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5634 / 5635 / 53

Alarm code 53 — Communication error between in- and outdoor unit

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

What does 5634 / 5635 / 53 mean?

A communication error exists between the indoor and outdoor units, indicated by LG error code 53.

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 27)Search more codes in this manual