Compressor Lock

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 compressor did not turn even though power was sent to it, so the board treats it as locked. The outdoor unit stops and retries several times, and the fault locks in if the compressor still will not turn. 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: 1F1C1614

Symptoms4

• Humming or clicking from the outdoor unit without the compressor running.
• The indoor unit lamps blink and code 1D is found on check.
• No cooling, with the outdoor unit stopping after each attempt.
• The fault appears after a long shutdown or a voltage drop.

Possible causes6

• Low or fluctuating supply voltage at start-up.
• Liquid refrigerant collected in the compressor after a long shutdown, making starting hard.
• A closed service valve or unequal pressures at start-up.
• Loose or wrongly ordered compressor leads.
• An inverter board fault preventing correct compressor drive.
• A mechanically seized compressor from wear or oil shortage.

How to diagnose6

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. Turn the unit off at the breaker and do not restart it again and again, as this can add damage.
3. Note whether the fault followed a long shutdown or a power dip, and tell the technician.
4. Switch off at the breaker before opening any panel; the outdoor unit and its inverter board keep a dangerous charge for a while after switch-off.
5. The technician measures voltage at start-up and checks the service valves are open and the compressor leads are sound and in order.
6. The technician tests the compressor windings and the inverter board, then decides whether the compressor is truly seized or the board is not driving it.

How to fix5

1. Fix the low voltage problem and fit a voltage protector.
2. Open the service valves fully and correct the compressor wiring.
3. Replace the inverter board if it is proven to be the cause.
4. Replace the compressor if it is mechanically seized, with evacuation and recharge by a licensed technician.
5. Run the unit, monitor start-up and current, and 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 voltage or wiring causes, rises for an inverter board, and is highest if the compressor is truly seized and 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