Indoor Intake Air Temperature Sensor Abnormality

What it means

This code appears on Panasonic inverter split air conditioners when the fault history is read with the CHECK button. It means the board reads an impossible value from the indoor intake air temperature sensor, which points to an open or shorted circuit; this sensor measures the room air entering the indoor unit and decides when the room has reached the set temperature. Depending on the model, the unit stops or runs with limited control until the fault is repaired. The same number can mean a different fault 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: H23H27H28H15

Symptoms4

• A lamp blinks on the indoor unit and cooling stops or weakens.
• The unit runs and then stops shortly after starting.
• The unit does not respond properly to changes in the set temperature.
• The code returns after a restart.

Possible causes5

• A loose or unplugged indoor intake air temperature sensor connector on the board.
• A failed indoor intake air temperature sensor whose resistance no longer matches the manufacturer table.
• A cut or chafed sensor wire from heat, rubbing or rodents.
• Moisture or corrosion at the connector from condensation inside the indoor unit.
• A fault in the sensor input circuit on the board (less common).

How to diagnose5

1. Switch the unit off at the breaker for a few minutes, restart it and see whether the code returns.
2. With power off, the technician inspects the sensor behind the front panel near the air intake, its wire and its connector on the board.
3. The technician measures the sensor resistance at the current temperature and compares it with the manufacturer table.
4. The technician checks the wire along its length for breaks or shorts.
5. If the sensor and wire are good, the technician checks the input circuit on the board.

How to fix5

1. Restart the unit after a power-off; a one-off glitch may clear.
2. Reseat the sensor connector and clean its pins.
3. Repair or replace a damaged sensor wire.
4. Replace the indoor intake air temperature sensor with a part that matches the model.
5. Repair or replace the board if the input circuit is faulty, then run the unit and confirm the code does not return.

Repair cost

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

The cost stays low when reseating the connector or replacing the sensor fixes it, and rises when the board has to 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