In brief

Fault code E1 on Gree Split / GMV means: Fault code E1 is a hardware safety: the gas pressure in the condenser is too high. The system shuts down to prevent explosion or mechanical damage. On a Gree heat pump or air conditioning unit, this fault is common in summer. Most common cause: Outdoor condenser fouled (dust/cotton), outdoor fan faulty, or too much refrigerant in the circuit. Same diagnosis for wall-mounted air conditioner or wall-mounted heat pump. First action: Clean the rear grille of the outdoor unit with a low-pressure water jet or a brush.. Call a registered engineer if the fault returns after basic checks or involves refrigerant work (F-Gas registered engineer required).

According to the Gree Flexx / GMV6 manual, the high-pressure threshold is 4.2 MPa (609 PSI) on some GMV models.

E1 • Gree • Split / GMV

Fault Code E1 Gree: High Pressure — Causes and Repair

Fault code E1 is a hardware safety: the gas pressure in the condenser is too high. The system shuts down to prevent explosion or mechanical damage. On a Gree heat pump or air conditioning unit, this fault is common in summer.

Source: Gree Outdoor Unit Troubleshooting · Updated on 8 June 2026

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What does fault code E1 on Gree mean?

Outdoor condenser fouled (dust/cotton), outdoor fan faulty, or too much refrigerant in the circuit. Same diagnosis for wall-mounted air conditioner or wall-mounted heat pump.

Symptômes

Compressor stops after a few minutes
Outdoor unit is very hot

Diagnostic

1. Clean the Heat Exchanger

Clean the rear grille of the outdoor unit with a low-pressure water jet or a brush.

2. Check the Fan

Verify that the outdoor fan spins quickly and expels heat effectively.

How to reset fault code E1 on Gree?

Clean the outdoor unit. If clean, have the refrigerant charge checked by a professional.

When should you call an F-Gas engineer?

The Gree E1 fault occurs mainly in summer in cooling mode, after 5-15 minutes of operation, when the outdoor condenser can no longer dissipate heat (cottonwood, dust, slow fan). Common on residential Split and GMV multisplit during heatwaves.

Affected models

Residential Split
GMV6 Ultra Heat
Flexx Eco R32
Multi21 Plus
Livo Gen4
U-Match Plus

Field context

Technical source data

According to the Gree Flexx / GMV6 manual, fault code E1 corresponds to high-pressure protection: the pressure switch opens if the pressure exceeds the threshold (reference 4.2 MPa / 609 PSI on some GMV models). Service procedure: check the pressure switch wiring, test the pressure switch, verify full opening of the gas/liquid valves, then clean the outdoor heat exchanger. Documented causes: refrigerant overcharge, poor heat exchange (fouled condenser), excessive ambient temperature.

Sources: flexx-service-manual-ac-bh.pdf (p. 27) · gmv6-ultra-heat-mini-heat-pump-service-manual.pdf (p. 40) · x-pac-r32-service-manual-a.pdf (p. 41)

Questions fréquentes

At what pressure does the Gree E1 fault trigger?

Gree manuals document a threshold around 4.2 MPa (609 PSI) on recent R32 ranges. The pressure switch cuts the compressor after 3 seconds of continuous opening.

Can the E1 fault disappear on its own after a reset?

Yes, on first occurrence if the pressure switch closes again, but the fault will return if the cause (dirty condenser, faulty fan, refrigerant overcharge) is not addressed.

Should the outdoor PCB be replaced for a Gree E1 fault?

No, not as a first step: check the pressure switch, wiring, valves and condenser cleanliness. The outdoor PCB is only replaced after mechanical causes have been eliminated.

Does this E1 code apply to Gree heat pumps?

Yes. On a wall-mounted heat pump or Gree air conditioner, E1 signals the same high-pressure protection. The diagnosis (condenser, fan, charge) remains identical.