Compressor Rotation Failure

What it means

This code appears on Panasonic inverter split air conditioners and is read from the fault history with the CHECK button on the remote. It means the inverter board tried to start the compressor but could not detect correct rotation, either because the compressor did not start turning or because it turned irregularly. The unit stops the compressor and retries, and may lock out after several attempts. The same number can mean something different on other brands.

Models covered: Panasonic residential inverter split air conditioners (wall mounted); the code is read with the CHECK button on the remote control.

Related codes: F99F98F96H16

Symptoms4

• The outdoor unit hums or clicks but the compressor does not run.
• The outdoor fan runs but there is no cooling.
• The unit stops after repeated start attempts and a lamp blinks on the indoor unit.
• The unit may work after a restart and then show the code again.

Possible causes5

• Loose or burnt compressor wires between the board and the compressor.
• Low supply voltage at start-up.
• A fault in the power module (IPM) or drive circuit on the inverter board.
• A restart before pressures have equalized after a short power cut.
• A mechanically seized compressor or damaged windings.

How to diagnose5

1. Switch off at the breaker for at least ten minutes, then restart once.
2. Note whether the fault follows low voltage or a power cut.
3. After discharging the board, the technician checks the compressor terminals and wires.
4. The technician measures winding resistance and insulation and compares them with the manufacturer specification.
5. The technician tests the inverter board output to the compressor using the service manual to tell a board fault from a compressor fault.

How to fix5

1. Wait before restarting after a power cut, and fit a voltage protector if the supply is weak.
2. Repair or replace burnt compressor wires and terminals.
3. Replace the inverter board at an authorized service center if the power module is faulty.
4. Replace the compressor if it is seized or its windings are damaged, with evacuation and recharge.
5. Run the unit, confirm the compressor starts smoothly and the code does not return.

Repair cost

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

The cost is low for wiring or weak voltage, much higher for a new inverter board, and reaches the top of the range when the inverter compressor must be replaced.

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