mypros+
Error code reference

LG Air Conditioner Error Code E216

MCU branch part setup error

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 E216 error code actually means

Your LG air conditioning system's control unit is set up to expect an indoor unit connected to one of its ports, but nothing is actually plugged into that port. This is a configuration mismatch, not a broken part. Adjusting a small switch on the control unit to tell it that port is unused will typically fix the problem right away.

Diagnostic procedure

The full E216 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
Adjust dip switch for MCU branch part to 'Not-Used'; press K3 to reset.
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 E216 procedure $9.95

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

Most common causes of E216

Ranked by how often they cause this code
  1. 1Dip switch misconfigured after installation
  2. 2Indoor unit removed without updating dip switch
  3. 3Accidental switch change during servicing
  4. 4Wiring fault or disconnected communication cable
  5. 5Faulty MCU control board

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 E216

What does E216 mean on a LG air_conditioner?
E216 is an MCU branch part setup error. It means the Multi Control Unit has a port configured as active via its dip switch, but no indoor unit is detected on that port. The fix is to set the dip switch for the unused port to the 'Not-Used' position and press K3 to reset the MCU.
Is it safe to keep running my LG air conditioner while E216 is active?
E216 is a configuration fault rather than a safety hazard, but the system may restrict operation or shut down entirely until the error is resolved. It is best to address the dip switch setting promptly to restore full system function and avoid placing unnecessary strain on the MCU or other connected components.
How much does it cost to repair an E216 error on an LG air conditioner?
If the issue is simply a misconfigured dip switch, the repair cost is limited to a service call fee, typically in the range of $75 to $150 depending on your area. If the MCU control board is found to be faulty and requires replacement, parts and labor costs can range from $300 to $700 or more depending on the system model and local labor rates.
Can I fix the E216 error myself or do I need a technician?
In many cases this error can be resolved by adjusting the dip switch on the MCU branch to the 'Not-Used' position and pressing K3 to reset the unit. However, accessing the MCU board and identifying the correct dip switch requires familiarity with multi-zone system wiring and control boards. If you are not comfortable working inside the control cabinet, a qualified HVAC technician should handle it.
Will resetting the unit clear the E216 error permanently?
A reset alone will not permanently clear E216. The dip switch must first be physically changed to the 'Not-Used' position for the port that has no indoor unit connected. Once the switch is correctly set, pressing K3 to reset the MCU will clear the error and it should not return as long as the configuration matches the actual connected hardware.

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