Air Conditioner
Samsung
Updated Jul 18, 2026
Samsung AC E301 Error — High Pressure Sensor Fault & Fix
E301
Samsung · Air ConditionerE301 means the high-pressure sensor on the outdoor unit has an open or short circuit.
Quick answer
E301 means the high-pressure sensor on the outdoor unit has an open or short circuit.
What E301 means
The high-pressure transducer monitors the refrigerant pressure on the discharge (high) side. If the sensor wire is broken or the transducer is faulty, the board cannot monitor system pressure and stops with E301.
This is a technician-level repair. High-pressure components involve refrigerant circuits — do not attempt to disconnect the transducer yourself.
How to fix it
What does the E301 code mean?
E301 is a high-pressure sensor breakaway or fault (open/short circuit) on the outdoor unit.
Common causes
- Faulty high-pressure transducer
- Connector loose or corroded on the outdoor PCB
- Wire damage
- Outdoor PCB fault
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How to fix the E301 error
Power off
Isolate at the breaker.
Inspect the sensor connector
On the outdoor PCB, find the high-pressure sensor connector and reseat it.
Check wiring
Look for damage along the sensor cable.
Call a technician
If the transducer itself is faulty, replacing it involves the sealed refrigerant circuit and must be done by a licensed professional.
Safety first: High-pressure sensors are connected to the refrigerant circuit. Only a licensed refrigeration technician should replace them.
Part you may need: High-pressure transducer
This sensor is brazed or screwed into the refrigerant line. Replacement requires recovering refrigerant first.
Frequently asked questions
Is E301 dangerous?
The error itself is a safety feature — it stops the unit because it cannot monitor pressure. The unit is safe when stopped.
Can I reset E301?
You can try a power cycle, but if the sensor is physically faulty, the error will return immediately.
✎ Written by
REZAUL Karim (Riad)
REZAUL Karim (Riad) is the founder of ErrFixHub and a hands-on electronics and home-appliance repair specialist with over 15 years of experience diagnosing and fixing air conditioners, washing machines, refrigerators, inverters and other household appliances. He built ErrFixHub to turn cryptic error codes into clear, step-by-step fixes anyone can follow — cross-checking every code against manufacturer documentation and real repair-bench experience.
