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Red/Green LED flashing (Hydraulic pump)

Circulation Pump Red/Green LED Flashing - Operating error with automatic restart

Fujitsu · Waterstage SuperHP Heat Pumps

What does Red/Green LED flashing (Hydraulic pump) mean?

Both the red and green LEDs on the circulation pump are flashing, indicating an operating error that the system is attempting to resolve with an automatic restart.

Common Causes

  • Temporary malfunction of the circulation pump.
  • Brief obstruction or pressure anomaly in the hydraulic circuit.
  • Intermittent power supply issue to the pump.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Allow the system to attempt its automatic restart to clear the error.

  2. 2

    Ensure there are no visible obstructions around the pump or in the hydraulic lines.

  3. 3

    If the flashing continues or the pump fails to restart, turn off the main power supply for 30 seconds, then back on.

  4. 4

    Contact a qualified service technician if the error persists.

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 39)Search more codes in this manual