LG CH07 error code: indoor units set to conflicting modes
LG CH07 on a multi-split means two indoor units on one outdoor unit are set to modes that cannot run together. The rule, and the one step that clears it.
What this means
LG shows CH07 on a multi-split when the indoor units connected to one outdoor unit are set to modes that cannot run at the same time, such as one head in heating and another in cooling or dehumidification. It is a setting conflict, not a hardware fault, and it clears when every head is set to a compatible mode.
Equipment and model context
LG multi-split systems where several indoor units share one outdoor unit
- LG Multi F
- LG Multi F Max
- Art Cool multi-zone heads
- ceiling cassette multi-zone heads
This applies to LG multi-split systems where more than one indoor unit shares a single outdoor unit. A single-split system with one indoor and one outdoor unit does not produce CH07 for this reason, so confirm the system is a multi-split first.
What you may notice
- One or more indoor units stop and display CH07, while the system was running with heads set to different modes.
- A head that will not heat or cool sits idle even though its remote shows the mode selected and the temperature set.
Likely causes
- One indoor unit is set to heating while another on the same outdoor unit is set to cooling or dry mode, which the shared refrigerant circuit cannot deliver at once.
- A head left on an old mode from a previous season conflicts with a head that has just been switched to the opposite mode.
Diagnostic paths
CH07 after switching one room between heating and cooling
The system ran without complaint until someone changed one head from cooling to heating, or the reverse, and CH07 appeared on that head or another.
Set every indoor unit on that outdoor unit to the same class of mode, either all heating or all cooling, then restart the units. Fan and air-purification modes can stay as they are.
CH07 at the start of a season with heads on mixed settings
The changeover from cooling season to heating season left some heads still set to cool, and turning on a heating head brought up CH07.
Go around each indoor remote and confirm the mode, setting all of them to heating for winter or all to cooling for summer. Once they agree, the code clears on the next start.
A multi-split has one outdoor unit and one refrigerant circuit feeding every indoor head. That circuit can be set up to move heat into the rooms or out of them, but not both directions at the same moment.
- One outdoor unitRuns one refrigerant circuit for all heads
- Shared circuit directionSet for heating or for cooling, not both
- Head asking to heatNeeds the circuit moving heat indoors
- Head asking to coolNeeds the circuit moving heat outdoors
- CH07Control refuses the impossible combination
| Modes selected across the heads | Allowed together | Result |
|---|---|---|
| All heads cooling, or all heads heating | Yes | System runs normally |
| One head heating, another cooling or dry | No | CH07 on one or more heads |
| Any head in fan or air-purification only | Yes, alongside either class | No conflict from those heads |
CH07 is the system enforcing a rule, not reporting a break
A standard LG multi-split runs several indoor heads from one outdoor unit and one refrigerant circuit. That circuit can be arranged to carry heat into the house for heating or out of the house for cooling, and it holds one of those directions at a time. If one head is asking for heating while another is asking for cooling or dehumidification, the system is being told to do two opposite things with one circuit, which it cannot, so it stops the conflicting heads and shows CH07.
Because it is a logic check rather than a component failure, there is nothing to repair. LG states that every indoor unit connected to a single outdoor unit must be used in cooling only or heating only, and that cooling and dehumidification cannot run at the same time as heating. Fan and air-purification modes sit outside that rule and can be used on any head without triggering the code.
Clearing it and keeping it away
The fix is to make the heads agree. Go to each indoor remote, check the mode, and set them all to the same class: all heating in winter, all cooling in summer. Once the modes match, restart the units and CH07 clears on the next run. If a room genuinely needs the opposite of the rest of the house, the choices are to run that head in fan mode, to leave it off, or to have a system that supports simultaneous heating and cooling, which is a different class of equipment.
The setting that people forget is the seasonal changeover. At the turn of the season, one or two heads left on last season's mode will conflict the moment a head is switched the other way. A quick pass through every remote when the weather changes prevents CH07 from appearing at all.
What to give the technician
Tell the technician how many indoor units share the outdoor unit, the mode each was set to when CH07 appeared, whether setting them all the same cleared it, and whether any head uses a wired wall controller.
Safe homeowner checks
- Check the mode shown on every indoor remote for units sharing the outdoor unit, and set them all to heating or all to cooling.
- After the modes match, turn the affected heads off and on again and confirm CH07 has cleared.
Is a reset appropriate?
Turning the heads off and on after matching their modes is the reset. If CH07 returns with every head confirmed on one mode, stop and have the controllers checked.
When to call a technician
- If CH07 stays after every head is confirmed on the same mode, a wired controller or communication fault may be reporting a mode incorrectly, which needs an LG technician.
Questions people ask about this
Why do all my LG indoor units have to be on the same mode?
They share one outdoor unit and one refrigerant circuit, which can move heat in or out of the house at a given time, not both. Mixing heating and cooling requests produces CH07.
Can I run one LG head in fan mode while others heat?
Yes. Fan and air-purification modes do not ask the circuit to heat or cool, so they can run on any head alongside all-heating or all-cooling without triggering CH07.
CH07 will not clear even though every head is set to heat. Why?
If the modes genuinely match and CH07 stays, a wired controller or a communication fault may be reporting a head's mode incorrectly. That needs an LG technician to check the controllers.
Evidence recordHow this page was checked
official manufacturer support article · checked 2026-09-09
Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: LG Electronics technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.
- Documentation class
- official manufacturer support article
- Scope of the definition
- LG multi-split systems where several indoor units share one outdoor unit
- Last checked
- 2026-09-09