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5650 / 5651 / 5652

Alarm Z1 Condensor inlet (heating) TR7 fault

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

What does 5650 / 5651 / 5652 mean?

There is a fault with the Z1 condenser inlet (heating) sensor TR7, indicated by an open circuit or short circuit.

Common Causes

  • Open circuit in TR7 sensor
  • Short circuit in TR7 sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the resistance of the TR7 sensor against the documentation table.

  2. 2

    Repair the sensor cable or replace the sensor if faulty.

  3. 3

    If the sensor is functional, check the installer board for defects.

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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