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haier | air-conditioner – IPM Fault
Error Codes (undefined): Troubleshooting, Fixes & Prevention Tips explained below.

What Does CH21 Error Mean?❓

The CH21 error means that the Intelligent Power Module (IPM) has detected an abnormal DC voltage peak, indicating a fault in the compressor inverter system. This protects your AC by shutting it down to prevent damage.

air-conditioner - What Causes the CH21 Error?

  • Overcurrent in compressor phases (U, V, W)
  • Poor insulation or short circuit in compressor windings
  • Overload due to refrigerant overcharge or improper piping
  • Faulty inverter PCB or damaged IPM module
  • Loose or damaged wiring connections

air-conditioner - How to Fix CH21 Error❓

  • Power Cycle the AC

    1. Turn off the air conditioner and unplug it from power for at least 5 minutes.
    2. Restart the unit to reset the error.

  • Inspect Compressor

    1. Check for overheating, unusual noises, or visible damage.
    2. If damaged, replace the compressor.

  • Check Inverter PCB and IPM Module

    1. Look for burnt or damaged components on the PCB.
    2. Replace the IPM module if faulty.

  • Verify Refrigerant Levels

    1. Ensure refrigerant charge is within manufacturer specifications.
    2. Avoid overcharging or undercharging.

  • Inspect Wiring Connections

    1. Tighten any loose wires and repair damaged cables.

  • Consult Professional Technician

    1. If the error persists, contact an authorized service technician for advanced diagnostics and repairs.

air-conditioner - Helpful Tips to Prevent CH21 Error

  • Perform regular maintenance and inspection of inverter PCB and compressor.
  • Avoid refrigerant overcharge to prevent overload.
  • Ensure proper wiring and electrical connections.
  • Schedule annual servicing by qualified technicians.
  • Do not attempt repairs on electrical components without proper training.

Frequently Asked Questions About CH21 Error❓

Question: Can I reset the CH21 error by power cycling?
Answer: Yes, sometimes turning off the AC for 5 minutes and restarting can reset the error temporarily.
Question: Is CH21 error dangerous to ignore?
Answer: It can cause further damage to the compressor or inverter if ignored, so timely repair is recommended.
Question: Do I need a technician to fix CH21?
Answer: Yes, since it involves electrical components, a qualified technician should handle repairs.

When to Contact a Technician

If you experience any of the following issues even after completing the recommended troubleshooting steps, please contact an authorized service technician or our support team for further assistance.

  • The same error appears repeatedly after restarting or resetting the unit.
  • Multiple error codes appear simultaneously.
  • The device makes unusual noises, vibrations, or emits a burning smell.
  • The product fails to start, operate, or complete its function despite troubleshooting.
  • There are signs of electrical issues, physical damage, or leakage.
  • An unknown or unlisted error code appears on the display.

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