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Samsung Air Conditioner E466 Error Code
Power supply voltage problem. Here is what it means and how to clear it, easiest fix first.
The outdoor unit has detected that the DC voltage inside its inverter is too low or too high. This usually traces back to the incoming power supply, a loose supply connection or an inverter board fault.
Shown as E466 or C466. Some models also use E483 for an over-voltage condition. Meanings here come from Samsung service and installation manuals for specific model families; codes vary by series and region, so check your owner's or service manual.
How to fix Samsung E466
Check the breaker
Make sure the breaker for the outdoor unit is fully on and hasn't half-tripped. If it trips again when reset, leave it off.
Reset the power at the breaker
Switch off the breaker that feeds the air conditioner (some systems have separate breakers for the indoor and outdoor units, so switch off both). Wait about five minutes, switch the power back on and restart the unit to see if the code clears.
When to call a technician
If the code persists, have a technician or electrician check the supply voltage and the inverter board.
Parts that commonly cause E466
- power supply wiring
- inverter PCB
Order parts by your exact model number so they fit.
Other Samsung air conditioner codes
- CFFilter cleaning reminder
- ClAuto Clean running
- dFDefrosting the outdoor unit
- E101Indoor and outdoor units aren't communicating
- E121Room temperature sensor fault
- E122 / E123Indoor coil temperature sensor fault
- E154Indoor fan error
- E162 / E163Control board memory error
- E153 / E665Drain pump or float switch problem
- E554Refrigerant leak or low refrigerant
- E422Refrigerant flow blocked
- E458Outdoor fan error
- E416Compressor running too hot
- E221 / E231 / E251Outdoor temperature sensor fault
- E461 / E464Compressor or inverter fault
- E440 / E441Outside temperature beyond operating limit
Frequently asked questions
What does E466 mean on a Samsung air conditioner?
The outdoor unit has detected that the DC voltage inside its inverter is too low or too high. This usually traces back to the incoming power supply, a loose supply connection or an inverter board fault.
Can I fix Samsung E466 myself?
Only the basic checks. You can safely try the steps above, but E466 usually points to a part or fault that needs a technician.
What if E466 keeps coming back?
A code that returns after a reset and the checks above usually means a part is wearing out. Note when E466 appears (which cycle, how often) and have your model number ready; it helps a technician bring the right part on the first visit.
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.