Samsung Heat Pump Error Code E155

E155 indicates a communication error between the indoor and outdoor unit during the tracking routine. This occurs either because the tracking process could not complete (pre-tracking failure) or because the number of indoor units configured in the outdoor unit's setting switch does not match the number of indoor units actually installed. The system cannot operate normally until tracking is completed successfully.

Pressing the reset key (K3) initiates a new tracking cycle, but it will not permanently resolve the error unless the underlying configuration mismatch or communication fault is corrected first. If the indoor unit count in the setting switch is wrong or the communication wiring has a fault, the E155 error will return after the reset. Fixing the root cause before resetting is the correct sequence.

If the fix only requires correcting the setting switch configuration and pressing the reset key, the cost is primarily a service call fee, which typically ranges from $75 to $150 depending on your area. If a faulty indoor unit control board is identified as the cause, parts and labor costs for replacement can range from $200 to $600 or more. Wiring repairs fall somewhere in between depending on the extent of the damage and the labor involved.

Start by checking the outdoor unit's setting switch to confirm the indoor unit installation number matches the actual number of indoor units connected to the system. If there is a mismatch, correct the setting switch configuration. Then press the reset key (K3) on the outdoor unit to restart the tracking routine. If the error persists after the setting is corrected, inspect the communication wiring between the indoor and outdoor units for loose connections or damage.

E155 is a configuration and communication fault, not a safety-critical failure such as a refrigerant leak or electrical hazard. However, the system will not operate normally while this error is active, meaning heating or cooling will not be available. It should still be addressed promptly to restore comfort and prevent extended strain on system components from repeated failed tracking attempts.