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IFB AC Error Code List | Repair Skills

By Amarjeet Kumawat 

0

IFB air conditioners are reliable appliances, but encountering error codes is not uncommon. This guide will walk you through the troubleshooting steps for some common IFB AC error codes, ensuring you can address issues promptly and effectively.

FAILURE TYPE	ERROR CODE	RECOVERY
IDU PCB communication failure	EO - CI	Auto
ODU PCB communication failure	EO - CO	Auto
Indoor room temperature sensor failure ( IRT )	E1	Auto
Indoor coil temperature sensor failure ( IPT )	E2	Auto
Outdoor coil temperature sensor failure ( OPT )	E3	Auto
AC Cooling system abnormal	E4	Power ON / OFF
IDU PG fan motor / DC fan motor works abnormal / failure	E6	Power ON / OFF
Outdoor ambient temperature sensor failure	E7	Auto
ODU discharge temperature sensor failure	E8	Auto
IPM / Compressor driving control abnormal	E9	Power ON / OFF
ODU DC fan motor failure	EF	Power ON / OFF
Abnormal Input voltage variation at time of compressor ON	EU	Power ON / OFF
ODU inrush current bypass relay failure	FO	Power ON / OFF
Compressor Rotor block	F1	Power ON / OFF
Vac abnormal ( Vac > 325 or Vac < 125 for 5 min	F4	Power ON / OFF
PFC protection	F5	Auto
a. Compressor Lack of phase b . Flux out of range	F6	Power ON / OFF
IPM module temperature protection	F7	Auto

IFB AC Protection Error Code

PROTECTION TYPE	PROTECTION CODE
IPM module protection	PO
Over and under voltage protection	P1
Over current protection	P2
ODU discharge over temperature protection	P4
IDU coil low temperature protection	P5
ODU coil over temperature protection in cool mode	P6
ODU ambient over & under temperature protection	P8
Compressor driving protection ( Load abnormal )	P9

IDU PCB Communication Failure (EO - CI)

Error Code: EO - CI

Recovery: Automatic

Solution:

1. Communication Analysis: Conduct a thorough analysis of IDU PCB communication.
2. Obstruction Check: Examine for any physical obstructions affecting communication.
3. Diagnostic Tools: Utilize diagnostic tools to pinpoint communication issues.
4. Manual Reference: Refer to the technical manual for further diagnosis and resolution.

ODU PCB Communication Failure (EO - CO)

Error Code: EO - CO

Recovery: Automatic

Solution:

1. Communication Protocol: Review ODU PCB communication protocol.
2. Signal Testing: Conduct signal testing to identify communication irregularities.
3. Technical Documentation: Consult technical documentation for precise communication troubleshooting steps.
4. Advanced Tools: Use advanced diagnostic tools to assess communication health.

Indoor Room Temperature Sensor Failure (IRT)

Error Code: E1

Recovery: Automatic

Solution:

1. Wait for Recovery: In most cases, the system will automatically recover.
2. Ensure Proper Airflow: Check and ensure there's proper airflow around the indoor unit.
3. Check for Blockages: Inspect for any blockages affecting the temperature sensor.

Indoor Coil Temperature Sensor Failure (IPT)

Error Code: E2

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to recover automatically.
2. Ensure Airflow: Confirm there are no obstructions around the indoor coil.
3. Check Sensor: Inspect the temperature sensor for any issues.

Outdoor Coil Temperature Sensor Failure (OPT)

Error Code: E3

Recovery: Automatic

Solution:

1. Automatic Recovery: Wait for the system to recover on its own.
2. Check for Obstructions: Examine the outdoor unit for any obstacles.

AC Cooling System Abnormal (E4)

Error Code: E4

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Check for Refrigerant Issues: Inspect the refrigerant levels and address any abnormalities.

IDU PG Fan Motor / DC Fan Motor Works Abnormal (E6)

Error Code: E6

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait briefly, and then turn it back on.
2. Fan Motor Inspection: Inspect the indoor fan motor and DC fan motor for any abnormalities.

Outdoor Ambient Temperature Sensor Failure (E7)

Error Code: E7

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to recover automatically.
2. Obstacle Check: Ensure there are no obstacles affecting the ambient temperature sensor.

ODU Discharge Temperature Sensor Failure (E8)

Error Code: E8

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the AC to recover on its own.
2. Check for Blockages: Inspect for any blockages around the outdoor unit.

IPM / Compressor Driving Control Abnormal (E9)

Error Code: E9

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Check Electrical Connections: Inspect electrical connections for any loose or damaged components.
3. Professional Assistance: If the problem persists, consult with a professional HVAC technician for advanced diagnostics.

ODU DC Fan Motor Failure (EF)

Error Code: EF

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Fan Motor Inspection: Inspect the ODU DC fan motor for failures or abnormalities.
3. Advanced Troubleshooting: Use advanced troubleshooting techniques for a detailed analysis.

Abnormal Input Voltage Variation at Time of Compressor ON (EU)

Error Code: EU

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Voltage Analysis: Analyze input voltage variations during compressor ON cycles.
3. Technical Assessment: Perform a technical assessment of voltage fluctuations.

ODU Inrush Current Bypass Relay Failure (FO)

Error Code: FO

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Relay Inspection: Inspect the inrush current bypass relay for failures.
3. Advanced Troubleshooting: Use advanced troubleshooting techniques for relay analysis.
4. Technical Consultation: Consult with technical experts for precise guidance.

Compressor Rotor Block (F1)

Error Code: F1

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Rotor Block Analysis: Analyze the compressor rotor for blockages.
3. Technical Inspection: Inspect the compressor rotor for abnormalities.
4. Technical Support: If issues persist, seek support from technical experts.

Vac Abnormal (Vac {'>'} 325 or Vac {'<'} 125 for 5 min) (F4)

Error Code: F4

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Voltage Check: Confirm that the voltage is within the acceptable range.

PFC Protection (F5)

Error Code: F5

Recovery: Automatic

Solution:

1. Wait for Automatic Recovery: Allow the AC to recover automatically.
2. Check Power Supply: Ensure stable power supply to the AC unit.
3. Professional Assistance: If the error persists, consult with a service technician for advanced diagnostics.

Compressor Lack of Phase / Flux Out of Range (F6)

Error Code: F6

Recovery: Power ON / OFF

Solution:

1. Power Cycle: Turn off the AC, wait for a few minutes, and then power it back on.
2. Check Electrical Phases: Verify the electrical phases for the compressor.

IPM Module Temperature Protection (F7)

Error Code: F7

Recovery: Automatic

Solution:

1. Wait for Automatic Recovery: Allow the AC to recover automatically.
2. Temperature Check: Ensure the ambient temperature around the IPM module is within the specified range.

---

IPM Module Protection (PO)

Error Code: PO

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the AC to recover automatically.
2. Module Inspection: Conduct a detailed inspection of the IPM module for visible damage or anomalies.
3. Advanced Analysis: Use specialized diagnostic tools for in-depth analysis of the module's performance.
4. Technical Assistance: Collaborate with technical experts for precise guidance in resolving the issue.

Over and Under Voltage Protection (P1)

Error Code: P1

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to stabilize and recover automatically.
2. Voltage Check: Utilize specialized equipment to confirm that the power supply voltage is within the acceptable range.
3. Power Supply Inspection: Conduct a comprehensive inspection of the power supply to ensure stability.
4. Advanced Troubleshooting: Employ advanced troubleshooting techniques for a detailed analysis of voltage variations.

{/* Over Current Protection (P2) */}

Over Current Protection (P2)

Error Code: P2

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to recover on its own.
2. Current Analysis: Utilize specialized tools to check for any abnormal current flow within the system.
3. Professional Assistance: Collaborate with fellow technicians or specialists for advanced diagnostics.
4. Documentation Reference: Refer to technical documentation for precise steps in resolving overcurrent issues.

{/* ODU Discharge Over Temperature Protection (P4) */}

ODU Discharge Over Temperature Protection (P4)

Error Code: P4

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the AC to cool down and recover automatically.
2. Temperature Analysis: Utilize temperature sensors and gauges to check for abnormal heat in the outdoor unit.
3. Airflow Inspection: Ensure proper airflow around the outdoor unit for efficient cooling.
4. Collaboration with Experts: Seek collaboration with experts for a detailed analysis of temperature-related issues.

IDU Coil Low Temperature Protection (P5)

Error Code: P5

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to warm up and recover automatically.
2. Temperature Check: Use specialized tools to ensure the ambient temperature is within the operating range.
3. Collaboration with Colleagues: Collaborate with fellow technicians for insights into resolving low-temperature protection issues.
4. Professional Assistance: Consult with senior technicians or specialists for guidance in complex scenarios.

ODU Coil Over Temperature Protection in Cool Mode (P6)

Error Code: P6

Recovery: Automatic

Solution:

1. Automatic Recovery: Wait for the AC to cool down and recover automatically.
2. Cooling Mode Verification: Confirm that the AC is operating in the correct cooling mode using diagnostic tools.
3. Collaboration with Experts: Seek collaboration with HVAC specialists for a detailed analysis of cooling-related issues.
4. Advanced Troubleshooting: Employ advanced troubleshooting techniques for in-depth resolution.

ODU Ambient Over & Under Temperature Protection (P8)

Error Code: P8

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to stabilize and recover automatically.
2. Temperature Check: Use specialized tools to ensure the outdoor ambient temperature is within the specified range.
3. Collaboration with Technicians: Collaborate with fellow technicians for insights into resolving ambient temperature protection issues.
4. Documentation Reference: Refer to technical documentation for precise steps in addressing ambient temperature variations.

Compressor Driving Protection (Load Abnormal) (P9)

Error Code: P9

Recovery: Automatic

Solution:

1. Automatic Recovery: Allow the system to recover automatically.
2. Load Analysis: Utilize specialized tools to check for abnormal loads on the compressor.
3. Collaboration with Colleagues
4. Collaboration with Colleagues: Work collaboratively with fellow technicians for insights into resolving load-related issues.
5. Advanced Troubleshooting: Employ advanced troubleshooting techniques and tools for an in-depth analysis of compressor load abnormalities.
6. Documentation Reference: Refer to technical documentation for precise steps in addressing load-related protection

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