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Samsung Air Conditioner E153 / E665 Error Code
Drain pump or float switch problem. Here is what it means and how to clear it, easiest fix first.
The indoor unit's condensate drain system has a problem. On the models whose manuals list it, E153 means the float switch has detected water rising in the drain pan, while E665 relates to the drain pump or, on some systems, the input from an external drain pump. A blocked drain line or a failed pump is the usual cause.
Samsung lists E153 in the service manual for some wall-mount models fitted with a float switch, and E665 on models that use a drain pump, including wall units set up with an external pump. Gravity-drained units without a pump or float switch won't show them. Exact meanings vary by series and region; check your manual.
How to fix Samsung E153 / E665
Switch off the power
Switch off the air conditioner's breaker before checking anything. If water is dripping near an outlet or light fixture, switch off the breaker for that circuit too.
Check the drain line outlet
Find where the condensate line ends, outdoors or at a floor drain, and clear any dirt, leaves or insect nests you can reach at the open end.
Clean the filters and reset
Wash the indoor filters and let them dry before refitting, then restore power at the breaker and restart the unit.
When to call a technician
If the code returns, the drain pump, float switch or internal drain line needs a technician.
Parts that commonly cause E153 / E665
- drain pump
- float switch
- condensate drain line
- air filter
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
- 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
- E466Power supply voltage problem
- E440 / E441Outside temperature beyond operating limit
Frequently asked questions
What does E153 / E665 mean on a Samsung air conditioner?
The indoor unit's condensate drain system has a problem. On the models whose manuals list it, E153 means the float switch has detected water rising in the drain pan, while E665 relates to the drain pump or, on some systems, the input from an external drain pump. A blocked drain line or a failed pump is the usual cause.
Can I fix Samsung E153 / E665 myself?
Often. The first steps above are safe checks a homeowner can do. If they don't clear E153 / E665, the cause is likely a worn part that needs replacing.
What if E153 / E665 keeps coming back?
A code that returns after a reset and the checks above usually means a part is wearing out. Note when E153 / E665 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.