Room Temperature Sensor Error

What it means

This code appears on Toshiba residential split air conditioners when the fault code is read with the remote check function. It means the indoor board is getting an impossible reading from the room temperature thermistor (TA), due to an open or short in the sensor or its lead. The unit stops or runs incorrectly because it does not know the real room temperature. The same code can mean something else on other brands, and Toshiba commercial units use different codes.

Models covered: Toshiba residential split air conditioners (RAC) that show a two-character check code through the remote check function; Toshiba commercial units use different codes.

Related codes: 0D1219

Symptoms4

• The unit stops and the indoor unit lamps blink.
• Code 0C is found with the remote check function.
• Nonstop cooling, or early shut-off before the room reaches the set temperature.
• The fault appears after the indoor unit was cleaned or opened.

Possible causes5

• A loose or unplugged sensor connector on the control board.
• The thermistor itself has failed with age.
• The sensor lead was cut or pinched when the cover was refitted.
• Moisture or water on the connector after the indoor unit was washed.
• A fault in the sensor input circuit on the indoor board.

How to diagnose5

1. Read the code with the remote check function: press and hold the check button, then step through the codes with the timer button until the indoor unit beeps continuously; the code shown then is the fault. Steps vary slightly by remote, so follow the owner's manual.
2. Switch off at the breaker for a few minutes, restart and see whether the fault returns.
3. Note whether the indoor unit was washed recently, which points to a wet or unplugged connector.
4. With power off, the technician checks the sensor connector on the board and the lead.
5. The technician measures the sensor resistance against the manufacturer table at room temperature, then checks the board if the sensor is good.

How to fix5

1. Dry and reseat the connector.
2. Repair a damaged sensor lead.
3. Replace the room thermistor with the correct part for the model.
4. Replace the indoor control board if proven faulty.
5. Run the unit and confirm it cycles with the set temperature and the code is gone.

Repair cost

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

The cost is low for a connector or thermistor, and rises if the indoor unit needs a new control board.

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