What are the common symptoms of a faulty Air Conditioner Transformer?

Common Fault Symptoms of Air Conditioner Transformer

1. Power Failure or No Response
When the internal coil of the transformer is damaged or the insulation fails, the main control board of the indoor unit will not receive power, resulting in no response from remote control or manual operation of the air conditioner.
2. Abnormal or Fluctuating Output Voltage
Partial discharge or coil deformation inside the transformer can lead to abnormal primary resistance and unstable output voltage, resulting in intermittent failure of the cooling/heating function.
3. Overheating and Burn Marks
Prolonged high-load operation or poor heat dissipation can cause the transformer temperature to rise, the insulation material to age, and even show signs of charring or burning, accompanied by abnormal noise or odor.
4. Increased Noise or Electromagnetic Interference
Loose coils or damaged magnetic core structure can produce abnormal humming sounds and generate electromagnetic interference to the air conditioner control circuit, affecting the normal operation of the refrigeration system.

How to determine if an air conditioner's lack of cooling is due to a problem with the Air Conditioner Transformer?

1. Inspect the power transformer's appearance.
Visually inspect for burns, discoloration, or scorch marks. If the transformer is burnt out, it's highly likely the root cause of the cooling failure.
2. Measure the primary and secondary resistance.
Use a multimeter to measure the primary resistance of the transformer. If it's infinite or significantly low, the coil is open-circuited or short-circuited, resulting in insufficient power supply and preventing the air conditioner from starting its cooling function.
3. Observe the starting current and power changes.
Under normal circumstances, the air conditioner's starting current should be within the rated range. If the starting current is abnormally low or the power drops suddenly, it's often due to insufficient transformer output power.
4. Troubleshoot other common faults.
Before confirming a transformer malfunction, check for refrigerant leaks, whether the compressor is functioning properly, and whether the filter is clogged. If these components are all normal, but the air conditioner still doesn't cool, the likelihood of a transformer malfunction increases significantly.