H99

Indoor Freeze Prevention Protection

Home Appliance Error Codes Panasonic Split AC

Can you still use it? With care until repaired

Who can fix it? Needs a technician

Typical repair time 30 minutes – 4 hours

Typical cost SAR 80 to 1,100

What it means

This code appears on Panasonic inverter split air conditioners and is read from the fault history with the CHECK button. It means the indoor coil sensor saw a temperature low enough to freeze water on the coil during cooling or dry mode, so the unit paused the compressor until the coil warmed up. The unit usually resumes by itself, but repeated codes point to a cause that needs fixing; the same number can mean something else 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.

Symptoms4

Cooling stops for short periods and then comes back.
Ice or frost on the indoor coil or on the pipe at the indoor unit.
Water leaking from the indoor unit after the ice melts.
Weak airflow or generally weak cooling.

Possible causes6

Clogged filters or a dirty coil reducing airflow.
Low refrigerant from a leak, common when cooling has faded over time.
Long periods on the lowest fan speed and lowest set temperature.
A weak indoor fan motor.
A partial blockage in the electronic expansion valve or piping.
A wrong reading from the indoor coil sensor.

How to diagnose5

Switch off the power and clean the filters; if the coil is iced, let it melt fully before restarting.
Run the unit on high fan speed and a moderate set temperature and see whether the stops repeat.
The technician measures refrigerant pressure and pipe temperatures against the manufacturer specification and looks for a leak.
The technician checks coil cleanliness and fan motor speed.
The technician checks the coil sensor and expansion valve if everything above is fine.

How to fix5

Clean the filters and restart after the ice has melted.
Have the indoor coil and fan fully cleaned.
Repair the leak and recharge refrigerant by weight; this is work for a licensed technician.
Replace the fan motor or coil sensor if proven faulty.
Clear any expansion valve or pipe blockage, then confirm the code does not return in the history.

Repair cost

0–200

200–600

600–1,500

1,500+

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

The cost is low when cleaning the filters and coil fixes it, and higher when a refrigerant leak must be repaired and the system recharged.

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

Can I keep using the unit?

Yes, carefully, after cleaning the filters. If the stops repeat or you see ice on the pipes, switch it off and have the refrigerant checked.

Why does water drip from the indoor unit with this code?

Ice on the coil melts when the compressor pauses, and the water can be more than the drain pan handles at once.

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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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