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5656 / 5657 / 5658

Alarm Z1 Condenser inlet temperature sensor TR3 failure

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

What does 5656 / 5657 / 5658 mean?

The Z1 Condenser inlet temperature sensor TR3 has failed, indicated by an open circuit or short circuit.

Common Causes

  • Open circuit in TR3 sensor
  • Short circuit in TR3 sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the sensor connections.

  2. 2

    Replace the TR3 sensor if faulty.

  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
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