What does Gree error H3 mean?
H3 means the compressor's overload protector opened: the compressor got too hot or ran under too much load. The AC stopped it so it doesn't burn out. Once it cools down, the AC often restarts by itself.
Why does code H3 appear?
- Low gas, which keeps the compressor hot.
- The outdoor coil is dirty, or the unit is in direct sun and a closed space.
- Low mains voltage.
- A loose overload wire or a faulty overload protector.
What can you safely check for H3?
- Turn the AC off and let the compressor cool for 30 minutes, then start it.
- Open up space around the outdoor unit and check that its fan runs.
- If the voltage is low, keep the AC off.
Safety: never reach into an electrical panel, board, gas pipe or the inside of an inverter yourself. You can get a shock or release gas. This is a mistri's job.
When should you call a mistri?
If H3 appears daily, call a mistri. Checking gas pressure, cleaning the condenser and testing compressor wiring are a mistri's job. Repeated overloads can burn out the compressor.