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Heat pumps · Error codes · Haier
E09Haier · Super Aqua R290 Hydro Split / Hydro All-in-One (AW..HUGHA/HVGHA)

E09 on a Haier Super Aqua R290 Hydro Split / Hydro All-in-One: Indoor Unit Address Duplication Abnormality

Short answer

On a Haier heat pump, E09 means: Indoor Unit Address Duplication Abnormality. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.

Reviewed 23 September 2026 · 1 source

What it means

The manual says: Indoor Unit Address Duplication Abnormality.

Part involved: PCB / communication wiring / settings.

Is it safe?

Does the heat pump stop?Not stated
SeverityFault — clears by itself when the condition goes
Engineer needed?Yes

The manual does not say whether the heat pump stops.

Resetting itself: yes.

What you can check

  • Note the code shown on the controller and the unit model numbers (on the rating plate label) before contacting your installer.
  • Check the heat pump's breaker/isolator at the consumer unit is on; do not open any casing.
  • Check the controller display is lit; a single power cycle at the isolator may be tried only if your installer or manual allows it.
  • Check controller mode/temperature/timer settings have not been changed; setup (DIP switch) errors need the installer.

What the engineer will check

  • Follow the manufacturer's troubleshooting flowchart for this code.
  • Check communication wiring, terminals and fuses between units/controller.
  • Check DIP/rotary switch and address settings.
  • Replace PCB if the fault persists per the flowchart.

Who to ask for: Heat pump engineer.

Certification: Heat pump installer competence; F-gas / flammable-refrigerant (R290/R32) handling competence for any refrigerant-circuit work.

What you might notice

Sources

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 23 September 2026