Arcoaire mini split error code P6
2 meanings on Arcoaire, depending on which series you have. Check the model number on the indoor unit's label.
If yours is a DLC/DLF series, 2015 and later (Midea-built) unit
Outdoor low pressure protection.
- TypeProtection
- SystemRefrigerant circuit
- Can I fix it?Homeowner checks, then maybe a tech
What P6 means on a Arcoaire
Suction pressure dropped below the safe limit, which usually means the refrigerant charge is low or the flow is restricted. The compressor stops to avoid running dry.
On this platform, P6 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- Low refrigerant charge from a leak or an incomplete charge at installation.
- A service valve not fully open, or a kinked line set.
- A badly iced or blocked indoor coil in cooling mode (frozen coil).
- A failed low-pressure switch or sensor.
How to fix it yourself
Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician.
- Confirm both service valves are fully open.
- Pull the front panel and check the filters and the indoor coil. Dirty filters and a matted coil restrict airflow, and airflow problems trigger a surprising number of protection codes.
- If the indoor coil is iced over, leave the unit in Fan-only mode until it thaws, then retry.
- Leak-check the flare joints (see EC).
- Anything inside the refrigerant circuit (sensors are fine, but valves, compressors and leaks are not) needs EPA-certified refrigerant handling. That is a technician job.
Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.
When to call a technician
A technician must measure the charge with gauges. Do not add refrigerant without finding and fixing the leak.
If yours is a DLC4 / DLF4 series, 2013 to 2015 (Gree-built) unit
Communication error between inverter drive and main controller.
- TypeFault
- SystemCommunication
- Can I fix it?Technician job
What P6 means on a Arcoaire
The compressor drive board and the outdoor main board stopped talking to each other.
On this platform, P6 is a fault: something has failed or is disconnected and needs diagnosis.
Common causes
- A loose connector between the boards.
- A failed drive or main board.
How to fix it yourself
Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.
- Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.
- With power off, reseat the connectors between the outdoor boards.
Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.
When to call a technician
Board-level fault.
Which Arcoaire units show P6
Arcoaire sells DLCSRA / DLCSRB / DLCLRA outdoor with DLFSHA / DLFSFA indoor (2015 and later) and DLC4 / DLF4 (2013 to 2015) units, and this code carries more than one meaning across them: on the DLC/DLF series, 2015 and later (Midea-built), P6 means outdoor low pressure protection; on the DLC4 / DLF4 series, 2013 to 2015 (Gree-built), P6 means communication error between inverter drive and main controller. The model number on the indoor unit's label, and which display you are reading, tell you which applies.
Where Arcoaire shows this code
DLC/DLF series, 2015 and later (Midea-built): The code appears on the indoor unit's LED display in place of the set temperature. Some models also blink the indicator lamps in a pattern that matches the code. E codes are faults in the indoor unit or its communication link, F codes are faults on the outdoor side, and P codes are protections: the outdoor unit has stopped itself to prevent damage. EC is the refrigerant leak check.
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): The code shows on the indoor unit's display in place of the temperature. If the display is off, press the Light button on the remote. Some models also count out the code as indicator blinks. E codes are system protections and faults, F codes are mostly sensor faults, H codes are outdoor and compressor protections, U codes are motor and valve faults, and P codes are power-supply faults.
Other Arcoaire codes
Same part of the system as P6:
P6 on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- Pioneer P6 Outdoor low pressure protection / Inverter module (IPM) malfunction (outdoor display)
- Blueridge P6 Communication error between inverter drive and main controller / Outdoor low pressure protection
- Gree P6 Communication error between inverter drive and main controller
- Zone Air P6 Cooling mode overheating protection
- Mitsubishi Electric P6 Freeze protection (cooling) or overheat protection (heating)
- Carrier P6 Outdoor low pressure protection
- Trane P6 Cooling mode overheating protection / Freeze protection (cooling) or overheat protection (heating)
- Heil P6 Outdoor low pressure protection / Communication error between inverter drive and main controller
- ACiQ P6 Outdoor low pressure protection / Cooling mode overheating protection
Questions people ask
Why does P6 have more than one meaning on a Arcoaire?
Arcoaire sells units built on more than one control platform, and each platform has its own code table. The model number on the indoor unit's label tells you which series you have: DLC/DLF series, 2015 and later (Midea-built) units read P6 as outdoor low pressure protection; DLC4 / DLF4 series, 2013 to 2015 (Gree-built) units read P6 as communication error between inverter drive and main controller.
Can I reset a Arcoaire P6 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If P6 comes back, the fault is real and needs the checks above.
Is it safe to keep running a Arcoaire showing P6?
Not repeatedly. A protection code means the unit stopped itself to prevent damage, and resetting it over and over can turn a cheap repair into a compressor failure. Reset once, check the basics, and stop if it returns.
Sources
- ICP DLCSRA Outdoor Unit Single Zone Ductless Service Manual 32808000801 (error code table)
- ICP ductless installation instructions IM-KSAIC04-04 (DLCPRA / DLCSRB / DLCERB / DLCLRA error codes)
- ICP R-410A Ductless Split System Service Manual 421 01 9204 00 (DLC4 / DLF4, 2013)
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.