mypros+
Error code reference

LG Air Conditioner Error Code 206

HR unit 2 sub-cooling inlet pipe temperature sensor error (open or short).

LG codesLG air conditioner codes
Avg. service call
$285
National average. Trip fee plus diagnostic plus labor. Before parts.
MyPros+ 3-day pass
$9.95
Same diagnostic steps, on your phone. Start now.
You keep in your pocket
~$275
Even before you buy the part.
Skip the service call. Fix it yourself.
Full procedure unlocks instantly.
Get Started

What the 206 error code actually means

This error means two or more of the heat recovery units in your LG multi-zone system have been given the same ID number, so the system cannot tell them apart and stops working properly. It is similar to two devices on a network having the same IP address. A technician needs to check the small dial switches on the circuit boards inside the HR units and make sure each one is set to a different number.

Diagnostic procedure

The full 206 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check connection condition of temperature sensor and lead cable.
Unlock with pass
Unlock with pass
Unlock with pass
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock 206 procedure $9.95

Or subscribe: $29/month for unlimited access to all codes plus Max AI diagnostics.

Most common causes of 206

Ranked by how often they cause this code
  1. 1Duplicate rotary switch positions on HR unit PCBs
  2. 2New HR unit added without updating address assignments
  3. 3PCB replaced without restoring original address setting
  4. 4Rotary switch moved or misread during installation
  5. 5Faulty or damaged rotary switch on HR unit PCB

Most DIYers save hundreds by diagnosing before ordering parts.

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass

Questions people ask about 206

What does 206 mean on a LG air conditioner?
Error code 206 indicates a duplicate address conflict among the HR (Heat Recovery) units in an LG 4-series multi-zone system communicating over RS-485. Each HR unit must have a unique address set via a rotary switch on its PCB. When two or more units share the same address, the system cannot distinguish between them and triggers this fault.
Is error code 206 on an LG air conditioner a safety concern?
Error 206 is a communication configuration fault rather than an electrical or refrigerant safety hazard. The system disables normal operation to prevent unpredictable behavior caused by conflicting unit addresses. While it is not an immediate safety emergency, it should be resolved promptly to restore proper heat recovery function.
Will resetting the LG air conditioner clear error code 206?
A power reset alone will not permanently clear error 206 because the underlying address conflict on the HR unit PCBs remains unchanged after a reset. The system will detect the duplicate addresses again upon restart and re-trigger the fault. The error will only clear after the rotary switch settings are corrected so that each HR unit has a distinct address.
How do I fix error code 206 on my LG air conditioner?
The fix requires inspecting the rotary switch on the PCB of every HR unit in the system and confirming that each unit has a unique, non-duplicate address setting. Identify any units sharing the same switch position, change one to an unused address, then restart the system. If the error persists after correcting all switch positions, a damaged rotary switch or PCB may need to be replaced.
How much does it cost to repair error code 206 on an LG air conditioner?
If the issue is simply an incorrect rotary switch setting, the repair cost is limited to a service call fee, typically in the range of $75 to $150, since no parts are needed. If a PCB must be replaced due to a damaged rotary switch or failed board, parts and labor costs can range from $200 to $600 or more depending on the unit model and local labor rates.

Related LG air conditioner error codes

All LG air conditioner codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass