E471
Samsung
Indoor Drain Pump Error (if equipped)
Indoor unit shows E471; unit may not start or may shut down.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked condensate drain, Failed internal drain pump, Float switch stuck or faulty, Kinked drain hose
How to Fix / Troubleshooting
Safety first: Turn off power and be prepared for water spillage when opening drain components.
- Step 1 – Check for water leak: Inspect around the indoor unit for water pooling or dripping.
- Step 2 – Clean drain pan and filter: Remove the front cover and filters. Clean the condensate pan of slime, algae, and debris.
- Step 3 – Clear drain line: Locate the drain hose and ensure it is not kinked or elevated above the unit. Use a wet/dry vacuum at the drain outlet to clear blockages.
- Step 4 – Inspect float switch: If accessible, gently move the float to ensure it is not stuck in the up (full) position.
- Step 5 – Test: Restore power and run the unit. If E471 returns, the drain pump or float switch assembly may need replacement by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Drain Pump Assembly
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