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10

Error 10 - Outdoor sensor fault

Fujitsu · Waterstage SuperHP Heat Pumps

What does 10 mean?

The user interface displays '10: Outdoor sensor', indicating an issue with the outdoor temperature sensor (Location: BX4 (X84)). This error typically triggers an automatic reset.

Common Causes

  • Faulty outdoor temperature sensor.
  • Damaged or loose wiring to the outdoor sensor.
  • Sensor is obstructed or installed improperly, affecting readings.

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

    Inspect the outdoor sensor for any physical damage or clear any obstructions around it.

  3. 3

    Allow time for the automatic reset to occur (default 6 hours) or use the manual reset function (Line 6711) if available.

  4. 4

    Contact a qualified service technician to inspect or replace the outdoor sensor.

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

Related Faults

100Error 100 - Two master clocks on bus102Error 102 - Clock without running supply105Error 105 - Maintenance message
Source: Fujitsu Waterstage SuperHP Heat Pumps
Open Manual (Page 93)Search more codes in this manual