Samsung Air Conditioner Error Code E355

E355 indicates that the Intelligent Power Module controlling the second fan motor (Fan2) has overheated and triggered a thermal protection shutdown. The system stops operation to prevent damage to the IPM and surrounding components. The fault is most commonly related to restricted heat dissipation at the heat sink assembly or a physical obstruction near the fan.

No. The E355 error causes the unit to shut down specifically to protect the IPM from damage. Attempting to bypass or repeatedly restart the unit without resolving the underlying cause can lead to permanent failure of the IPM or fan motor, resulting in a more costly repair.

Repair costs vary depending on the cause. A cleaning and heat sink service call typically runs in the range of $75 to $150. If the thermal interface material needs replacement, costs are similar. A Fan2 motor replacement can range from $150 to $400 depending on the model, and IPM replacement can cost between $200 and $600 or more including parts and labor.

Some steps are safe for a knowledgeable homeowner, such as inspecting the outdoor unit for visible debris, clearing obstructions around the unit, and cleaning accessible fan grilles. However, inspecting the internal heat sink assembly, checking the IPM, or replacing components involves working with high-voltage electronics and is best handled by a qualified technician.

A power reset may temporarily clear the fault code and allow the unit to restart, but if the underlying cause such as a blocked heat sink or failing fan motor is not corrected, the error will return once the IPM heats up again. The fault should be diagnosed and resolved before relying on the unit for continued operation.