Check these first, whatever the brand
- Reset once
Samsung and LG both say electrical noise or a power problem can cause a one-off error. Switch off at the breaker, wait a few minutes, then switch back on.
- Don't keep resetting it
If the code comes back, stop using the unit. Running a compressor short of refrigerant doesn't fix anything.
- Think about recent work
If it appeared after the unit was installed or moved, tell the installer. Daikin and LG both mention installation problems, such as a closed valve or a leaking joint.
- Note the code and model
Write down the code, the full model name and, if you know it, the installation date.
When it's time for an engineer
Refrigerant work is a job for a qualified engineer: in the UK an F-gas certified engineer, in the US a licensed HVAC technician. They should find and fix the leak before adding refrigerant, not just top it up.
Questions people ask
Can I add refrigerant to my air conditioner myself?
No. The refrigerant circuit is sealed, and in the UK only an F-gas certified engineer may work on it. In the US it's a job for a licensed HVAC technician.
Does a low refrigerant code always mean a leak?
Usually, but not always. The makers also list a closed service valve, a faulty sensor and, for a one-off, a power glitch. That's why a single reset is worth trying first.