Samsung Heat Pump Error Code E119

E119 means the outdoor unit completed its tracking cycle but did not receive a response from every indoor unit in the system. This points to a communication failure between the outdoor unit and one or more indoor units. The cause is typically a wiring issue, a loose connection on the signal line, or a faulty PCB in one of the units.

Pressing the K3 reset key on the outdoor unit PCB is actually the recommended first diagnostic step, not just a fix. If the underlying wiring or hardware fault is still present, the error will return after the tracking cycle completes. A reset only clears the error permanently if the root cause has been corrected.

If the fix is simply tightening or replacing a signal wire or connector, costs are generally low, typically in the range of a standard service call fee of $75 to $150. If a faulty indoor or outdoor unit PCB needs to be replaced, parts and labor can range from $250 to $600 or more depending on the model and the specific board required. Getting a diagnosis first will clarify which components are actually at fault.

You can start by pressing the K3 reset key on the outdoor unit PCB and watching how many indoor units respond during tracking. Visually inspecting signal wire connections at each unit for loose or corroded terminals is also within reach for a knowledgeable DIYer. However, if the fault points to a defective PCB or requires opening refrigerant circuit components, a certified HVAC technician should handle the repair.

You should not continue running the system while E119 is active. The error indicates that communication between the outdoor unit and at least one indoor unit has broken down, meaning the system cannot properly coordinate operation across all zones. Running the system in this state could result in improper operation and potential damage to the equipment.