Acson AC Error Codes and Troubleshooting

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Acson AC Error Codes and Troubleshooting

Acson AC Error Codes and Troubleshooting Guide

Is your Acson air conditioner showing an error code like E1, E5, F3, H6, U4 and not cooling properly?

Don’t worry.

This complete Acson AC Error Codes and Troubleshooting Guide explains:

  • Full error code list

  • Meaning of each code

  • Possible causes

  • Step-by-step troubleshooting

  • Difficulty level (DIY or technician required)

  • Estimated repair cost

Acson is a well-known air conditioning brand popular in residential and commercial HVAC applications. Like most modern AC systems, Acson units display error codes to help diagnose problems quickly.

Let’s decode them clearly.

How to Check Acson AC Error Code

Before troubleshooting, confirm the error code.

Method 1: Display Panel

Most Acson split AC models show the error directly on the indoor LED display.

Method 2: Remote Control Diagnosis

  1. Turn ON the AC.

  2. Press and hold the diagnostic button (if available).

  3. Note the displayed code.

Write down the code before turning off the unit.

Most Common Acson AC Error Codes (Complete List)

Below are the most common error codes found in Acson split and inverter AC units.

 E1 – Indoor Temperature Sensor Fault

Meaning:

Room temperature sensor malfunction.

Causes:

  • Loose thermistor connection

  • Sensor damage

  • PCB reading error

Step-by-Step Troubleshooting:

  1. Turn OFF AC from main supply.

  2. Restart after 5 minutes.

  3. If error persists, sensor needs inspection.

Difficulty Level:

 Medium – Technician recommended.

 E2 – Indoor Coil Sensor Error

Meaning:

Evaporator temperature sensor fault.

Causes:

  • Sensor failure

  • Moisture damage

  • PCB fault

Solution:

  1. Reset system.

  2. Check if cooling resumes.

  3. Replace faulty thermistor if needed.

Difficulty Level:

 Medium to High.

 E3 – Fan Motor Speed Abnormal

Meaning:

Indoor fan motor problem.

Causes:

  • Fan motor damage

  • Wiring issue

  • Dust blockage

Step-by-Step Solution:

  1. Check for airflow blockage.

  2. Clean air filters.

  3. If fan not spinning properly, technician required.

Difficulty Level:

 Medium.

 E4 – High Discharge Temperature

Meaning:

Compressor overheating.

Causes:

  • Dirty condenser coil

  • Gas imbalance

  • Poor ventilation

Solution:

  1. Clean outdoor unit.

  2. Ensure proper airflow around condenser.

  3. Technician should check gas pressure.

Difficulty Level:

 Medium to High.

E5 – Overcurrent Protection

Meaning:

Compressor drawing excessive current.

Causes:

  • Voltage fluctuation

  • Compressor issue

  • PCB malfunction

Solution:

  1. Switch off AC immediately.

  2. Avoid repeated restart attempts.

  3. Call authorized technician.

Difficulty Level:

 High – Professional service required.

 F1 – Outdoor Temperature Sensor Fault

Meaning:

Outdoor thermistor malfunction.

Causes:

  • Sensor damage

  • Wiring issue

Solution:

Sensor testing and replacement.

Difficulty Level:

High.

 F3 – Refrigerant Shortage

Meaning:

Low gas pressure detected.

Causes:

  • Refrigerant leakage

  • Improper installation

  • Pipe joint crack

Step-by-Step Solution:

  1. Turn off AC.

  2. Check copper pipe joints for oil stains.

  3. Technician must perform leak test.

  4. Repair leak and refill gas.

Difficulty Level:

 High.

 H6 – Compressor Lock Protection

Meaning:

Compressor unable to start.

Causes:

  • Compressor fault

  • PCB issue

  • Power fluctuation

Solution:

  1. Switch off power supply.

  2. Wait 10 minutes.

  3. If error returns, compressor inspection required.

Difficulty Level:

 Very High.

 U4 – Communication Error

Meaning:

Indoor & outdoor communication failure.

Causes:

  • Loose wiring

  • Damaged cable

  • PCB fault

Solution:

  1. Turn off AC.

  2. Restart after 5 minutes.

  3. Technician should check communication wire.

Difficulty Level:

 High.

Quick Reference Table – Acson Error Codes

Error Code Meaning Main Cause Difficulty
E1 Indoor sensor fault Thermistor issue Medium
E2 Coil sensor error Sensor damage Medium
E3 Fan motor issue Wiring problem Medium
E4 High temp Dirty condenser Medium
E5 Overcurrent Compressor fault High
F3 Gas shortage Leakage High
H6 Compressor lock Motor issue Very High
U4 Communication Wiring/PCB High

Minor vs Major Acson AC Error Codes

Minor (DIY Possible)

  • E1

  • E3

  • E4

Often resolved by cleaning filters or resetting system.

Major (Technician Required)

  • E5

  • H6

  • F3

  • U4

These involve compressor, gas, or PCB.

Estimated Repair Cost in India

Issue Approx Cost
Sensor Replacement ₹800 – ₹2000
Gas Refill ₹2000 – ₹4500
Fan Motor Repair ₹3000 – ₹6000
PCB Replacement ₹5000 – ₹12000
Compressor Replacement ₹9000+

Prices vary by model and city.

Common Reasons for Acson AC Errors

  1.  Poor maintenance
  2.  Voltage fluctuation
  3.  Gas leakage
  4.  Dust accumulation
  5.  Water leakage inside unit
  6.  Aging components

Regular servicing reduces errors significantly.

Preventive Maintenance Tips

  •  Clean filters every 30 days
  •  Service AC before summer
  • Install voltage stabilizer
  •  Keep outdoor unit clean
  •  Check drain pipe blockage
  •  Ensure proper installation

Maintenance reduces 70% of common issues.

When Should You Call a Technician Immediately?

Call service center if:

  • Compressor-related error appears

  • Burning smell detected

  • Loud unusual noise

  • AC trips MCB frequently

  • Gas leakage suspected

Never attempt compressor or PCB repair yourself.

Is Acson AC Reliable?

Acson is known for:

  •  Strong cooling
  •  Affordable pricing
  • Reliable residential units

Like all brands, regular maintenance ensures long lifespan.

Frequently Asked Questions (FAQ)

How do I reset Acson AC error?

Turn off main power for 5–10 minutes and restart.

What does F3 mean in Acson AC?

Refrigerant shortage or gas leakage.

Why is my Acson AC showing E5?

Overcurrent protection triggered due to compressor issue.

Can I fix sensor errors myself?

Basic reset possible, but sensor replacement requires technician.

Is gas refill covered under warranty?

Usually not unless manufacturing defect.

Final Summary

Acson AC error codes help detect:

  • Sensor issues

  • Gas leakage

  • Fan problems

  • Compressor faults

  • PCB malfunction

Understanding the meaning and troubleshooting steps helps avoid unnecessary panic and repair costs.

Minor issues → Try cleaning and reset.
Major issues → Contact professional immediately.

Conclusion

Acson AC error codes are built-in diagnostic tools designed to protect your system from serious damage.

Whether it’s E1 sensor fault, F3 gas shortage, or H6 compressor lock, identifying the problem early saves time and money.

Regular servicing, voltage protection, and professional installation ensure your Acson AC runs efficiently for years.

If error persists, always contact authorized service for safe and reliable repair.

Stay informed. Stay cool.

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