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.

Technical Specifications

wattage N/A
component Communication Cable
resistance N/A
part_number DAIKIN-123456
voltage_rating 230V AC

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: 2026-07-01

User Comments (0)

Share your experience or solution below.

Be the first to comment!