LG, founded in 1958 and based in Seoul, is best known for consumer electronics, and its heating and cooling equipment shows it: Wi-Fi control through the ThinQ app, inverter compressors and indoor units designed to look good on a living room wall. In Fremont, Newark and Milpitas homes that means ductless heat pumps that cool and heat. The usual calls are one room that stopped cooling, water dripping from an indoor unit, an error code on the display, or an app that lost the connection. We diagnose them as the ductless systems they are, test before replacing parts, and quote the price before work starts. We are an independent service company, not affiliated with LG.
The LG lines we work on
- Art Cool — wall-mounted indoor units with styled front panels, used on single-zone systems or as part of a multi-zone system.
- Multi F — residential multi-zone systems: one outdoor unit serving several indoor units.
- LGRED heat pumps — models built to keep heating at low outdoor temperatures.
- Dual Inverter compressor — LG’s inverter compressor design, used on many of its systems; it speeds up and slows down with the load instead of switching on and off.
- Multi V — VRF systems for larger buildings and commercial spaces, with their own controls and service tools. Tell us the building type and the outdoor model when you call.
Multi F as room-by-room zoning
A Multi F system is zoning without dampers: each indoor unit has its own sensor, set temperature and schedule. Used well, that keeps a home office cool on a hot afternoon while unused bedrooms are set back. Two things to know:
- One mode at a time. The outdoor unit either heats or cools. If rooms disagree, one waits.
- Where the fault sits. A problem in one indoor unit stops one room; a fault in the outdoor unit stops every room. That is the fastest way to tell how big a repair is.
Our smart home guides compare this with ducted zoning.
ThinQ: what the app is good for
ThinQ lets you change modes and temperatures, set schedules and check whether a unit is running from your phone. It is also the first thing to rule out: an “offline” unit almost always means a router change, a new Wi-Fi password or a weak signal at the indoor unit, and the system still runs from its remote. What the app cannot see is the refrigerant charge, a clogged drain or a dirty coil, so a unit that stops cooling while the app looks normal still needs a technician. If the indoor display shows a code, write it down even if the app shows nothing.
Common LG problems
| What you notice | Likely cause | What it usually takes |
|---|---|---|
| Error code on the indoor unit, system stopped | Sensor, communication wiring or a board | Reading the code, testing that circuit while running |
| One room at room temperature, the others fine | Filter, coil, sensor or that zone’s refrigerant metering | Zone-by-zone testing before the outdoor unit is blamed |
| Water dripping from an indoor unit | Clogged or poorly sloped drain, dirty coil | Clearing and re-sloping the drain, cleaning the coil |
| Outdoor fan runs, no cooling or heating | Inverter board, compressor drive or a sensor | Electrical tests on the outdoor unit |
| Musty smell when a unit starts | Dirty coil and blower wheel | Deep cleaning of the indoor unit |
Repairs of every ductless brand are covered on our mini-split repair page.
What to have ready
- Photos of the labels on the outdoor unit and on each indoor unit (side of the unit or under the front cover), with model and serial numbers.
- The error code and which indoor units show it.
- The install date and any installation paperwork.
Parts and warranty
LG inverter boards, indoor control boards, sensors and fan motors are specific to the model, and on a multi-zone system must match the outdoor unit. We use factory certified parts only and confirm the exact part by model and serial number before quoting. A covered part keeps LG’s parts warranty, which depends on the product and the install date and does not include labor. Our repair work carries a 90-day workmanship warranty, and refrigerant work is done by EPA-certified technicians.
Installing LG ductless
A new LG system starts with a free in-home estimate: which rooms need their own indoor unit, single-zone or Multi F, standard or LGRED, and where the line set, the drain and the outdoor unit go. See mini-split installation, or heat pump installation if the plan is to replace a furnace.
Local notes
Milpitas has many townhomes and condos with shared walls, compact mechanical closets and condensers on a roof or in a side yard, which is where a ductless LG system fits well; in a condo, the outdoor unit’s spot may need HOA approval. In Fremont and Newark single-family homes, an LG unit also suits a room the ducts serve poorly, such as a converted garage, an addition or an upstairs bedroom. Local pages: LG in Milpitas, Fremont and Newark.