LG Aircon Owner's Guide: Faults, Parts and Warranty

Use these first if your LG unit is already showing a blinking light, error code, or repeat fault.

Twelve LG models appear in NEA's register of 22 July 2026, split evenly between single and multi splits. Single-split codes run through the S3UZ, S3UQ and ZUUQ families, while the multi-split range splits across Z2, Z3 and Z4 codes.

ArtCool and ArtCool Mirror are indoor panel designs, so the outdoor code still decides which compressor family the system belongs to. Read the suffix as well, because variants within one code use different parts.

Every model registered today falls inside those six code families, so the outdoor plate is the fastest identifier. A plate carrying anything else belongs to an older generation, and its parts do not follow the current list.

LG attaches cover to registration soon after purchase, or to proof of purchase when it is requested. A product that satisfies neither condition is treated as outside the warranty in LG's own wording.

Cover also names one owner and one installation location, and it is not transferable. A unit inherited with a resale flat, or moved to another address, sits outside that wording. Budget the repair as an uncovered job unless LG confirms otherwise in writing.

Consumables sit outside cover, including gas, piping and installation materials. A unit that is not reasonably accessible may be excluded as well. Keep the registration, the dated invoice, the card and the service history together.

Four documents carry most claims. Keep the registration confirmation, the dated invoice from an authorised dealer, the warranty card and the service history together. Assemble that file while the system works, because a stopped unit is the worst time to hunt for paperwork.

The LG aircon warranty guide lists every exclusion, from parallel imports to unauthorised repairs. Any promotional extension should be confirmed in writing with the seller before a claim is built on it.

A CH code on an LG display names the circuit, and the surrounding symptoms usually confirm it. Fan motor lock, indoor-outdoor communication, low pressure and low refrigerant account for a large share of calls.

• •CH10 flags an indoor fan motor that has locked or stopped, which shows as weak airflow and a unit that keeps running.
• •CH05 is a communication failure between the indoor and outdoor boards, and it often follows a power interruption.
• •CH35 points at low pressure, and CH38 is a low-refrigerant warning that owners often misread as a drain fault.
• •A weak outdoor capacitor makes the compressor hum or click without starting, and owners tend to hear a compressor failure.
• •Gas loss at a flare or pipe joint returns unless the leak is found and sealed, so a pressure test comes before any top-up.

Parts supply, panel handling and system age set the frame for LG. Recent models sit well on parts, while older ArtCool panels and boards are the items that take sourcing. Name the exact model suffix before approving any part, because the variant decides what fits.

A significant share of LG compressor calls turn out to be a capacitor or board, and the symptoms look identical from the room. Test the cheaper circuit first, because a compressor swap is the most expensive way to find out it was never the compressor.

Send the exact CH code, the model suffix from the outdoor plate and whether the outdoor unit starts. Add when the fault began, whether cooling returns at all, and how the unit behaves on start-up.

The code plus the start behaviour usually separates a sensor or board fault from a gas problem before the visit is booked. A photo of the nameplate and one of the display help, because the suffix decides which part gets ordered.

Expect a straight answer on whether the fault means a service, a repair or a replacement path, and what evidence supports it.