Daikin Air Conditioner Error C1

⚡ Quick Answer: The Daikin Air Conditioner C1 error indicates a communication failure between the indoor and outdoor units, often caused by issues with the internal c... ✅ DIY Fixable

What Does Error C1 Mean?

The Daikin Air Conditioner C1 error indicates a communication failure between the indoor and outdoor units, often caused by issues with the internal control boards. Symptoms include the indoor unit stopping shortly after starting, the C1 error code flashing on the panel, and no response to control inputs. This error typically arises from faults in the communication wiring or connections between the main PCB and sub PCB/fan control board.

Common Symptoms:

  • Indoor unit stops operation shortly after start
  • Error code C1 displayed/blinking on panel
  • No response to control inputs

Possible Causes

  • Communication fault between indoor unit PCB and sub PCB/fan PCB (medium)

How to Fix Error C1

DIY Fix Basic Inspection and Reset

  1. Turn off the air conditioner and disconnect power at the circuit breaker.
  2. Wait 5–10 minutes to allow all internal capacitors to discharge.
  3. Reconnect power and restart the unit.
  4. Observe if the error returns.

Technician Only Check and Repair Internal Communication Wiring/Boards

  1. Inspect the communication wiring/connectors between the indoor main PCB and sub PCB/fan control board for corrosion, loose pins, or damage.
  2. Test continuity and proper signals on the communication lines.
  3. Replace faulty PCBs or harnesses if communication cannot be restored.
  4. Verify correct operation after repair.

Parts needed: Indoor unit main PCB, Indoor unit sub PCB / fan control board, Communication wiring harness/connectors

🛑 When to Call a Pro:
  • If the error persists after a power reset and basic inspection.
  • If there is any sign of electrical damage, burning smell, or repeated communication errors.
  • If you are not experienced with HVAC electrical systems.

Next step

Choose the next step for C1

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Check during diagnosis

Most relevant component to inspect

HVAC Control Board

Controls fan, compressor, sensor, and communication functions in the HVAC unit.

Typical part-only price
$90 - $320
DIY difficulty
Hard
Estimated time
45-120 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Possible related component

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

$20 - $120 · Medium · 30-90 mins

Check fit & price
Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

Common Questions

What does C1 error mean on Daikin Air Conditioner?

C1 error indicates a communication failure between the indoor and outdoor units, causing operation stoppage.

Can I fix Daikin Air Conditioner C1 error myself?

Yes, try turning off the unit, disconnecting power for 5-10 minutes, then reconnecting and restarting.

How much does it cost to fix C1 error?

Repair costs for the C1 error typically range from $100 to $500, depending on parts and region.

When should I call a technician for C1?

Call a technician if the error persists after a reset, or if you notice electrical damage or burning smells.

Sources & References

Data last verified: 2026-07-31

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