The Ways An Air Conditioner Compressor Can Fail, and What To Do About It

Air conditioning unit compressors usually fail credited to one of two conditions: time and several hours of procedure (wear out), or abuse. There are some failures that can happen elsewhere in the system that will cause a compressor failure, require are less common except if the device has been considerably abused. kompresor

Usually abuse is a result of expanded running with improper freon charge, or as a consequence of improper service along the way. This kind of improper service can include overcharging, undercharging, installing the wrong starter capacitor as a replacement, removing (rather than repairing/replacing) the cold weather limiter, insufficient oil, blending incompatible oil types, or wrong oil, installing the compressor on a system that a new major burnout without taking proper steps to remove the acid from the system, installing the incorrect compressor (too small) for the system, or installing a fresh air compressor on a system that had some other failing that was never clinically diagnosed. 

The compressor can are unsuccessful in just a few of different ways. That can fail open, are unsuccessful shorted, experience a putting failure, or an intervention failure (throw a rod), or experience a device failure. That may be pretty much the complete list.

If an air compressor fails open, a cable inside the compressor gaps. This is unserviceable and the symptom is that the compressor does not run, though it could sound. If the compressor falls flat open, and following the steps here does not fix it, then this system may be a good prospect for a new compressor. This failure triggers no more failures and won’t damage the snooze of the system; if other system is not decrepit it would be cost effective in order to put a new compressor in.

Testing for a failed open automotive compressor is easy. Pop the electrical cover for the compressor off, and remove the wires and the thermal limiter. Using an ohmmeter, gauge the impedance from one terminal to a new across all three ports of the compressor. Likewise gauge the impedance to the case of the compressor for all 3 terminals.

You should read low impedance values for all terminal to fatal connections (a few 100 ohms or less) and you should have a high impedance (several kilo-ohms or greater) for all terminals to the situation (which is ground). If any of the terminal to terminal connections is a very high impedance, you have a failed available compressor. In very uncommon cases, a failed open up compressor may show a low impedance to floor from one terminal (which will be one of the terminals associated with the failed open). In this case, the damaged wire has moved and is also contacting the case. This kind of condition – which is quite rare but not impossible – could cause a breaker to trip and could cause a misdiagnosis of failed brief. Be careful here; do an acid test of the contents of the lines before deciding how to proceed with repair.

When a compressor falls flat short, what happens is that insulation on the wires has worn off or burned off or broken inside the converter. This allows a cable on the motor winding to touch something it should not touch – most commonly itself a change or two further along on the motor turning. This results in a “shorted winding” which will stop the compressor immediately and lead it to heat up and burn internally.

Poor bearings can produce a failed short. Either the brake rotor wobbles enough to make contact with the stator, resulting in insulation harm that shorts the brake disc either to ground or to the stator, or end bearing wear allows the stator to move down over time until it commences to apply against the stator draws to a close or the housing.

Generally when one of these shorts occur, it is not immediately a hard short – meaning that primarily the contact is intermittent and comes and goes. Each and every time the brief occurs, the compressor rpm drops sharply, the converter may shudder somewhat noticeably as a result, which shudder shakes the turning enough to separate the short. While the brief is in place, the current through the shorted winding shoots up and lots of heat is produced. Also, usually the short will blow some sparks – which produces acid inside the air conditioner system by decomposing the freon into a mixture of hydrochloric and hydrofluoric acid.