What does Haier error F4 mean?
F4 means the gas leaving the compressor got too hot, so the compressor was stopped. It often points to low gas, or an outdoor unit that cannot cool down.
Why does code F4 appear?
- Low gas, usually from a leak.
- The outdoor coil is dirty.
- The outdoor fan is not working properly.
- A faulty discharge sensor or its wire.
What can you safely check for F4?
- Switch the power off for 5 minutes, then start the AC again.
- Keep space open around the outdoor unit and check that the fan runs.
- If you see an oily stain at a pipe joint, tell the mistri.
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 F4 keeps coming back, call a mistri. Measuring gas, finding leaks and refilling is only for a trained mistri. Never open a gas pipe or valve yourself.