiring.There are two wires going from fan to motor and two going from motor to power board.If any of this wire is got loose or getting short then this will stop the fan to run in high speed.In this case the wires needs to be checked and reconnected properly.In the unit there is a switch internally.When you select the fan to high speed mode the switch goes up. when you select the fan to low speed mode the switch turns down.But if the switch is faulty or got worn out.Then it will not move properly up/down.In this case switch needs to be replaced.IN some brand models the High speed and low speed are directly controlled from front control panel.There is no switch in that models.In that case the control panel needs to be checked and replaced.Thanks. keep updated for any more query.you can rate this solution and show your appreciation.
Maybe your blower fan is faulty.
The whine you heard could be dry/seized fan motor bearings or foreign matter (such as leaves/twigs) in the fan.
If fan motor is faulty it will need to be removed for repair; but first check as below:-
1) Check fuse is ok.
2) Check motor runs if power applied directly to it. - If motor OK, check:-
3) speed resistor module (usually in fan ducting, in air flow),
4) fan switch operation.
If the unit is working fine in heat mode and in fan only mode, you have a short in the wiring going to the ouside unit. If it were a fan relay, then everytime the fan came on the breaker would trip. But either way, there is a low voltage short taking place in the unit. If the compressor was bad, the indoor unit would run fine and would only blow the breakers to the ouside unit. I had a unit last summer that did the same exact thing. After I replaced the control wiring to the outside unit, everything worked like a charm. Good luck!
with a forced draught burner the fan motor would be checked via a pressure switch. if the pressure switch is not set correctly or the fan is too weak the contacts will not be made in the switch and the burner will lockout. if the damper is not open enough when the fan runs then the air supply will be too small for the switch to make. check to see if you have a capacitor on the fan windings if this is faulty then the fan will fail intermittently.
I need to verify you have adaquate air flow, to cool the motor. If you have a window open, and the crawl hole open is there enough air flow into the the attic? It there is enough air flow and it still stops after about an hour, does this unit have a humidistate and a temperature switch on the housing or extension. If all the switches are working correctly then I could be the motor overloading/heating shutting down and then reseting. InMrFixIt