Daikin HVAC Error Codes

Complete list of Daikin hvac error codes with causes, fixes, and OEM part numbers. 6 codes documented.

• A0 — Protection Device Fault
• A5 — Freeze Protection / Coil Icing
• C4 — Outdoor Heat Exchanger Thermistor Fault
• E1 — Indoor/Outdoor Communication Error
• E3 — High Discharge Pressure / High Pressure Switch Trip
• H9 — Outdoor Ambient Thermistor Error

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