Daikin Heat Pump Error Code E8

The E8 code means the heat pump has detected input overcurrent, where the compressor circuit is drawing more than approximately 12.0 to 12.5 amperes for 2.5 seconds during operation. The system shuts down automatically to prevent damage to the compressor and electrical components. This is a protective fault that requires diagnosing the underlying cause rather than simply resetting the unit.

No, you should not attempt to force the unit to keep running while the E8 fault is active. The overcurrent condition indicates the compressor is under excessive electrical stress, and continued operation without resolving the root cause can permanently damage the compressor, inverter board, or other components. Allow the unit to remain off until the fault has been properly diagnosed and corrected.

Repair costs depend entirely on what is causing the overcurrent condition. A coil cleaning or refrigerant adjustment will typically cost far less than replacing a failed compressor or inverter board, which can range from several hundred to well over a thousand dollars depending on the model and labor rates in your area. Getting a diagnosis from a qualified technician first is the best way to understand what repairs are actually needed before committing to a repair versus replacement decision.

Some basic checks are within reach for a knowledgeable homeowner, such as inspecting and cleaning the outdoor coil, removing obstructions from around the unit, and verifying that airflow is not restricted. However, measuring input current, checking refrigerant pressures, and testing electrical components like the inverter board require specialized tools and should be performed by a qualified HVAC technician. Attempting to work inside the electrical cabinet without proper training is not recommended.

A reset may temporarily clear the fault code and allow the unit to restart, but if the underlying cause has not been corrected, the E8 error will return once the compressor runs long enough to exceed the current threshold again. Repeated resets without addressing the root cause increase the risk of permanent compressor or inverter damage. A proper diagnostic inspection should be completed before returning the unit to service.