Gree AC / Heat Pump Error E5 – Causes & Fix
E5: the Gree unit drew more current than allowed – often because supply voltage sagged – and stopped.
At a glance
Severity: Moderate
- Meaning
- Overcurrent Protection (Low or Unstable Voltage)
- Typical repair cost
- $0–$3,500
- DIY difficulty
- Moderate
Gree's code tables list E5 as overcurrent protection, on many inverter models tied to low-voltage conditions. The outdoor board measures the current the unit draws from the supply; if it goes over the limit, the unit stops and shows E5, then retries. Current rises for two broad reasons. Either the supply is weak – voltage sagging on a long or undersized circuit, a loose connection or a shared circuit – and the inverter pulls more amps to deliver the same power, or the compressor itself is working too hard because of high head pressure or mechanical wear. A failing inverter module or current-sensing circuit can also report overcurrent that isn't really there. The pattern of when E5 appears is the best clue to which of these you have.
How it looks on the display
Model families & display variants
| Model family | Shows | Note |
|---|---|---|
| Wall units with digital display (Livo, Sapphire, Vireo) | E5 | Shown on the indoor display; the unit retries on its own after a delay. |
| Models without numeric display | lamp pattern | Indicator lamps blink the pattern listed in the owner's manual. |
| Multi-zone outdoor units | E5 on all heads | Because the overcurrent is measured outdoors, every connected head reports it at once. |
Safety first · Consult a professional
Check breakers and the outdoor disconnect only. If you notice a burning smell, scorch marks on the disconnect or a breaker that feels hot, switch the system off and leave it off. The inverter board stays charged for minutes after power-off; only a licensed electrician or HVAC tech should open the terminal cover.
- Unplug the appliance or switch off the breaker before opening any panel. Mains voltage can kill.
Symptoms
- E5 on the indoor display, sometimes only in the hottest hours
- Unit starts, runs briefly and stops; lights may dim at the moment it starts
- E5 coincides with other large loads – dryer, oven, well pump or EV charger
- Breaker for the unit warm to the touch or tripping occasionally
- Outdoor unit sounds strained or hums loudly before stopping
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Low or unstable supply voltage – long or undersized circuit, shared circuit, weak utility supply
- High head pressure from a dirty outdoor coil or failing outdoor fan
- Compressor drawing excess current from wear or binding
- Inverter module or current-sensing circuit on the outdoor board faulty
- Loose or burnt connection at the breaker, disconnect or outdoor terminal block
- Refrigerant overcharge
- Running on a generator or off-grid inverter with poor voltage regulation
Fix it step by step
Log when E5 happens
Note the time, outdoor temperature and what else was running. E5 only with the dryer or oven on points to supply voltage; E5 only in peak afternoon heat points to high pressure; E5 at every start regardless of conditions points to the compressor or board.
Check the circuit from the outside
Find the unit's breaker. Is it a dedicated circuit, as the installation manual requires? Look at the outdoor disconnect for discoloration, melted plastic or a burnt smell – signs of a loose connection that heats up under load.
Tools: Flashlight
Clean the outdoor coil
With the disconnect off, remove debris and rinse the fins gently from the inside out. A clean coil lowers head pressure and the current the compressor needs on hot days.
Tools: Soft brush, Gloves
Reset once
Switch off the breaker for 5 minutes, restore power and restart. If E5 comes straight back on a mild day with nothing else running, the fault is in the unit rather than the supply.
Have voltage measured under load
An electrician or HVAC tech measures voltage at the outdoor terminals at the moment the compressor starts and while it runs, and compares running current with the nameplate. A large voltage drop points to wiring; normal voltage with high current points to the compressor or pressures.
Tools: Multimeter
How to reset E5
- Turn the unit off with the remote
- Switch off the breaker for 5 minutes
- Restart when no other heavy appliances are running and watch whether E5 returns
Where the parts are
- 1Fan
- 2Temperature sensor
- 3CAN bus
- 4Outdoor unit
- 5Compressor
- 6Engine computer (ECM)
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Clean outdoor coil | Yes | $0–$150 |
| Tighten or replace burnt terminals / disconnect | No | $120–$350 |
| Run a new dedicated circuit of the correct size | No | $400–$1,200 |
| Outdoor inverter board replacement | No | $400–$1,000 |
| Compressor replacement incl. refrigerant work | No | $1,600–$3,500 |
Rough US estimates; technician call-out fees vary by region. Not a quote.
When to call a technician
Call an electrician if E5 lines up with other large loads or you see heat damage at the breaker or disconnect. Call an HVAC technician if E5 appears at every start regardless of conditions or persists after coil cleaning – both involve measurements on live circuits.
Frequently asked questions
Why does E5 happen when the dryer runs?
A large load on the same service can pull supply voltage down. With lower voltage, the inverter draws more current for the same output and crosses its limit. The unit should be on its own correctly sized circuit.
Can I run the unit from an extension cord?
No. Split systems must be hard-wired to a dedicated circuit, and even portable-style supplies drop too much voltage over a long cord – a textbook E5 cause and a fire risk.
Does E5 mean the compressor is failing?
Not necessarily. Supply problems and dirty coils are more common. Only if E5 occurs at every start with good voltage and clean coils does the compressor or inverter move to the top of the list.
Sources
- Official Gree user documentation and support pages (facts only; wording is our own)
- Methodology: How We Build Code Pages · Data Sources We Use · Editorial Policy