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There could be several reasons why a Petra package unit did not start after a fan was changed. Here are some possible causes:
Wiring issues: When changing the fan, it's possible that a wire was disconnected or connected improperly. This can prevent the unit from starting. Check the wiring connections to make sure they are secure and in the correct location.
Capacitor failure: The capacitor is an electrical component that helps the fan motor start and run. If the capacitor is faulty, the fan may not start. Check the capacitor with a multimeter to make sure it is within the acceptable range of values.
Motor failure: If the motor has failed, the fan will not start. Check the motor with a multimeter to see if it is receiving power and if it is within the acceptable range of values.
Thermostat issues: The thermostat may not be sending the correct signals to the unit to start up. Check the thermostat and make sure it is set to the correct temperature and mode of operation.
Circuit breaker tripped: Check the circuit breaker to make sure it hasn't tripped. If it has, reset it and see if the unit starts.
Control board failure: The control board is the brain of the unit and controls all of its functions. If the control board has failed, the unit may not start. Check the control board for any signs of damage or malfunction.
If none of these solutions solve the problem, it may be best to consult a certified technician who can diagnose and repair the issue.
Window AC units normally have two motors. One motor spins both the inside and outside fans. This motor may be PSC (permanent split capacitor) with a run-capacitor. Test the capacitor or just replace it if it is old and you don't have test meter(s). The other motor is inside the sealed compressor unit. This will be overheating if the first motor was not running at full speed due to a failing run capacitor. The thermal check will auto-reset but the compressor motor most likely cannot start until it is cooled completely down by being turned off for an hour or more. There is also a run capacitor on the compressor motor. Test and/or replace. If this does not correct the problem I do not recommend further repairs as most window units are cheaper to replace -- labor will be high on changing a compressor, fan motor, or coils and expansion valves.
I have omitted advise about cleaning coils and fans and filters, but if you find a lot of dirty build-up then clean those first before moving on to motor issues.
the answer to your problem is most likely the motor start capacitor. A AC motor can run in both directions. The start capacitor is used to cause the current to lag behined the voltage which determines the direction the motor will turn. Its posible the start and run capacitors are in one can. so changing one will change the other. However look for a wiring diagram. Do not asume that both capacitors are wired in properly. They may be fighting one another causeing premature failure.
Hi ace, If there are two capacitors in the air cond, the smaller one belongs to the fan motor. Shut the power off, and take the capacitor out after marking where the wires go. There should be a place on the capacitor that tells you the mfd (microferad). Most fan motors these days have a 7.5 or a 5 mfd capacitor if it is a home unit. These capacitors are not expensive, but you should always put a new one in every time you change the motor. If you only have one capacitor in the unit, you will have to change it. It will be a 3 post capacitor that runs the compressor and the fan. It will have markings on it that have two different mfd ratings, one for the motor and one for the compressor.Be sure to mark where the wires go! Hope this helps you get your cool back on. Mark
Please check your compressor whether it takes correct amphs. Due to weak in capacitor and also less rpm of fan motor the compressor gets overheated and it turns the unit off. If capacitor weak change it. If less rpm on fan motor change fan capacitor or fan motor.
The fan motor uses a capacitor to turn the motor and if the capacitor is bad the fan won't rotate.If you are handy you could remove the electrical panel and change the capacitor and it will work fine again.I have tested these fans by simply turning the unit on and spinning the fan blade by hand!!! if the fan operates then the capacitor is bad!!
be aware that not repairing this asap that you are causing yourself more problems First I would change out the fan capacitor and see if this could be the problem. Secondly if the capacitor isn,t the problem change out the motor . By continuing to allow the system to cycle like this the compressor will take a dive on you costing more . Good Luck
If you have power to the fan and the fan won't come on, then its bad. You don't have to do another check. You will know if the capacitor is bad by turning the power on to the unit and taking a stick to start the fan. If the fan starts running after manually spinning, then the cap is bad. If not, the motor is bad.
these motors are famous for the inyernal fuse blowing in the fan motor. check continuity between the red and blac wires. if there is non the fuse is gone. These motors are fairly easy to take apart and change the fuse . hope this helps
Hi James Coley, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
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