Error 428 — Compressor operation stop due abnormal compression ratio

¿Qué significa 428 ?

The compressor has stopped operating because the system detected an abnormal compression ratio. This indicates an issue with how the compressor is processing refrigerant, which can lead to system damage.

• Refrigerant overcharge or undercharge
• Blockage in the refrigerant circuit (e.g., expansion valve, filter dryer)
• Compressor malfunction
• Faulty pressure sensors providing incorrect readings

Haga clic en los pasos para seguir su progreso.

1. 1

   Turn off the outdoor unit and wait for a few minutes for the system pressures to equalize.

2. 2

   Perform a power cycle by turning off the unit's circuit breaker for 30 seconds, then restoring power.

3. 3

   Check for any obvious signs of refrigerant leaks (frost, oil residue) around the outdoor unit.

4. 4

   This error requires specialized tools and expertise to diagnose the exact cause of the abnormal compression ratio.

5. 5

   Contact a certified HVAC technician for professional diagnosis and repair.