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5355

Alarm Z1 Overcurrent on the compressor — Repeated compressor overcurrent warning

Bosch · Compress 7000 Heat Pumps

What does 5355 mean?

This alarm triggers if three warnings (code 5354) are registered within three hours, or if the warning is active for 30 minutes. It indicates a persistent overcurrent condition to the compressor.

Common Causes

  • Broken or shorted cabling between the inverter and compressor.
  • Defective inverter.
  • Electrical fault in the compressor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the cabling between the inverter and the compressor for any visible damage or loose connections.

  2. 2

    If the alarm persists, contact a qualified technician to diagnose the inverter and measure the resistance of the compressor windings.

  3. 3

    Do not attempt to repair electrical faults or replace components yourself.

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

Related Faults

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Source: Bosch Compress 7000 Heat Pumps
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