LG systems in San Leandro homes are almost always ductless heat pumps: an outdoor unit with an inverter-driven compressor and one or more indoor heads that both cool and heat. A typical call is one head that stopped cooling, water running down the wall under a head, or an error code on the display. The repair starts with the exact code, which heads are affected and how the outdoor unit responds, not with central-AC troubleshooting. We are an independent service company, not affiliated with LG.
The LG equipment we work on
- Art Cool wall units, including the Art Cool Premier and the Art Cool Gallery with its frame-style front panel.
- Multi F multi-zone systems: one outdoor unit serving two or more heads, often a living-room unit plus bedrooms.
- LG Red series heat pumps, built to keep heating in low outdoor temperatures.
- Multi V VRF systems in commercial buildings; see commercial HVAC.
- ThinQ Wi-Fi control, which lets the system be run from a phone.
How LG ductless systems differ from central air
LG outdoor units use an inverter-driven compressor (on some models, LG’s Dual Inverter Compressor) that speeds up and slows down with the load instead of switching on and off. There is no start capacitor and contactor to swap, as on a conventional air conditioner; a dead outdoor unit is more often a sensor, a power supply problem or the inverter board. Each indoor head has its own sensors, fan motor, drain and control board, and talks to the outdoor unit over communication wiring. On a Multi F system the outdoor unit meters refrigerant to each zone separately, which is why one room can be cold while the next one is fine. When something fails, the indoor unit shows an error code, on many LG models starting with “CH”. The code tells us which circuit to test; it is not a parts order.
Common LG problems
| What you notice | Likely cause | What it usually takes |
|---|---|---|
| One head blows room-temperature air, the others work | Dirty filter or coil, a zone sensor, communication, or that zone’s refrigerant metering | Zone-by-zone testing before the outdoor unit is blamed |
| Water dripping from an indoor head | Clogged drain line, poor slope or a dirty coil | Clearing and re-sloping the drain, cleaning the coil |
| Error code and the system shuts down | Sensor, communication wiring or a control board | Reading the code, testing wiring and sensors while running |
| Outdoor unit steams and the indoor fan pauses on a cold morning | Normal defrost cycle | Nothing, unless it repeats all day |
| Musty smell when a head starts | Dust and mold on the blower wheel and coil | Deep cleaning of the indoor unit |
| ThinQ shows the unit offline | Wi-Fi or router change, not a refrigeration fault | Re-pairing the module |
Safe checks before you call
- Lift the front panel, slide out the indoor filters, rinse them and let them dry before putting them back.
- Check the remote: the mode (cool, heat, dry or auto), the set temperature, and that it is not on fan only.
- Check the breaker and the outdoor disconnect.
- Write down the code and which heads show it.
If water is running down the wall, switch that head off and call. Repeated leaks damage drywall and floors.
What to have ready
- The model and serial number from the label on the outdoor unit and from each indoor head (usually on the side of the unit or under the front cover). Photos are fine.
- Which heads are affected, and whether the problem is in cooling, heating or both.
- When the system was installed and any registration confirmation you received.
Parts and warranty
LG inverter boards, indoor control boards, sensors and fan motors are specific to the model, and on a multi-zone system they must match the outdoor unit. We confirm the exact part by model and serial number before quoting and tell you if it has to be ordered. A covered part keeps LG’s parts warranty; how long that runs depends on the product and often on whether the system was registered, so keep the registration confirmation with your papers. The parts warranty does not pay for labor. Our repairs carry a 90-day warranty, and refrigerant work is done by EPA-certified technicians.
Repair or replace
A zone-specific failure, such as a sensor, a drain or an indoor fan motor, on an otherwise healthy system is a mini-split repair. A failed compressor or outdoor inverter board on an older system, or a leak in a line set hidden inside a wall, is where comparing repair with a new ductless system makes sense. If you are adding heads or replacing a furnace with a heat pump, see heat pump installation.
Local notes
In San Leandro, San Lorenzo and Castro Valley, LG ductless systems often serve rooms the original ductwork never reached: a converted garage, a room addition, an upstairs bedroom that bakes on late-summer afternoons. Our winters are mild, so most heating complaints come down to filters, sensors or defrost behavior on foggy mornings rather than a lack of capacity. Clean the filters every few weeks during heavy use and have the coils and drains checked once a year.