C4 🟡 Repair Required
Daikin Error Code C4: Heat Exchanger Thermistor Fault
⚠️ Your Daikin HVAC system has detected a potential issue with the heat exchanger thermistor. It's safe to continue using the system, but a professional repair is recommended.
How to Fix Daikin Code C4
- Check if the thermostat is set to the correct mode and temperature
- Turn off the system and turn it back on after a few minutes to see if the error clears
- Contact a professional HVAC technician for repair
What Does Daikin Error Code C4 Mean?
The Daikin C4 error code indicates a fault with the heat exchanger thermistor. This component measures the temperature of the heat exchanger, which is crucial for maintaining the correct temperature in your home. If the thermistor fails, your HVAC system may not function correctly, leading to comfort issues and potentially causing the system to shut down. This error is typically caused by a faulty thermistor, but it could also be due to a wiring issue or a problem with the control board.
Common Causes of Daikin Code C4
- Faulty heat exchanger thermistor
- Wiring issue between the thermistor and control board
- Problem with the control board
Applicable Daikin Models
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Find a Licensed Tech Near You →Replacement Parts for Daikin Mini-Split Code C4
Heat Exchanger Thermistor OEM: 4000012000