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5523

Warning Z1 Internal compressor driver warning 3 — Compressor driver overload

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

What does 5523 mean?

This warning is issued if the incoming AC current to the compressor exceeds 31 A, 6 times. It automatically resets after 4 minutes if the condition is no longer met.

Common Causes

  • Temporary malfunction within the inverter.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for the condition to clear automatically (up to 4 minutes).

  2. 2

    Monitor the system to see if the warning recurs.

  3. 3

    If the warning continues or escalates to an alarm (code 5524), further action may be needed.

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
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