Compressor Sensor System Abnormality

What it means

This code appears on Daikin inverter split, ducted and cassette air conditioners and means the outdoor board could not read the voltage or current signals it needs to drive the compressor properly when trying to start. The unit stops without running the compressor, and 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: H6H8E6L5

Symptoms3

• The outdoor unit does not start the compressor and H0 appears.
• The outdoor fan may run briefly, then everything stops.
• No cooling, and the code returns on every start attempt.

Possible causes4

• Loose, disconnected or burnt compressor wiring at the terminals.
• Unstable or low supply voltage.
• A faulty voltage or current detection circuit on the outdoor PCB.
• A compressor winding fault, which is the least common cause.

How to diagnose5

1. Switch the unit off at the breaker for several minutes, then restart.
2. Check that the supply voltage is stable.
3. A technician checks the compressor wiring at the board and at the compressor terminals after discharging the inverter board.
4. The technician measures the compressor windings against Daikin specifications.
5. If the wiring and compressor are good, the outdoor board is judged faulty per the service manual.

How to fix5

1. Reseat the compressor wiring or repair burnt terminals.
2. Fix the voltage problem or fit a suitable voltage protector.
3. Replace the outdoor PCB if its detection circuit is proven faulty.
4. If the compressor is proven faulty, refer the unit to an authorized center to assess replacement.
5. Run and test the unit under load 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, while the outdoor inverter board is the most expensive likely cause of this code.

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