Mini-split error code lookup

How the error code lookup works

Every mini-split brand uses its own set of fault codes, so a code that means one thing on a Daikin can mean something completely different on a Samsung. This tool skips the guesswork and the generic charts: it reads the specific code table for your brand and gives you the answer in three steps.

1. Choose your brand from the dropdown - type to filter or scroll the list.
2. Enter the code exactly as it appears on the indoor head, the remote, or as a blinking-light pattern. Capitalization and spacing do not matter - "E 4", "e4", and "error 4" all resolve to the same code.
3. Read the diagnosis - the meaning, how urgent it is, the safe steps to try, the part or repair you likely need, and when to call a professional.

Where to find your error code

Depending on the unit, the code shows up in one of a few places:

• On the indoor unit display - the clearest source: a short code like E4, P1, C462, or 62.3.
• On the remote or wall controller - many brands flash the code on the remote's screen when you hold a diagnostic button.
• As a blinking-light pattern - units without a display blink the code out. Count the flashes: a light that blinks three times, pauses, then repeats is a "3-blink" code, and the operation and timer lights blinking together usually mean a different fault than either one alone. A slow, steady blink is often just defrost or start-up.
• On the outdoor unit's board - some brands display a diagnostic code on the outdoor control board, sometimes after a button press.
• In the app - newer Wi-Fi-connected units surface the code in the manufacturer's app.

What mini-split error codes mean

The exact letter-and-number scheme differs by manufacturer, but across every brand the faults fall into a handful of families:

• Communication errors - the indoor and outdoor units are not talking to each other (wiring, connections, or a control board).
• Sensor faults - a temperature sensor (room, coil, discharge, or ambient) is disconnected or reading out of range.
• Refrigerant and leak codes - low charge or a detected leak. On modern R-32 and R-454B systems this refrigerant is A2L (mildly flammable), so these codes are safety-critical.
• Electrical and inverter faults - voltage, current, the IPM or PFC power module, or compressor-drive protection.
• Protection modes - the system limiting or stopping itself because of high pressure, overheating, freeze-up, or running outside its temperature range. Some of these clear on their own once conditions improve.

First things to try, safely

Before you call anyone, a few homeowner-safe steps clear a surprising number of codes:

1. Power-cycle the system - turn it off at the breaker for five minutes, then back on. This resets transient faults.
2. Clean the filters - a clogged filter triggers airflow, freeze-up, and overheating codes. Rinse the washable filters, dry them, and reinstall.
3. Clear the airflow path - make sure nothing blocks the indoor return or supply, or the outdoor unit (leaves, snow, debris). Leave the panels on.
4. Let it thaw - if the outdoor coil is iced up, give it an hour before restarting.

Restart once. If the code comes back, stop - a code that returns after a reset is pointing at real hardware, and the diagnosis above will tell you whether it is a part you can buy or a job for a technician.

When to call a professional

You can safely handle resets, filters, airflow, and simple user-replaceable parts. Do not open the sealed refrigerant system, remove electrical panels, or work on boards, sensors, capacitors, fan motors, or the compressor - those are professional repairs.

One code type overrides everything else: a refrigerant-leak code. Today's mini-splits use A2L refrigerants (R-32, R-454B) that are mildly flammable. If your diagnosis says stop-use, turn the system off, ventilate the room, keep flames, sparks, and smoking away, and call a licensed HVAC technician before running it again.

Error codes by brand

Prefer to browse? Open the full, source-backed code guide for your brand - every code with its meaning, urgency, and fix:

• Mitsubishi Electric error codes73
• Daikin error codes61
• Della error codes60
• GREE error codes57
• Pioneer error codes57
• Panasonic error codes56
• Klimaire error codes51
• LG error codes51
• Samsung error codes51
• Senville error codes51
• MRCOOL error codes50
• Toshiba Carrier error codes49
• ACiQ error codes44
• Midea error codes44
• Fujitsu error codes36
• Friedrich error codes35
• Carrier error codes33
• GE Appliances error codes30
• Bosch error codes18
• Cosmo error codes14
• TOSOT error codes14
• Trane error codes10
• Blueridge error codes7
• Cooper & Hunter error codes6
• Haier error codes3
• Goodman error codes0
• Perfect Aire error codes0

More brands are added regularly. Browse all error-code guides.

Mini-split error code FAQ

Why is my mini-split blinking a light or showing a code?

A blinking light or on-screen code is how a mini-split reports a fault. Units with a digital display show a short code like E4, P1, or C462; units without a display blink the code out on the indoor unit's LEDs. A slow, steady blink is usually just defrost or start-up, not a fault - but rapid flashing, or the operation and timer lights blinking together, is a specific error. Look the code up above to see what it means.

How do I find and read my mini-split error code?

Check the indoor unit's display, the handheld remote or wall controller (some brands flash the code when you hold a diagnostic button), or count the blinking LEDs on the indoor head - a light that flashes three times, pauses, then repeats is a '3-blink' code. Newer Wi-Fi units also show the code in the manufacturer's app. Write it down exactly, then enter it in the tool above.

How do I clear a mini-split error code?

Turn the system off at the breaker for five minutes and then back on, and clean the washable filters - a transient code or an airflow-related code often clears on its own. If the same code returns after one reset, it is pointing at real hardware and needs the specific fix shown in the diagnosis.

Are mini-split error codes dangerous?

Most codes point to a part that needs service, not an immediate hazard. The exception is a refrigerant-leak code. Today's mini-splits use A2L refrigerants (R-32 and R-454B) that are mildly flammable, so a leak code is treated as stop-use: turn the system off, ventilate the room, keep flames and sparks away, and call a licensed technician. The tool flags these clearly.

Can I fix a mini-split error code myself?

Some. Resets, filter cleaning, clearing blocked airflow, and simple user-replaceable parts (filters, remote batteries) are homeowner-safe. Sensor, control-board, compressor, capacitor, fan-motor, and refrigerant faults are professional repairs - never open the sealed refrigerant system or electrical panels. The diagnosis tells you which path your code falls under.

Do all mini-split brands use the same error codes?

No. Each manufacturer uses its own scheme - a Daikin U0, a Samsung C462, a Midea EH03, and a Fujitsu 62.3 all mean different things - and codes can even differ between model generations of the same brand. That is exactly why this lookup is brand-specific rather than a single universal chart.