What does Haier error E7 mean?
E7 means the indoor unit gets no signal from the outdoor unit. Until the link comes back, the compressor won't run and the AC won't cool.
Why does code E7 appear?
- The wire between the units is loose, cut or wrongly connected.
- Power is not reaching the outdoor unit.
- The indoor or outdoor board is faulty.
What can you safely check for E7?
- Switch the power off for 5 minutes, then start the AC again.
- If the outdoor unit has its own breaker, check that it is on.
- Look from outside for a cut or burnt wire. Don't touch the wires.
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 E7 stays after a reset, call a mistri. Checking wire connections and boards is electrical work.