Fujitsu AC Error Codes Causes and Solutions
Fujitsu AC Error Codes – Causes and Solutions
Seeing codes like E1, E2, F3, H6, U4, or A1 on your indoor display can be confusing but don’t worry.
This fully Fujitsu AC Error Codes – Causes and Solutions (2026 Edition) guide explains:
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Complete Fujitsu AC error code list
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Meaning of each code
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Common causes
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Step-by-step troubleshooting solutions
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DIY vs technician repair level
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Estimated repair costs (India & global average)
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Preventive maintenance tips
Fujitsu General is a globally respected HVAC brand known for premium inverter split and ducted air conditioning systems. Fujitsu AC units include advanced self-diagnosis technology, which displays error codes to protect key components from serious damage.
Understanding these codes early can prevent expensive compressor or PCB failures.
How Fujitsu AC Self-Diagnosis System Works
Modern Fujitsu air conditioners use intelligent control boards (PCB) that constantly monitor:
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Room temperature
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Evaporator coil temperature
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Outdoor unit operation
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Compressor current
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Refrigerant pressure
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Communication signals
When the system detects abnormal operation, it:
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Displays an error code
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Stops compressor (if required)
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Enters protection mode
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Prevents further damage
This protects:
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Compressor
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Sensors
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Fan motor
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PCB
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Refrigerant system
How to Check Fujitsu AC Error Codes
Before troubleshooting, confirm the exact code.
Method 1: Indoor Unit LED Display
Most Fujitsu split AC models show the code directly on the display.
Method 2: Wired Wall Controller
Ducted models display faults under the “Error” or “Service” section.
Method 3: Flashing Indicator Lights
Older models show blinking light combinations. Refer to your manual.
Always write down the exact code before turning off the system.
Complete Fujitsu AC Error Codes List
Below are the most common Fujitsu split and inverter AC error codes.
E1 – Indoor Temperature Sensor Fault
Meaning:
Room temperature thermistor malfunction.
Common Causes:
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Loose wiring
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Sensor failure
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PCB reading issue
Step-by-Step Solution:
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Turn off main power supply.
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Wait 5–10 minutes.
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Restart AC.
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If error persists, sensor inspection required.
Difficulty Level: Medium
Estimated Cost: ₹1000 – ₹2500
E2 – Indoor Coil Sensor Error
Meaning:
Evaporator temperature sensor failure.
Causes:
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Moisture damage
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Wiring disconnection
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Thermistor burnout
Solution:
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Reset AC.
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Replace faulty coil sensor if required.
Difficulty: Medium to High
Cost: ₹1500 – ₹3000
E3 – Indoor Fan Motor Fault
Meaning:
Fan motor abnormal operation.
Causes:
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Dust accumulation
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Motor capacitor issue
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Wiring damage
Fix:
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Clean air filters.
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Check airflow blockage.
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If noise persists, technician required.
Difficulty: Medium
Cost: ₹3000 – ₹7000
E4 – High Discharge Temperature
Meaning:
Compressor overheating.
Causes:
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Dirty condenser coil
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Refrigerant imbalance
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Poor ventilation
Solution:
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Clean outdoor unit.
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Ensure airflow clearance.
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Technician should check refrigerant pressure.
Difficulty: Medium to High
Cost: ₹2000 – ₹5000
E5 – Overcurrent Protection
Meaning:
Compressor drawing excessive current.
Causes:
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Voltage fluctuation
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Compressor issue
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PCB malfunction
What to Do:
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Switch off AC immediately.
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Avoid repeated restart attempts.
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Call authorized service.
Difficulty: High
Cost: ₹6000 – ₹15000
F3 – Refrigerant Shortage (Low Gas Pressure)
Meaning:
Low refrigerant detected.
Causes:
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Gas leakage
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Loose flare joints
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Copper pipe crack
Step-by-Step Solution:
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Turn off AC.
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Inspect copper pipes for oil stains.
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Technician performs leak test.
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Repair leak and refill refrigerant.
Difficulty: High
Cost: ₹2500 – ₹6000
H6 – Compressor Lock Protection
Meaning:
Compressor unable to start.
Causes:
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Compressor seizure
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Power surge
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PCB issue
Solution:
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Switch off power supply.
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Wait 10 minutes.
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If persistent, compressor inspection required.
Difficulty: Very High
Cost: ₹10000+
U4 – Indoor & Outdoor Communication Error
Meaning:
Communication failure between units.
Causes:
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Loose communication wire
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Damaged cable
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PCB fault
Solution:
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Restart system.
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Technician should inspect wiring and board.
Difficulty: High
Cost: ₹4000 – ₹9000
A1 – Indoor PCB Fault
Meaning:
Control board malfunction.
Causes:
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Voltage surge
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Component burnout
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Moisture damage
Solution:
PCB testing and replacement required.
Difficulty: Very High
Cost: ₹5000 – ₹12000
Quick Reference Table – Fujitsu AC Error Codes
| Error Code | Meaning | Main Cause | Difficulty |
|---|---|---|---|
| E1 | Room sensor fault | Thermistor | Medium |
| E2 | Coil sensor error | Sensor issue | Medium |
| E3 | Fan motor fault | Motor failure | 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 |
| A1 | PCB fault | Control board | Very High |
Minor vs Major Fujitsu AC Errors
Minor (DIY Possible)
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E1
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E3
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E4
Often fixed by cleaning filters and resetting power.
Major (Technician Required)
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E5
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F3
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H6
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U4
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A1
These involve compressor, refrigerant, or PCB components.
Estimated Fujitsu AC Repair Cost
| Issue | Approx Cost |
|---|---|
| Sensor Replacement | ₹1000 – ₹3000 |
| Gas Refill | ₹2500 – ₹6000 |
| Fan Motor Repair | ₹3000 – ₹7000 |
| PCB Replacement | ₹5000 – ₹12000 |
| Compressor Replacement | ₹10000+ |
Costs vary by model and city.
Why Fujitsu AC Shows Error Codes
Common causes include:
- Poor maintenance
- Refrigerant leakage
- Voltage fluctuation
- Dust buildup
- Drain blockage
- Aging components
Regular servicing prevents major failures.
Preventive Maintenance Tips
- Clean filters every 30 days
- Service before summer
- Install surge protector
- Keep outdoor unit clean
- Check drain line
- Ensure professional installation
Preventive care extends system life significantly.
When to Call a Technician Immediately
Call authorized service if:
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Compressor-related error appears
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AC trips breaker frequently
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Burning smell detected
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Loud abnormal noise
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Refrigerant leak suspected
Never attempt PCB or compressor repair yourself.
Is Fujitsu AC Reliable?
Fujitsu General air conditioners are known for:
- Premium inverter technology
- Excellent energy efficiency
- Durable compressors
- Quiet operation
With proper maintenance, Fujitsu systems can last 12–15+ years.
Frequently Asked Questions (FAQ)
How do I reset my Fujitsu AC?
Turn off the main power supply for 5–10 minutes and restart.
What does F3 mean in Fujitsu AC?
F3 indicates refrigerant shortage or gas leakage.
Why is my Fujitsu AC showing E5?
E5 means overcurrent protection due to compressor or electrical issue.
Can I fix Fujitsu sensor errors myself?
You can try resetting, but sensor replacement requires technician tools.
Is refrigerant refill covered under warranty?
Usually not unless it’s a manufacturing defect.
Final Summary
Fujitsu AC error codes are intelligent protection alerts designed to safeguard:
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Compressor
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Sensors
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Fan motor
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PCB
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Refrigerant system
Understanding these codes helps you:
- Prevent major breakdown
- Reduce repair cost
- Extend AC lifespan
- Diagnose issues early
Minor issues : Clean and reset.
Major issues : Contact professional immediately.
Conclusion
Fujitsu AC error codes are built-in safety systems that protect your air conditioner from severe damage.
Whether it’s E1 sensor fault, F3 refrigerant shortage, or H6 compressor lock, early diagnosis saves money and prevents system failure.
With regular maintenance, voltage protection, and proper installation, your Fujitsu AC can deliver reliable cooling for many years.
If error persists after reset, always contact authorized service for safe and professional repair.
Stay informed. Stay cool.