LG has become a fast-growing share of Bay Area ductless installs, and you can see why on a wall: the Art Cool heads look nothing like a standard white box, the inverter compressors run quietly at part load instead of slamming on and off, and most of the line pairs with LG's Wi-Fi app. Add Multi F and Multi F MAX multi-zone outdoor units that feed several heads from one condenser, and it's a natural fit for homes where adding ducts was never an option. Triton services LG ductless systems across the East Bay, Tri-Valley, and Peninsula, and we keep the common parts on hand so most repairs finish in one visit.
The smart features cut both ways. When an LG faults it tells you what it thinks is wrong with a CH code — useful — but a code points at a symptom, not always at the failed part. A CH05 can be thirty seconds of wiring work or a control board, and telling the two apart is what the visit is for.
Systems we repair
- Wall-mounted heads — including the Art Cool and Art Cool Premier styles and the compact Mega series.
- Ceiling cassette heads — for rooms where a wall unit won't fit the layout.
- Single-zone systems — one outdoor condenser matched to one indoor head.
- Multi-zone systems — Multi F and Multi F MAX outdoor units running several heads, often mixing wall and cassette styles.
- Wi-Fi and smart-control features — connected heads that lose their app link after a board or router change.
Every LG system here is a heat pump, so the same equipment heats in winter and cools in summer — a fault is never just a summer problem.
Common LG problems we fix
- CH05 — indoor-to-outdoor communication error. The most-searched LG fault, and the one we're called for most: the two units can't talk. Usually loose or damaged interconnecting wiring at the terminal block, sometimes a control or comms board.
- CH38 / F4 — low refrigerant or a leak. The system runs but barely heats or cools. Licensed-tech territory under EPA rules: locate and repair the leak, then recharge to spec, rather than topping it off.
- CH04 — drain pump or float-switch fault. The condensate isn't clearing, so the head shuts down cooling before water spills. If you've seen drips or a stain on the wall below the unit, this is usually why — a clogged drain, a tired pump, or a stuck float.
- CH10 — indoor fan motor locked. The blower isn't turning: a seized or obstructed motor, or its wiring or board. You notice it as no airflow from a head that otherwise seems powered.
- CH01 / CH02 — sensor faults. A thermistor reading out of range: CH01 the room (return-air) sensor, CH02 the indoor coil sensor. Sometimes a failed sensor, often a loose connector.
- CH07 — operating-mode conflict on multi-zone systems. Not a breakage: two heads have been told to do opposite things — one heating, one cooling — and one outdoor unit can't do both at once. The fix is setting them to compatible modes.
- Dirty filters and blocked outdoor coils sit behind many "not cooling like it used to" calls, before any code appears.
LG error & fault codes
LG reports faults as CH codes — a two-digit number after the letters CH — shown directly on heads with a display or on a wired controller. Here's the part that trips people up: on units without a display, LG blinks the indoor LEDs to spell out the same two digits. The heat and cool lamps (LED1 and LED2) each blink one digit, so you reconstruct the code by counting both — a pattern that resolves to "05" is a CH05, not five of something. The ones we see most:
- CH05 — indoor-to-outdoor communication error (the most common by far).
- CH38 / F4 — low refrigerant or a leak.
- CH04 — drain pump or float switch.
- CH10 — indoor fan motor locked.
- CH01 / CH02 — room and indoor-coil sensor faults.
- CH07 — conflicting operating modes on a multi-zone system.
Blink mappings and code meanings vary by model family and board generation — CH06, for instance, is listed differently by different sources — so confirm any code against the label inside your indoor unit before buying a part.
- LG Mini Split Error Codes — the full CH table, how to read the LED blink codes, and which checks are DIY-safe.
What it costs in the Bay Area
LG ductless repairs come down to the part and whether refrigerant is involved. A capacitor runs about $130–$400 and a condensate pump or drain repair $110–$350 — the common, lower-cost fixes behind a CH04 or a weak fan. A control or comms board is roughly $220–$700, what a persistent CH05 costs when it isn't wiring, and a refrigerant leak repair and recharge runs $180–$700 — the real fix for a CH38 or F4. Most LG mini-split repairs land in the $129–$900 range. We charge a diagnostic fee that's credited toward the repair when you approve the work, and you always get a flat, upfront price before we start.
Book LG service
Triton repairs LG ductless mini-splits — Art Cool, Mega, and cassette heads, single-zone and Multi F multi-zone — across the East Bay, Tri-Valley, and Peninsula, including Dublin, San Mateo, Pleasanton, Redwood City, and San Ramon. Same-week and often same-day appointments, licensed and EPA-certified techs, upfront pricing.
Book online or call (888) 993-5699.
Related pages
- HVAC Repair in the SF Bay Area — our full heating & cooling hub
- LG Mini Split Error Codes — the CH-code and LED blink guide
- Mini Split Not Cooling — the ductless no-cool diagnosis
- Mini Split Not Heating — the winter side of the same system
- Mini Split Leaking Water — the drain symptom behind a CH04
- HVAC & AC Repair in Dublin — Tri-Valley service area
Frequently asked questions
What does CH05 mean on my LG mini split? CH05 is a communication error between the indoor and outdoor units — they've stopped talking. It's the most common LG ductless fault, and usually the cause is loose, corroded, or damaged interconnecting wiring at a terminal block. When the wiring checks out, it's typically a control or comms board. Either way it needs a tech with a meter, not a reset.
How do I read the code if my LG has no display? LG blinks it out. The heat and cool indicator lamps (LED1 and LED2) each flash one digit of the two-digit CH number, so you count both and put the digits together — the pattern that resolves to "05" is a CH05. The blink mapping varies by model family, so check your model's manual and confirm against the label inside the indoor unit.
What is CH07 on a multi-zone LG system? CH07 is an operating-mode conflict, not a breakdown. On a Multi F system one outdoor unit serves several heads and can only heat or cool at any given moment. If one head is set to heat while another is set to cool, the system flags CH07 and stops. The fix is setting the heads to compatible modes; no part has failed.
How much does LG mini-split repair cost in the Bay Area? It depends on the part. A capacitor is about $130–$400 and a condensate pump or drain repair $110–$350; a control or comms board runs $220–$700, and a refrigerant leak repair and recharge $180–$700. Most repairs land in the $129–$900 range. The diagnostic fee is credited toward the repair when you approve the work.
Do you service LG Art Cool and Multi F systems in my city? Yes — Art Cool, Mega, and cassette heads on both single-zone and Multi F multi-zone systems. We cover the East Bay, Tri-Valley, and Peninsula, including Dublin, San Mateo, Pleasanton, Redwood City, and San Ramon, with same-week and often same-day appointments. Call (888) 993-5699 to book.