Daikin Mini Split Error Codes
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Featured codes
- E5 — E5 means the compressor has overloaded or, on some models, the high-pressure switch i
- L5 — L5 means the inverter output current is abnormal - an instantaneous overcurrent was d
- U0 — U0 means the system is seeing signs of refrigerant shortage or pressure drop. On curr
- U4 — U4 means the indoor and outdoor units are not communicating reliably, so the system s
- E1 — E1 means an outdoor unit PCB abnormality on Daikin systems (splits, SkyAir, VRV): the
- E3 — E3 means actuation (opening) of the high-pressure switch or abnormal high-pressure de
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Safe checks with an external tool or supply
These pages list the check you can do from outside the unit, with an optional external tool or maintenance supply. None of them repair an internal fault.
Related troubleshooting guides
Manufacturer manuals
- Daikin FVXS09NVJU service manual p180 - 7.6 Outdoor Unit PCB Abnormality (E1): causes and troubleshooting
- Daikin FFQ15Q2VJU service manual p84 - 4.18 Input Overcurrent Detection Error Code E8
- Daikin FVXS18NVJU service manual p173 - 7.10 Input Overcurrent Detection Error Code E8
- Daikin L3 error code - SplitAtlas (AURORA R-32 manual-aligned)
- Daikin L4 error code - SplitAtlas (AURORA R-32 manual-aligned)
- Daikin L6 error code - SplitAtlas (AURORA R-32 manual-aligned)
- Daikin L8 error code - SplitAtlas (AURORA R-32 manual-aligned)
- Daikin L9 error code - SplitAtlas (AURORA R-32 manual-aligned)
E codes
- Daikin E1 error code
Daikin E1 means an outdoor unit PCB abnormality: the outdoor control board's microcomputer is running abnormally (program fault or lost zero-cross sig… - Daikin E3 error code
Daikin E3 means high-pressure protection: the high-pressure switch opened or the pressure circuit was judged abnormal. Clean filters and clear the out… - Daikin E5 error code
E5 on Daikin mini splits means the compressor has overloaded or, on some models, the high-pressure switch tripped. Clean filters and outdoor airflow, … - Daikin E6 error code
E6 on a Daikin mini split means the compressor could not start or keep rotating. One reset is safe; a returning E6 means locked-rotor or inverter work… - Daikin E7 error code
Daikin E7 means an outdoor fan motor fault: the outdoor fan is stopped, locked, stalling, or not reporting rotation. Power off and (from outside the g… - Daikin E8 error code
Daikin E8 means input overcurrent: the outdoor unit detected AC input (or inverter compressor) current outside the allowed range and shut down. Note a… - Daikin E9 error code
Daikin E9 means a malfunction of the electronic expansion valve (EEV) coil or its drive circuit - the valve that meters refrigerant is not operating n…
F codes
- Daikin F3 error code
Daikin F3 means discharge pipe temperature abnormality: the compressor discharge line got hotter than the safe limit, so the unit limited or stopped o… - Daikin F6 error code
Daikin F6 means abnormally high refrigerant pressure (commonly refrigerant overcharge) detected in cooling mode, so the system limited or stopped cool… - Daikin F8 error code
F8 on a Daikin mini split means the compressor got too hot internally (or the system thinks it did). Clean filters and airflow, reset once; a returnin…
H codes
- Daikin H0 error code
Daikin H0 is a compressor sensor-system abnormality. The only homeowner step is one reset after checking connectors are seated; sensor and board diagn… - Daikin H3 error code
Daikin H3 is a high-pressure switch/sensor circuit abnormality, not an overpressure trip. No safe DIY repair - switch and refrigerant-circuit work is … - Daikin H6 error code
H6 on a Daikin mini split means the inverter cannot read compressor rotor position. One reset is safe; a returning H6 means compressor or inverter wor… - Daikin H7 error code
Daikin H7 is an outdoor fan motor signal/feedback abnormality. Safe checks: clear debris around the outdoor fan and reset once. Fan motor, wiring, and… - Daikin H8 error code
Daikin H8 is a compressor input (CT) current-measurement abnormality. One reset is safe; CT, wiring, and inverter-board work is technician-only. Do no… - Daikin H9 error code
Daikin H9 is an outdoor air temperature sensor fault. Safe steps: reset once after a power off; recurring H9 needs sensor resistance testing - technic…
L codes
- Daikin L0 error code
Daikin L0 is an outdoor inverter system malfunction. One reset attempt is safe; inverter-board diagnosis involves lethal DC voltage and is technician-… - Daikin L3 error code
L3 means the outdoor electrical (compo Clean filters and outdoor clearance, power cycle once, and call a technician if the code returns..… - Daikin L4 error code
L4 means the inverter radiation-fin (heat sink) temperature has risen too high - the inverter heat sink cannot shed its heat, so the unit limits or st… - Daikin L5 error code
L5 on Daikin mini splits means the inverter output current to the compressor is abnormal (output overcurrent / IPM abnormality). Power down for severa… - Daikin L6 error code
L6 means the inverter detected an instantaneous overcurrent on its AC output to the compressor - the compressor current spiked beyond limits Clean fil… - Daikin L8 error code
L8 means overcurrent in the inverter compressor - the compressor drew more current than the inverter allows, so it stopped to protect the circuit Clea… - Daikin L9 error code
L9 means inverter compressor startup error with stall prevention - the compressor could not start or reach speed, so the inverter stopped trying to pr…
P codes
- Daikin P1 error code
Daikin P1 is power voltage imbalance / inverter-PCB power input abnormality. Safe steps: note outages or storm damage and reset once. Electrical servi… - Daikin P4 error code
P4 means the inverter heat-sink (radiation fin) temperature sensor is reading invalid, so the outdoor unit stops to protect the inverter. One safe pow…
U codes
- Daikin U0 error code
U0 on Daikin mini splits means refrigerant shortage or pressure drop is detected. On current R-32 systems treat it as a possible leak: stop operation,… - Daikin U1 error code
U1 means reverse phase or open phase on the outdoor power supply - the three-phase (or detected phase) wiring is wrong or a phase is missing, so the u… - Daikin U2 error code
Daikin U2 means a power supply voltage defect: incoming voltage is out of range, a phase is open, or a momentary power failure occurred. Check nothing… - Daikin U4 error code
U4 on Daikin mini splits means the indoor and outdoor units are not communicating reliably. It is almost never a refrigerant problem - the cause is us… - Daikin U5 error code
U5 means transmission between the indoor unit and the remote controller has failed. Check the wiring between the units/controls and power cycle once; … - Daikin U6 error code
U6 means transmission between indoor units (in multi-unit groups) has failed. Check the wiring between the units/controls and power cycle once; if the… - Daikin U7 error code
U7 on a Daikin mini split means the outdoor control boards (or outdoor units on multi systems) are not exchanging signals. Reset once; a returning U7 … - Daikin U8 error code
U8 means transmission between remote controllers (main-sub wired controllers) has failed. Check the wiring between the units/controls and power cycle … - Daikin U9 error code
U9 on a Daikin mini split means one indoor, BEV, BS, or outdoor unit in the system is not communicating. Match modes and reset once; a returning U9 ne…