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William HillSep 6, 2025
What does Error Code E4 mean on my Acson A5MSY18BR?
- AAmy ThomasSep 6, 2025
If your Acson Air Conditioner is displaying Error Code E4, it indicates low pressure protection. Check the stop valve, low pressure sensor connection, low side pressure and voltage, outdoor coil sensor connection, sensor resistance value, and refrigerant level.