CodeRegistry
Brands
  1. Home
  2. Bosch
  3. Alarm List A/W Split (8754) 2018 01 10
  4. 5668 / 5669 / 55
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

5668 / 5669 / 55

Alarm code 55 — Z1 Communication error btw. indoor and outdoor unit

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

What does 5668 / 5669 / 55 mean?

A communication error exists between the indoor and outdoor units, indicated by LG error code 55.

Common Causes

  • Communication failure between indoor and outdoor units

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to separate error handling instructions for Split outdoor unit.

  2. 2

    Check wiring between indoor and outdoor units.

  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