Hisense AC Error Codes & Troubleshooting Guide [Finder]

Complete Hisense AC error codes guide & Error Code Finder Tool. Full list, causes, and step-by-step fixes to get your AC cooling again quickly.

Your Hisense AC just flashed a code, and the display or blinking LED won’t stop. Hisense AC error codes appear when the indoor or outdoor control board detects a fault somewhere in the system. These codes vary slightly by model but follow two consistent patterns: numeric codes and E-series codes.

This guide gives you a quick lookup table for instant answers. You’ll also find detailed causes and fixes for each code. Finally, we’ll help you decide when a DIY fix is safe and when it’s time to call a technician.

Hisense AC Error Codes – Standard/Numeric Models

Error Code	What It Means	Quick Fix
Code 1 / F1 / E1	Outdoor coil sensor fault	Check sensor wiring; replace sensor if faulty
Code 2	Outdoor temperature sensor fault	Check wiring and resistance; replace if faulty
Code 3	Outdoor discharge pipe sensor fault	Inspect sensor wiring; replace if damaged
Code 4	Outdoor suction sensor fault	Check wiring continuity; replace sensor if needed
Code 5 / F5	Outdoor PCB or compressor fault	Check compressor wiring; inspect outdoor PCB
Code 6	Abnormal supply voltage	Measure voltage; install stabilizer if fluctuating
Code 8	Compressor overcurrent or overload	Check incoming voltage; inspect compressor operation
Code 9	Overvoltage or undervoltage protection	Verify line voltage; use stabilizer if needed
Code 11	Outdoor PCB fault	Inspect PCB components; repair or replace board
Code 13	Compressor discharge sensor fault	Check sensor mounting and wiring; clean condenser
Code 14	Outdoor pipe sensor fault	Inspect for moisture or dirt; replace sensor
Code 15	Compressor overheat protection	Check overload protector; clean blocked condenser
Code 15 (alt. model)	Indoor evaporator pipe sensor fault	Check sensor resistance; replace if defective
Code 17	Outdoor inverter module fault	Inspect heat sink and thermal paste; test module
Code 18	Inverter compressor fault	Check compressor wiring; test windings
Code 19	Outdoor PCB/IPM protection fault	Check heat sink compound; inspect inverter board
Code 20	Outdoor fan motor fault	Check fan blade for blockage; test motor wiring
Code 21	Refrigerant system fault	Check refrigerant charge; inspect for leaks
Code 34	Indoor coil sensor fault	Check wiring; ensure sensor is securely installed
Code 35	Wired remote communication fault	Check communication cable and terminals
Code 36	Indoor/outdoor communication fault	Check interconnecting wires and both PCBs
Code 37	Indoor drain pump fault	Check pump wiring; verify pump operation
Code 38	Indoor EEPROM memory fault	Check PCB connections; reprogram or replace PCB

Common E-Series Codes (Other Hisense Models)

Error Code	What It Means	Quick Fix
E1 / F1	Temperature or sensor fault	Check sensor wiring; replace if defective
E2	Indoor temperature sensor fault	Check wiring and resistance; replace sensor
E3	Indoor-outdoor communication error	Check communication wires between units
E4	Outdoor temperature sensor fault	Inspect sensor wiring; replace if faulty
E5	Room temperature sensor fault	Check sensor placement and wiring
E6	Indoor unit and control panel fault	Check communication cable and connections
E7	Indoor fan motor fault	Check fan wiring; test motor resistance
E8	High-pressure or refrigerant protection	Check refrigerant charge; inspect for leaks

Before You Start Troubleshooting: 5 Basic Checks

1. Power cycle the unit. Turn the AC off and disconnect power for 3–5 minutes, then restart it. This clears many temporary faults on its own.
2. Check the power supply. Verify the voltage is stable and within the correct range for your unit.
3. Clean the air filters. Dirty filters restrict airflow and can trigger sensor-related error codes.
4. Inspect wiring and connectors. Look for loose, damaged, or disconnected terminals on any PCB plugs.
5. Check all sensors. Confirm each sensor is securely attached and free of dirt, moisture, or corrosion.

These steps come from professional troubleshooting practices followed by Urban Service Plaza’s technicians in Kolkata.

If the fault code returns after these checks, move to the specific code section below.

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Hisense Numeric Error Codes (Code 1–38) Explained in Detail

Code 1 / F1 / E1 – Outdoor Coil Temperature Sensor Fault

What it means: This code indicates a faulty or disconnected outdoor coil temperature sensor.

Possible Causes:

• Damaged or corroded sensor wiring
• Loose connector
• Defective sensor itself 

What to Do:

• Check the sensor resistance
• Inspect wiring for cuts, shorts, or corrosion
• Ensure the sensor is firmly mounted
• If the sensor tests fine, have a technician inspect the outdoor PCB

Code 2 – Outdoor Temperature Sensor Fault

What it means: The outdoor ambient temperature sensor has failed. 

Possible Causes:

• Loose or damaged wiring
• Faulty sensor
• Corroded connector 

What to Do:

• Check wiring and connector
• Measure sensor resistance
• Replace the sensor if faulty
• Have the outdoor PCB inspected if the sensor tests normal

Code 3 – Outdoor Discharge Pipe Temperature Sensor Fault

What it means: The compressor discharge temperature sensor is malfunctioning. 

Possible Causes:

• Damaged or shorted wiring
• Poor sensor installation
• Faulty sensor 

What to Do:

• Check sensor installation and wiring
• Inspect for damaged or shorted wires
• Replace the sensor if necessary
• Check the outdoor PCB if the problem remains (technician recommended)

Code 4 – Outdoor Suction Temperature Sensor Fault

What it means: The suction pipe temperature sensor is showing an error. 

Possible Causes:

• Sensor placement issue
• Broken wiring continuity
• Faulty sensor 

What to Do:

• Verify proper sensor placement
• Check wiring continuity
• Replace the sensor if defective
• Inspect the outdoor PCB if needed

Code 5 / F5 – Outdoor PCB or Compressor Fault

What it means: This points to a possible outdoor inverter PCB failure or compressor issue. 

Possible Causes:

• Damaged heat sink or thermal paste
• Faulty compressor terminals or wiring
• Failed compressor windings 

What to Do:

• Check heat sink screws and thermal paste
• Inspect compressor terminals and wiring
• Test compressor windings
• Repair or replace the outdoor PCB if faulty This involves compressor and PCB testing, which is best left to a technician.

Code 6 – Abnormal Supply Voltage

What it means: Input voltage is too high or too low for safe operation. 

Possible Causes:

• Unstable power supply
• Voltage fluctuations
• Damaged PCBs from prior surges 

What to Do:

• Measure supply voltage
• Install a voltage stabilizer if voltage fluctuates
• Inspect indoor and outdoor PCBs if voltage is normal

Code 8 – Compressor Overcurrent / Overload

What it means: The compressor is drawing excessive current. 

Possible Causes:

• High incoming voltage
• Compressor malfunction
• Inverter damage on outdoor PCB 

What to Do:

• Check incoming voltage
• Inspect compressor operation
• Examine outdoor PCB for inverter damage Compressor and PCB checks carry electrical risk; call a technician.

Code 9 – Overvoltage / Undervoltage Protection

What it means: Power supply is outside safe operating limits. 

Possible Causes:

• Unstable grid voltage
• Faulty stabilizer
• Outdoor PCB damage 

What to Do:

• Verify line voltage
• Use a stabilizer if required
• Inspect outdoor PCB if voltage is normal but the error continues

Code 11 – Outdoor PCB Fault

What it means: The outdoor control board has malfunctioned. 

Possible Causes:

• Faulty capacitors
• Damaged inverter circuit
• General PCB wear 

What to Do:

• Check PCB components and capacitors
• Inspect the inverter circuit
• Repair or replace the outdoor PCB This is a technician-level electrical repair.

Code 14 – Outdoor Yellow Pipe Sensor Fault

What it means: The outdoor pipe temperature sensor is malfunctioning. 

Possible Causes:

• Moisture or dirt on the sensor
• Poor sensor contact
• Damaged wiring 

What to Do:

• Inspect for moisture, dirt, or poor contact
• Check wiring and connector
• Replace the sensor if defective
• Inspect the outdoor PCB if needed

Let me flag something before continuing: your list included Code 13 and Code 15 in the sequence, but I skipped ahead to Code 14 above. Let me correct the order and continue properly from Code 13.Confirmed the source data. Continuing correctly from Code 13:

Code 13 – Compressor Discharge Temperature Sensor Fault

What it means: The compressor discharge temperature sensor is not reading correctly. 

Possible Causes:

• Faulty sensor mounting
• Damaged wiring
• Compressor overheating 

What to Do:

• Check sensor mounting and wiring
• Clean the condenser coil and check outdoor fan operation
• Replace the sensor if necessary
• Inspect the outdoor PCB if the sensor is good (technician recommended)

Code 15 – Compressor Overheat Protection

What it means: The compressor is overheating and has triggered a safety shutoff. 

Possible Causes:

• Faulty compressor overload protector
• Blocked condenser airflow
• Outdoor fan not working properly 

What to Do:

• Check the compressor overload protector
• Clean the blocked condenser and verify airflow
• Ensure the outdoor fan runs properly
• Inspect the outdoor PCB if airflow is normal (technician recommended)

Code 15 (Alt. Model) – Indoor Evaporator Pipe Sensor Fault

What it means: On certain Hisense models, Code 15 indicates an indoor evaporator pipe sensor malfunction instead of compressor overheat protection.

Possible Causes:

• Faulty indoor evaporator pipe sensor
• Damaged or loose sensor wiring
• Poor connector contact

What to Do:

• Check sensor resistance
• Inspect wiring and connector
• Replace the sensor if defective
• Check the indoor PCB if necessary (technician recommended)

Code 17 – Outdoor Inverter Module Fault

What it means: The outdoor inverter module or IPM has failed. 

Possible Causes:

• Damaged heat sink
• Degraded thermal paste
• Faulty inverter module 

What to Do:

• Inspect the heat sink and thermal paste
• Test the inverter module
• Repair or replace the outdoor PCB This is an electrical repair best handled by a technician.

Code 18 – Inverter Compressor Fault

What it means: The compressor itself has failed. 

Possible Causes:

• Damaged compressor wiring
• Faulty inverter PCB
• Failed compressor windings 

What to Do:

• Check compressor wiring
• Inspect the inverter PCB
• Test compressor windings
• Replace the compressor if required Compressor replacement should always be done by a professional.

Code 19 – Outdoor PCB/IPM Protection Fault

What it means: The IPM protection circuit has triggered a fault. 

Possible Causes:

• Dried or damaged heat sink compound
• Faulty inverter board
• Overheating components 

What to Do:

• Check the heat sink compound
• Inspect the inverter board
• Repair or replace the outdoor PCB This involves inverter board repair; call a technician.

Code 20 – Outdoor Fan Motor Fault

What it means: The outdoor fan motor isn’t operating correctly. 

Possible Causes:

• Blocked fan blade
• Faulty motor capacitor
• Damaged motor wiring 

What to Do:

• Check the fan blade for blockage
• Test the motor capacitor
• Inspect motor wiring
• Replace the fan motor if faulty

Code 21 – Refrigerant System Fault

What it means: This code points to abnormal refrigerant pressure in the system. 

Possible Causes:

• Low or leaking refrigerant
• Blocked capillary tube or expansion device
• Faulty condenser sensor 

What to Do:

• Check refrigerant charge
• Inspect for leaks
• Examine the capillary tube or expansion device Refrigerant handling requires certified technician tools and training.

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Code 34 – Indoor Coil Temperature Sensor Fault

What it means: The indoor evaporator coil sensor has failed. 

Possible Causes:

• Loose wiring or connector
• Poorly installed sensor
• Faulty sensor 

What to Do:

• Check wiring and connector
• Ensure the sensor is securely installed
• Replace the sensor if faulty
• Inspect the indoor PCB if necessary

Code 35 – Wired Remote Communication Fault

What it means: Communication has failed between the wired controller and indoor unit. 

Possible Causes:

• Damaged communication cable
• Loose terminals
• Faulty connections 

What to Do:

• Check the communication cable
• Inspect terminals for loose or damaged connections
• Repair or replace damaged wiring

Code 36 – Indoor/Outdoor Communication Fault

What it means: Communication has failed between the indoor and outdoor units. 

Possible Causes:

• Damaged interconnecting wires
• Incorrect wiring sequence
• Faulty PCB connectors 

What to Do:

• Check interconnecting communication wires
• Verify correct wiring sequence
• Inspect connectors and both PCBs Rewiring between units should be handled by a technician.

Code 37 – Indoor Drain Pump Fault

What it means: The indoor drain pump has malfunctioned. 

Possible Causes:

• Faulty pump wiring
• Pump not operating
• Damaged PCB connector 

What to Do:

• Check pump wiring
• Verify pump operation
• Inspect the PCB connector
• Replace the drain pump if necessary

Code 38 – Indoor EEPROM Memory Fault

What it means: The indoor EEPROM or memory chip has failed. 

Possible Causes:

• Corrupted memory data
• Weak solder joints
• Faulty PCB 

What to Do:

• Check PCB connections
• Inspect solder joints
• Reprogram or replace the indoor PCB EEPROM reprogramming requires technician-level equipment.

Hisense E-Series Error Codes (General Models) Explained

Certain Hisense models use E-series codes instead of the numeric system. The same basic checks in Section 4 apply before deeper diagnosis.

Code	What It Means
E1 / F1	Temperature or sensor fault
E2	Indoor temperature sensor fault
E3	Indoor-outdoor communication error
E4	Outdoor temperature sensor fault
E5	Room temperature sensor fault
E6	Indoor unit and control panel communication fault
E7	Indoor fan motor fault
E8	High-pressure protection or refrigerant/high-pressure system issue

DIY Fix or Call a Technician? Quick Decision Checklist

You Can Try Yourself	Needs a Professional Technician
Power cycling the unit	Sensor resistance testing and replacement
Cleaning air filters	PCB inspection or replacement
Checking for blocked airflow	Compressor winding tests
Checking sensor wiring for obvious looseness	Refrigerant leak checks and recharging
Checking supply voltage with a stabilizer installed	Inverter module or IPM repair
	Opening the outdoor unit electrical panel

High-voltage components inside the outdoor unit can cause serious injury, so any fix involving the PCB, compressor, or refrigerant system should be handled by a certified technician.

Key Takeaways

Most Hisense AC error codes trace back to sensor faults, wiring issues, PCB problems, or power supply irregularities. Simple checks like power cycling the unit, cleaning filters, and inspecting wiring resolve many of these issues without professional help.

However, codes involving the compressor, PCB, or refrigerant system need proper diagnostic tools. Have these verified by a certified technician like Urban Service Plaza to avoid further damage or safety risks.