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Carrier Air Conditioner 71 / 72 / 81 / 82 Error Code

Compressor thermal cutout or lockout on Carrier air conditioners.

CarrierAll Carrier air conditioner codes

71 / 72 / 81 / 82
May need a pro

The board saw the compressor start and then lose power partway through a run. Carrier blames the compressor's internal overload tripping, or on units with a hard-start kit, a start relay or capacitor staying in the circuit too long. Codes 71 and 72 mark a single cutout on low or high stage; 81 and 82 mean it happened three cycles running and that stage is locked out.

Compatible models

Two-stage compressors in Infinity 24ANB7 air conditioners and 25HNB6/25HNB9 heat pumps.

Also shown as

The lockout codes clear after 4 hours or a 24-volt power cycle. An overheated compressor can take a long while to cool down and reset its own overload.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

Not sure you are reading the code right? See how to read Carrier air conditioner codes.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Carrier 71 / 72 / 81 / 82

  1. Check outdoor airflow

    Turn off the power, then clear anything crowding the outdoor coil. A smothered coil makes the compressor run hot.

  2. Let it rest before restarting

    Leave the system off for an hour or more. Restarting a hot compressor over and over adds wear without fixing the cause.

When to call a technician

Repeated thermal codes call for a technician to check the capacitor, start components, voltage and refrigerant charge. Don't keep resetting the lockout.

Parts linked to 71 / 72 / 81 / 82

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

Order parts by your full model number so they fit.

Frequently asked questions

Which Carrier models show the 71 / 72 / 81 / 82 code?

Two-stage compressors in Infinity 24ANB7 air conditioners and 25HNB6/25HNB9 heat pumps.

Can I fix Carrier 71 / 72 / 81 / 82 myself?

Only the basic checks. You can safely try the steps above, but 71 / 72 / 81 / 82 usually points to a part or fault that needs a technician.

Other Carrier air conditioner codes

Last reviewed 2026-10-22. Codes and steps can vary by model; check your owner's manual.

Sources we checked