Bosch BMS500-AAU018-1AHCXB User Manual

Service Manual
Ductless Air Conditioner / Heat Pump
Multi Zone Outdoor Units
Climate 5000 Series
BTC 769102304 A / 01.2023
WARNING:
f Installation must be performed by a licensed
contractor, and per the instructions in the
installation manual. Improper installation can
cause water leakage, electrical shock, or fire.
f In North America, installation must
be performed in accordance with the
requirement of NEC (National Electric Code)
and CEC (Canadian Electric Code) by licensed
and qualified personnel only.
f Only contact a licensed contractor for repair
or maintenance of this unit.

Bosch BMS500-AAU018-1AHCXB Specifications

General

Brand	Bosch
Model	BMS500-AAU018-1AHCXB
Category	Air Conditioner
Language	English

Summary

Key Symbols and Safety Instructions

Safety Precautions

Crucial safety precautions before installation and operation.

Wiring Diagrams

Installation Details

Electronic Functions

Main Protection Mechanisms

Details various protection mechanisms for the unit.

Control and Functions

Troubleshooting

Outdoor Unit Error Codes

Lists error codes and their status for outdoor units.

Quick Check by Error Codes

Correlation table between error codes and potential causes.

ODU PCB & IPM Diagnostics

EEPROM Parameter Error (EC 51)

Troubleshooting for EEPROM parameter errors.

Indoor/Outdoor Communication Error (EL 01)

Troubleshooting for communication errors between units.

IPM Board Communication Error (PC 40)

Troubleshooting for IPM and main board communication issues.

Sensor Malfunction Errors

Voltage Protection Errors (PC 10/11/12)

Troubleshooting for voltage protection errors.

PFC Module Protection Error (PC 0F)

Troubleshooting for PFC module protection errors.

Outdoor Fan Speed Malfunction (EC 07/EC 71)

Troubleshooting for outdoor fan speed issues.

High Pressure Protection (PC 30)

Troubleshooting for high-pressure protection errors.

Low Pressure Protection (PC 31)

Troubleshooting for low-pressure protection errors.

Current Overload & Speed Issues (PC 08/44/46/49)

Troubleshooting for overcurrent and speed control issues.

Compressor Discharge Temperature Protection (PC 06)

Troubleshooting for compressor discharge temperature protection.

High Condenser Temperature Protection (PC 0A)

Troubleshooting for high condenser temperature protection.

Inverter Module (IPM) Malfunction (P6)

Troubleshooting for IPM module malfunctions.

Compressor Top Temperature Protection (PC 02)

Troubleshooting for compressor top temperature protection.

DC Fan Motor Phase Failure (EC 72)

Troubleshooting for DC fan motor phase failures.

Compressor Phase Protection (PC 43)

Troubleshooting for compressor phase protection.

IR Chip Drive Failure (PC 45)

Troubleshooting for IR chip drive failures.

Board Communication Malfunction (ODU Ed)

Troubleshooting for communication errors between boards.

Main Parts Check

Disassembly Guide

Outdoor Unit - BMS500-AAM018-1CSXRC

Outdoor Unit - BMS500-AAM027-1CSXRC, BMS500-AAM018-1CSXHC, BMS500-AAM027-1CSXHC

Outdoor Unit - BMS500-AAM036-1CSXHC, BMS500-AAM048-1CSXRC, BMS500-AAM048-1CSXHC