Air conditioning compressors this is usually due to one of two conditions: time and hours of operation (wear) or abuse. There are some drawbacks that may occur in other parts of the system, leading to a compressor failure, but they occur less frequently if the system was not substantially violated.

Typically, abuse is the result of long work with the improper charge of freon, or as a result of improper service on the road. It is inappropriate services may include overcharging, low prices, incorrect installation of starter capacitor as a replacement, removal (instead of the repair / replacement) thermal limiter, not oil, mixing incompatible types of oil, butter or incorrectly, the installation of a installation houston on the system, which is the main burnout without adequate measures to remove the acid from the system, improper installation of the compressor (too small) for the system, or installing a new compressor on a system, which was another failure, that was never diagnosed.

Compressor can not only in a few different ways. He can not open, Fail is closed, the experience of the refusal or inability of piston (casting rod), or the experience of valve failure. That is almost the entire list. When the compressor fails open, the wire inside the compressor breaks. It is not beyond repair and the symptom is that the compressor is not working, although it can roar. If the compressor can not be opened, and the next steps are not correct, then the system can be a good candidate for a new compressor. This failure does not cause any further failures and not hurt the rest of the system, if the rest of the system is not old it would be cost effective to just put a new compressor in.

Testing for a failed open compressor is easy. Pop electrical cover for the compressor, and remove the wires and the thermal limiter. Using ohmmeter, measure the resistance from one terminal to another in all three terminals of the compressor. In addition, measurement of resistance in the case of the compressor for all three terminals.

You should read low resistance values for all terminal to terminal connections (a few hundred ohms or less), and you should have a high resistance (several kilo-ohms or higher) for all terminals to case (which is land). If any terminal to terminal communication is a very high resistance, you could not open compressors. In very rare cases, could not open compressors can show low resistance to earth from one terminal (which will be one of the heating repair with the failed open). In this case, the breakage of a wire was moved and connected to the case. This condition - which happens rarely, but not impossible - can lead to a trip switch and can lead to misdiagnosis of failed short. Be careful here to test the contents of lines, before deciding how to proceed with repairs.

When the compressor fails in short, what happens is that the insulation on wires is erased or burned or broken inside the compressor. This allows the wire to the coil to the touch, then it should not touch - most of the rotation or two further along the winding. This leads to a "short coil, which will stop the compressor immediately and cause it to heat up and burn within the country.