DIY HVAC Tools

Gree mini split error code E3

Low pressure protection (refrigerant shortage or blockage).

  • TypeProtection
  • SystemRefrigerant circuit
  • Can I fix it?Homeowner checks, then maybe a tech

What E3 means on a Gree

Suction pressure fell below the limit. Usually low refrigerant charge, a valve left closed, or a restriction. The compressor stops to avoid running dry.

On this platform, E3 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 charge from a leak or an incomplete installation charge.
  • A service valve not fully open.
  • A kinked or restricted line set.
  • A frozen indoor coil in cooling mode.
  • A failed low-pressure switch.

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.

  1. Open both service valves fully.
  2. 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.
  3. If the indoor coil is iced, run Fan-only until it thaws.
  4. Leak-check every flare joint with soapy water while the system runs.
  5. 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 and find the leak before adding refrigerant.

Which Gree units show E3

This page applies to Gree Livo, Vireo, Sapphire, Crown, Multi21 and Flexx units. Gree's own documentation lists E3 as "Low pressure protection (refrigerant shortage or blockage)", the same definition used across the Gree platform it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.

Where Gree shows this code

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 Gree codes

Same part of the system as E3:

E1High pressure protectionE2Indoor anti-freeze protectionE8High temperature protection (overheating)F0Refrigerant shortage or system blockage detectedF6Overload frequency limiting (protection)FHAnti-freeze frequency limiting (protection)H4System overload protectionU7Four-way (reversing) valve fault
E4Compressor discharge temperature too highE5Over-current protectionE6Communication error between indoor and outdoor unitsE7Mode conflict (multi-zone)E9Indoor unit water-full (drain) protectionEEEEPROM (memory) error on a control boardFoRefrigerant recovery (pump-down) modeF1Indoor ambient (room) temperature sensor fault (open or short circuit)

All Gree error codes

E3 on other brands

The same characters do not always mean the same thing. Check the brand on your unit.

  • Pioneer E3 Indoor fan speed out of control (indoor fan motor fault) / Communication error between outdoor main board and IPM board (outdoor display)
  • Blueridge E3 Low pressure protection (refrigerant shortage or blockage) / Indoor fan speed out of control (indoor fan motor fault)
  • Tosot E3 Low pressure protection (refrigerant shortage or blockage)
  • Zone Air E3 Outdoor fan coil (condenser) temperature sensor fault (open or short circuit)
  • Daikin E3 High pressure protection (high-pressure switch)
  • Mitsubishi Electric E3 Remote controller signal transmitting error
  • Carrier E3 Indoor fan speed out of control (indoor fan motor fault)
  • Trane E3 Outdoor fan coil (condenser) temperature sensor fault (open or short circuit) / Remote controller signal transmitting error
  • Heil E3 Indoor fan speed out of control (indoor fan motor fault) / Low pressure protection (refrigerant shortage or blockage)
  • ACiQ E3 Indoor fan speed out of control (indoor fan motor fault) / Outdoor fan coil (condenser) temperature sensor fault (open or short circuit)

Questions people ask

Can I reset a Gree E3 code myself?

Yes. Turn the system off at the breaker for five minutes, then restart it. If E3 comes back, the fault is real and needs the checks above.

Is it safe to keep running a Gree showing E3?

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.

Do I need a technician for Gree E3?

Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician. A technician must measure the charge and find the leak before adding refrigerant.

Sources

  • Gree residential split service manuals (error code tables)

Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.