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LED2 6 Flashes, LED1 3 Flashes

Hydraulic Indoor Unit LED2 (Green) 6 Flashes, LED1 (Red) 3 Flashes - Inverter error

Fujitsu · Waterstage SuperHP Heat Pumps

What does LED2 6 Flashes, LED1 3 Flashes mean?

This error indicates a problem with the inverter system in the outdoor unit, which controls the compressor speed. The outdoor unit may also show '18 Flashes' after pressing the ENTER switch.

Common Causes

  • Faulty inverter component.
  • Overload or short circuit in the inverter circuit.
  • Issues with power supply to the inverter.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the main power supply to the heat pump for 30 seconds, then turn it back on.

  2. 2

    Check for any obvious obstructions around the outdoor unit that could cause overheating.

  3. 3

    If the error persists, use the 'Reset HP' function (Line 6711) in the control system.

  4. 4

    Contact a qualified service technician, as inverter issues require specialized repair.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

10Error 10 - Outdoor sensor fault100Error 100 - Two master clocks on bus102Error 102 - Clock without running supply
Source: Fujitsu Waterstage SuperHP Heat Pumps
Open Manual (Page 48)Search more codes in this manual