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Air Conditioners & Heat Pumps Error Codes & Troubleshooting

Mini-splits, multi-splits, VRV/VRF, central HVAC. Select a brand or search below for instant fault code diagnosis, sensor readings, and reset procedures.

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Common Air Conditioners & Heat Pumps Error Codes

U4 Medium

Daikin

Daikin Error Code U4 - Transmission Error Between Indoor and Outdoor Units

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E7 Medium

Daikin

Daikin Error Code E7 - Outdoor DC Fan Motor Lock

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EC / E1 High

Midea

Midea AC Error Code EC (or E1) - Refrigerant Leakage Detection

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