Air Conditioner
Samsung
Updated Jul 17, 2026
Samsung AC E202 Error — Indoor/Outdoor Communication Fault & Fix
E202
Samsung · Air ConditionerE202 on a Samsung AC means the indoor and outdoor units have lost communication after the…
Quick answer
E202 on a Samsung AC means the indoor and outdoor units have lost communication after the initial tracking was complete.
What E202 means
After the outdoor unit finishes tracking all connected indoor units, it maintains a communication link. E202 appears when that link drops — the outdoor unit is no longer receiving data from one or more indoor units.
How to fix it
Focus on the communication cable between indoor and outdoor units.
What does the E202 code mean?
E202 is a communication error between the indoor and outdoor units. Data transmission has failed after the initial tracking process completed successfully.
Common causes
- Loose or damaged communication cable between indoor and outdoor units
- Wrong cable polarity (swapped wires)
- Cable run too long or using incorrect gauge
- PCB fault on either the indoor or outdoor unit
- Electrical interference from nearby power cables
Advertisement · In-content
How to fix the E202 error
Power off the entire system
Switch the breaker off for both indoor and outdoor units.
Inspect communication wiring
Check terminal blocks at both ends. Tighten any loose screws. Verify polarity matches the wiring diagram.
Check cable condition
Look for cuts, kinks, or rodent damage along the cable run.
Separate from power cables
Communication cables should not run parallel to mains power cables — electromagnetic interference can disrupt the signal.
Power on and observe
Restore power. The outdoor unit will re-track. If E202 clears, the issue was a loose connection.
Safety first: Communication terminals carry low voltage, but the PCB is connected to mains. Isolate power before touching any terminals.
Part you may need: Communication cable (2-core or 3-core shielded)
Use shielded cable if the run exceeds 15 metres or passes near power lines.
Frequently asked questions
Can weather cause E202?
Not directly, but moisture in a damaged cable joint can cause intermittent communication loss.
E202 vs E101?
E101 is a timeout during initial communication. E202 occurs after tracking is already complete — usually a wiring issue.
✎ 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.
