Inverter Output Overcurrent

What it means

This code appears on Daikin inverter split, ducted and cassette air conditioners and means the outdoor board detected a sudden, very high current at the inverter output feeding the compressor and cut operation at once to protect the power module (IPM) and compressor. A repeating code usually points to the compressor, its wiring or the board. The same code can mean something else on other brands.

Models covered: Daikin split air conditioners and Daikin ducted/cassette (SkyAir) units, which share the same error code system; the code shows on the wired remote or via the wireless remote check function.

Related codes: E6H6L4H8

Symptoms4

• The compressor stops suddenly and L5 appears, sometimes right at startup.
• No cooling, and the code returns on every attempt.
• Sometimes a hum or clicking from the outdoor unit.
• The breaker may trip in some cases.

Possible causes6

• Loose, burnt or shorted compressor wiring.
• Poor compressor winding insulation or a short between windings.
• A faulty power module (IPM) on the outdoor board.
• Compressor overload from high pressure, a closed service valve or a seized compressor.
• Supply voltage fluctuations.
• Moisture or insects inside the outdoor board.

How to diagnose5

1. Switch the unit off at the breaker for at least ten minutes, then restart only once.
2. Make sure the outdoor unit is clean and the supply voltage is stable.
3. A technician checks the compressor wiring and terminals after discharging the inverter board.
4. The technician measures compressor winding resistance and insulation against Daikin specifications.
5. The technician tests the power module and board output per the service manual and checks system pressures and service valves.

How to fix5

1. Repair burnt or loose compressor wiring.
2. Fix the voltage problem or fit a suitable voltage protector.
3. Wash the outdoor unit and open the service valves fully if high pressure caused the overload.
4. Replace the outdoor PCB if the power module is proven faulty.
5. Replace the compressor if its windings are shorted or poorly insulated, then test the unit and confirm the code does not return.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

Wiring repairs are cheap and the outdoor board is expensive, while shorted compressor windings require a new inverter compressor, the top of the range.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions