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5664 / 5665 / 48

Alarm code 48 — Z1 Liquid in cooling sensor TR4 fault

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

What does 5664 / 5665 / 48 mean?

The Z1 liquid in cooling sensor TR4 has failed, triggering LG error code 48.

Common Causes

  • Failure of liquid in cooling sensor TR4

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to separate error handling instructions for Split outdoor unit.

  2. 2

    Check sensor connections.

  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 28)Search more codes in this manual