Indoor unit shows E461; unit may not respond or may shut down.

Safety first: Disconnect power before inspecting the indoor PCB.

• Step 1 – Power reset: Turn off the breaker for 10 minutes, then restore power and test.
• Step 2 – Check PCB history: If the PCB was recently replaced, confirm it is the correct Samsung part and that any required configuration steps were completed.
• Step 3 – Avoid repeated resets: If E461 returns immediately, further resets are unlikely to help.
• Technician required: EEPROM reprogramming or PCB replacement must be done by an authorized Samsung service provider with access to the correct firmware.