Daikin Mini Split Error Code E4: How to Fix It

Q: What does error code E4 mean on a Daikin mini split?

Error code E4 indicates activation of the low pressure switch, meaning the refrigerant pressure is too low, often due to a leak or restricted airflow.

Q: Can I reset Daikin error code E4 by turning off the system?

Yes, turning off the system for a few minutes may clear the error if it was a temporary issue, but the underlying cause must be fixed.

Q: How do I know if my Daikin mini split has a refrigerant leak?

Look for oil stains, frost on the coils or lines, or use a leak detector. Hissing sounds may also indicate a leak. A technician can confirm and recharge the system.

Q: Is it safe to use the air conditioner with error code E4?

No, continuing to run the unit may damage the compressor. It's best to turn it off and troubleshoot.

Q: How much does it cost to fix Daikin error E4?

If it's just a filter clean, it's free. If a refrigerant leak repair is needed, costs can range from $200 to $1,500 depending on severity.

Abstract

Error code E4 on your Daikin mini split indicates that the low pressure switch has been activated. This typically means the refrigerant pressure in the system has dropped too low, which can be caused by a refrigerant leak, a blocked filter, or a faulty pressure switch. Follow these steps to diagnose and resolve the issue.