LG mini split error code CH35
Low pressure too low (pressure sensor). Also shown as CH 35, CH35.
- TypeProtection
- SystemRefrigerant circuit
- Can I fix it?Homeowner checks, then maybe a tech
What CH35 means on a LG
The low-side pressure sensor reads below the limit. Usually low charge or a restriction.
On this platform, CH35 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- Low charge from a leak.
- A service valve not fully open.
- A kinked line set.
- A frozen indoor coil.
How to fix it yourself
Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician.
- Open both service valves fully.
- Pull the front panel and check the filters and the indoor coil. Dirty filters and a matted coil restrict airflow, and airflow problems trigger a surprising number of protection codes.
- Leak-check the flare joints.
- Anything inside the refrigerant circuit (sensors are fine, but valves, compressors and leaks are not) needs EPA-certified refrigerant handling. That is a technician job.
Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.
When to call a technician
A technician must measure the charge.
Which LG units show CH35
This page applies to LG Art Cool, Standard, Mega and Multi F units. LG's own documentation lists CH35 as "Low pressure too low (pressure sensor)", the same definition used across the LG it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.
Where LG shows this code
The indoor display shows CH followed by a number (CH05, CH38). Units without a display blink the indicator lamps in a pattern; the outdoor board LEDs blink the same number. If someone tells you 'CH 5', that is CH05. CH01 to CH12 are indoor-unit faults, CH21 to CH29 are inverter and compressor faults, CH32 to CH38 are refrigerant-side protections, CH40 to CH48 are outdoor sensors, and CH51 to CH73 are outdoor-unit system faults.
Other LG codes
Same part of the system as CH35:
Questions people ask
Can I reset a LG CH35 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If CH35 comes back, the fault is real and needs the checks above.
Is it safe to keep running a LG showing CH35?
Not repeatedly. A protection code means the unit stopped itself to prevent damage, and resetting it over and over can turn a cheap repair into a compressor failure. Reset once, check the basics, and stop if it returns.
Do I need a technician for LG CH35?
Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician. A technician must measure the charge.
Sources
- LG residential split service manuals (error code tables)
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.