Outdoor DC Peak Detection

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 detected a sharp instantaneous spike in the DC current flowing through the power module (IPM) to the compressor, a sign of a short circuit or a severe sudden load. The unit stops the compressor immediately to protect the board and locks out if the code repeats several times. 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: F93F96F98F90

Symptoms4

• The unit stops suddenly seconds or minutes after the compressor starts.
• The breaker may trip at the same time.
• A crackling sound or burning smell from the outdoor unit in some cases.
• The code returns immediately after a restart.

Possible causes5

• A failed power module (IPM) on the inverter board.
• A short or insulation leak in the compressor windings.
• Burnt compressor wires or wires touching the unit frame.
• A mechanically seized compressor drawing very high current at start.
• Voltage surges or a lightning strike.

How to diagnose5

1. Switch off at the breaker and do not restart more than once.
2. Note whether the breaker tripped or there was a burning smell, and tell the technician.
3. After discharging the board, the technician checks the compressor wires and terminals.
4. The technician measures compressor winding resistance and insulation to the frame against the manufacturer specification.
5. The technician tests the power module on the board using the service manual.

How to fix5

1. Keep the unit off and call a technician qualified on inverter boards.
2. Repair or replace burnt compressor wires or wires touching the frame.
3. Replace the inverter board at an authorized service center if the power module has failed.
4. Replace the compressor if its windings are shorted or it is seized, because a new board fitted to it would fail again.
5. Fit a voltage protector, then confirm 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 burnt wiring, 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