Daikin Air Conditioner Error Code L8

The L8 code on a Daikin air conditioner indicates an inverter current abnormality due to compressor overload. It triggers when the inverter secondary current exceeds 16.1 amperes for 260 seconds per phase. The system shuts down to protect the compressor and inverter components from damage caused by sustained overcurrent conditions.

No, you should not attempt to bypass or continuously reset the unit to keep it running when L8 is active. The fault exists to protect the compressor and inverter from damage caused by sustained overcurrent. Repeated operation under these conditions can result in compressor failure or inverter board damage, which are significantly more expensive repairs.

Repair costs vary widely depending on the root cause. Coil cleaning or minor refrigerant adjustments may cost between $100 and $300. Replacing an expansion valve or filter drier typically falls in the $200 to $500 range. Compressor or inverter board replacement can range from $800 to $2,500 or more depending on the unit size and parts availability. A proper diagnosis is needed before estimating total repair cost.

Some contributing factors, such as a dirty condenser coil or blocked airflow around the outdoor unit, can be addressed without professional help. However, diagnosing refrigerant charge issues, testing inverter current output, and evaluating compressor condition require specialized tools and refrigerant handling certification. Most L8 repairs should be completed by a qualified HVAC technician.

A power reset may temporarily clear the L8 code and allow the unit to restart, but the error will return if the underlying cause is not corrected. The fault condition requires that the inverter secondary current exceed 16.1A for 260 seconds per phase, so any unresolved mechanical or refrigerant issue will reproduce the fault quickly. A reset is useful for confirming the fault after repairs, not as a standalone fix.