Electronic Expansion Valve Abnormality

What it means

This code appears on Daikin air conditioners, most often on SkyAir ducted and cassette units, and means the board has detected a fault in the electronic expansion valve that meters refrigerant into the evaporator, either in its electrical coil or in its movement. The unit stops because refrigerant control can no longer be trusted. 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: F3U0E4J3

Symptoms4

• The unit stops and E9 appears.
• Weak or fluctuating cooling before the code.
• Frost on certain pipes or an unusually hot discharge line.
• On some models, the usual soft clicking of the valve at startup is missing.

Possible causes5

• A loose or corroded valve coil connector on the board.
• A failed valve coil, or a coil that has come off the valve body.
• A valve body stuck from dirt or moisture in the refrigerant circuit.
• A cut or chewed coil wire.
• A faulty valve drive circuit on the board.

How to diagnose5

1. Switch the unit off at the breaker for a few minutes, then restart.
2. A technician confirms the valve coil is seated on the body and its connector is good.
3. The technician measures the coil resistance and compares it with Daikin specifications.
4. The technician watches the valve operate at restart and checks pipe temperatures before and after it.
5. If the coil is good and the valve does not move, the board output is checked or the valve body is condemned.

How to fix5

1. Reseat the valve coil and its connector.
2. Repair the damaged wire or replace the valve coil.
3. A licensed technician replaces a stuck valve body, recovering the refrigerant, evacuating and recharging.
4. Replace the board if its valve drive circuit is proven faulty.
5. Run the unit, check pressures and temperatures, and confirm the code does not return.

Repair cost

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

A new coil or a connector repair is relatively cheap, a valve body replacement needs refrigerant work, and the top of the range applies when the board is the cause.

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