Er
Costway
General Control Board or Firmware Error
Display shows Er or flashes all segments; controls may be unresponsive.
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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
Corrupted control firmware, Internal control board failure, Voltage spike or surge damage, Loose internal connectors
How to Fix / Troubleshooting
Safety: Unplug the cooler before opening any panels.
Steps:
- Hard reset: Unplug the unit for at least 15 minutes to fully discharge the control board. Plug back in and see if Er clears.
- Inspect internal connections: Remove the rear or top panel to access the main control board. Reseat all connectors (sensors, fans, display, power).
- Check for visible damage: Look for burned components, bulging capacitors, or cracked solder joints. If present, replace the control board.
- Surge protection: After replacement, use a quality surge protector to prevent future damage.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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