Daikin Air Conditioner Error C5
⚡ Quick Answer: The Daikin Air Conditioner C5 error signifies a communication failure between the indoor and outdoor units, typically due to a malfunctioning heat exc... ✅ DIY Fixable
What Does Error C5 Mean?
The Daikin Air Conditioner C5 error signifies a communication failure between the indoor and outdoor units, typically due to a malfunctioning heat exchanger temperature thermistor. This can prevent proper cooling or heating, causing the unit to stop operation and display the C5 code. Potential causes include a faulty thermistor, poor connector contact, or an indoor unit PCB signal processing fault.
Common Symptoms:
- Unit stops operation and displays C5
- Possible overheating/abnormal temperature sensing of heat exchanger
- Indoor unit may not cool or heat properly due to sensor error
Possible Causes
- Heat exchanger temperature thermistor failure (middle or gas pipe) (medium)
- Thermistor connector poor contact or disconnection (medium)
- Indoor unit PCB signal processing fault (low)
How to Fix Error C5
DIY Fix Basic checks before technician visit
- Turn off and isolate power to the unit
- Wait a few minutes and reset power to see if the error clears
- Check that the indoor unit intake and filters are clean (no heavy obstruction)
Technician Only Service heat exchanger temperature sensor and connections
- Disconnect power and open the indoor unit access panel
- Inspect and test the heat exchanger thermistor (middle or gas pipe thermistor) for correct resistance values
- Check thermistor connector and wiring for loose contacts or damage
- Replace faulty thermistor and re-test unit operation
- If thermistor and wiring are good, test indoor PCB for proper signal processing and replace if needed
Parts needed: Heat exchanger temperature thermistor, Indoor unit PCB (if required), Wiring/connectors
- If error persists after basic reset and cleaning
- If you are not trained to safely access internal components
- If thermistor tests indicate abnormal resistance
- If PCB diagnostics are necessary
Technical Specifications
| wattage | N/A |
|---|---|
| component | Control Board |
| resistance | N/A |
| part_number | DAIKIN PCB-123456 |
| voltage_rating | 220V AC |
Common Questions
What does C5 error mean on Daikin Air Conditioner?
C5 error indicates a communication failure between indoor and outdoor units, often linked to a sensor malfunction.
Can I fix Daikin Air Conditioner C5 error myself?
Yes, you can reset the unit and check for clean filters before calling a technician.
How much does it cost to fix C5 error?
Repair costs range from $150 to $450+, depending on parts and service region.
When should I call a technician for C5?
Call a technician if the error persists after basic checks or if you're unsure about accessing internal components.
Sources & References
- Daikin Error Code Search (global support) (official)
- Daikin C5 Error Explanation (Proshop Daikin) (community)
- Daikin C5 Sensor Fault Repair Discussion (community)
Data last verified: 2026-07-01
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