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5604 / 5605 / 23

Alarm code 23 — DC voltage outside of permissible range

Bosch · Alarm List A/W Split (8754) 2018 01 10

What does 5604 / 5605 / 23 mean?

The DC link voltage in the outdoor unit is either too low or too high. The unit may attempt to restart automatically when the voltage is within the normal range.

Common Causes

  • DC link voltage too low
  • DC link voltage too high

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to separate error handling instructions for Split outdoor unit, error code 23.

  2. 2

    Check power supply stability.

  3. 3

    Contact a qualified technician.

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

Related Faults

1001 / A21/A22/A23/A24Alarm A21/A22/A23/A24 — No communication between system controller and remote control1010 / A11Alarm A11 — No communication via EMS BUS connection1037Alarm 1037 — Outdoor temperature sensor faulty, heating standby mode active
Source: Alarm List A/W Split (8754) 2018 01 10
Open Manual (Page 25)Search more codes in this manual