LG Heat Pump Error Code E2

E2 indicates a tracking error, meaning the outdoor unit was unable to confirm communication with the expected number of indoor units after five attempts. The outdoor unit PCB has a setting switch that specifies how many indoor units are connected, and if that number does not match what the system can actually detect, the E2 fault is triggered. It can also appear if communication fails entirely during the initial tracking sequence.

The system will typically not operate normally while the E2 fault is active, as the outdoor unit cannot confirm the configuration of the indoor units connected to it. Continuing to attempt operation without resolving the underlying tracking or communication issue is not recommended, as it can mask wiring problems and potentially cause further issues. The fault should be diagnosed and corrected before returning the system to regular use.

If the fix is simply correcting the indoor unit count setting on the outdoor PCB or reseating a loose wire, the cost may be limited to a service call fee, typically in the range of $75 to $150. If a communication wiring run needs repair or replacement, costs can range from $150 to $400 depending on the length and accessibility of the wiring. Replacing a failed indoor unit PCB can add $200 to $600 or more in parts and labor depending on the unit model.

Start by checking the indoor unit numbers setting switch on the outdoor unit PCB and confirming it matches the number of indoor units physically installed. Next, inspect all communication wiring between the outdoor and indoor units for loose terminals, broken conductors, or reversed polarity. If the wiring and settings are correct but the error persists, check that each indoor unit is receiving power and communicating properly. A failed indoor unit PCB may require professional testing and replacement.

A power reset will clear the active fault and allow the system to run the tracking sequence again, but if the underlying cause is not corrected, the E2 error will return. The system must successfully complete five tracking attempts that match the set indoor unit count before the fault clears permanently. Address the root cause, such as the switch setting or a wiring fault, before resetting the unit.