Complete Guide to Gree AC Error Codes (With Solutions)
When your Gree air conditioner starts flashing error codes, it can be frustrating and confusing. As experienced HVAC technicians with over 15 years in the field, we’ve compiled this comprehensive guide to help you understand and resolve common Gree AC error codes quickly and effectively.
Understanding Gree AC Error Code Systems
Gree air conditioners use sophisticated diagnostic systems to communicate problems through LED flash patterns and display codes. Different models including Bora 28K, Bora 9/24K, Lomo Inverter, U-Match Fixed Speed, and U-Match Inverter systems each have their unique error reporting methods.
How to Read Gree AC Error Codes
Most Gree units display error codes through:
- LED Flash Patterns: The indoor unit’s LED flashes a specific number of times
- Digital Display: Direct error code display on the unit’s screen
- Remote Control Display: Error codes shown on your AC remote.
The pattern typically involves 3 seconds OFF followed by the specific number of flashes corresponding to the error code.
Critical Error Codes Requiring Immediate Attention
E1 - High Pressure Protection
| Detail | Description |
|---|---|
| What it means | The system’s refrigerant pressure has exceeded safe operating limits. |
| Common causes | Dirty outdoor condenser coils, Blocked airflow, Overcharged refrigerant, Faulty pressure sensor |
| DIY Solutions | Clean outdoor unit, Ensure 2–3 feet clearance, Clean air filters, Open all vents |
| When to call professionals | If cleaning doesn’t resolve, refrigerant system diagnosis or sensor replacement is required. |
E2 - Anti-Freeze Protection
| Detail | Description |
|---|---|
| What it means | System detected potential freezing conditions in indoor coil. |
| Common causes | Dirty air filters, Low refrigerant, Blocked airflow, Faulty indoor temperature sensor |
| DIY Solutions | Replace/clean filters, Open all vents, Unblock return air grilles, Let system defrost 2–3 hrs |
| Professional diagnosis needed | Likely refrigerant leaks or sensor issues. |
E4 - Compressor Discharge Temperature Protection
| Detail | Description |
|---|---|
| What it means | Compressor running too hot, triggering safety protection. |
| Common causes | Low refrigerant, Dirty condenser coils, Faulty compressor, Restricted refrigerant flow |
| Immediate actions | Turn off unit, Check outdoor debris, Clean condenser coils, Restart after 30 min |
| Expert intervention required | Often serious issues → refrigerant diagnosis needed. |
Sensor-Related Error Codes (F Series)
F1 - Indoor Ambient Sensor Issues
| Symptoms | Incorrect readings, poor cooling/heating |
|---|---|
| Quick fix | Check loose connections |
| Professional solution | Sensor replacement & calibration |
F2 - Indoor Coil Sensor Problems
| Symptoms | Inconsistent operation, frequent cycling |
|---|---|
| Check | Ensure sensor isn’t damaged/iced |
| Resolution | Usually needs replacement |
F3 - Outdoor Ambient Sensor Malfunction
| Impact | Poor efficiency in extreme weather |
|---|---|
| Basic check | Inspect sensor for damage/corrosion |
| Fix | Replacement & recalibration |
F4 - Outdoor Coil Sensor Error
| Signs | Inadequate defrost, reduced efficiency |
|---|---|
| Action | Check wiring for damage |
| Solution | Sensor replacement |
F5 - Compressor Discharge Sensor Fault
| Critical nature | Affects compressor protection |
|---|---|
| Safety concern | Never bypass this sensor |
| Resolution | Immediate professional service |
System Protection Codes (H,U,E Series)
| Symptoms | Description |
|---|---|
| H1 – Defrosting Mode | System pauses cooling/heating temporarily; coil frost; resumes automatically after defrost. |
| H3 – Compressor Overload Protection | AC shuts down suddenly, trips frequently, poor cooling/heating; caused by poor ventilation or compressor stress. |
| H6 – Indoor Fan Motor Malfunction | No airflow, weak airflow, or strange noises; results in poor cooling/heating, incorrect room temperature readings. |
| P5 – Compressor Over Current Protection | Sudden shutdown, breaker trips, buzzing sound; poor cooling due to electrical overload. |
| PH – High DC Voltage / PL – Low DC Voltage | AC won’t start or shuts down unexpectedly; incorrect display readings, unstable cooling/heating. |
| U7 – Reversing Valve Malfunction | AC stuck in cooling or heating mode only; room fails to reach desired temperature. |
| E6 – Indoor/Outdoor Communication Error | AC unresponsive, shows error code, fails to start; incorrect temperature readings, no cooling/heating. |
Free Tips to Prevent Gree Error Codes
Monthly Maintenance
- Clean or replace air filters
- Check for blocked vents and grilles
- Inspect outdoor unit for debris
- Verify thermostat settings
Seasonal Maintenance
- Professional coil cleaning
- Refrigerant level inspection
- Electrical connection tightening
- Sensor calibration check
Annual Professional Service
- Complete system inspection
- Preventive maintenance program
- Performance optimization
- Safety system verification
When DIY Solutions Don't Work
If you’ve tried the basic troubleshooting steps and error codes persist, it’s time for professional intervention. Continuing to operate a malfunctioning AC can lead to:
- Compressor damage
- Electrical system failure
- Increased energy costs
- Complete system breakdown
- Safety hazards
Get Our Professional Gree AC Repair Services
At Maqsood and Sons Islamabad, we specialize in comprehensive Gree AC repair and maintenance services. Our certified technicians have extensive experience with all Gree models and error codes.
Our Services Include:
- Emergency Repair Services: Available 24/7 for critical breakdowns
- Preventive Maintenance Programs: Keep your system running efficiently
- Refrigerant System Diagnosis: Professional leak detection and repair
- Electrical System Repair: Safe handling of all electrical components
- Sensor Replacement and Calibration: Precision temperature control restoration
- Compressor Repair and Replacement: Expert handling of major components
Why Choose Our Professional Services:
- Certified Technicians: Factory-trained on Gree systems
- Genuine Parts: Only authentic Gree replacement components
- Warranty Protection: All repairs backed by comprehensive warranties
- Rapid Response: Same-day service available in Islamabad area
- Transparent Pricing: No hidden fees, upfront cost estimates
Get Our Professional Gree AC Repair Services
For professional technicians working on Gree systems, understanding proper refrigerant pressures is crucial. Different refrigerant types (R22, R134a, R410A) have specific pressure requirements at various temperatures. Always refer to manufacturer specifications and use proper gauges for accurate diagnosis.
Understanding Gree AC error codes empowers you to perform basic troubleshooting and know when professional help is needed. While some issues can be resolved with simple maintenance, many error codes indicate complex problems requiring expert diagnosis and repair.
Remember, safety should always be your priority. When in doubt, especially with electrical or refrigerant-related errors, contact qualified professionals. Regular maintenance and prompt attention to error codes will keep your Gree AC system running efficiently for years to come.
Don’t let AC problems disrupt your comfort. Contact Maqsood and Sons today for reliable, professional Gree AC repair services in Islamabad.