Haier HSU-12RS03/R2(SDB) - User Manual

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SERVICE MANUAL

Order No.$&69

S -Series

© (Qingdao Haier Air Conditioner General corp.,Ltd)

All right reserved .Unauthorized copying and distribution is a violation of law

Haier Group

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.

Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or

repair the product or products dealt with in this service information by anyone else could result in serious injury or death

WARNING

Wall mounted Type

DC Inverter

Model No.

HSU-09RS03/R2(SDB)

HSU-12RS03/R2(SDB)

Table of Contents

Questions and Answers:

G
gary17Aug 8, 2025
Why is my Haier Air Conditioner cooling poorly?
- M
  Marisa MedinaAug 8, 2025
  Poor cooling in your Haier Air Conditioner can stem from several factors. First, ensure the air filter is clean; it should ideally be cleaned every 15 days. Check for any obstructions blocking the air inlet and outlet. Verify that the temperature is set correctly. Also, make sure all doors and windows are closed. If direct sunlight streams in, use curtains to block it. Finally, consider if there are excessive heat sources or too many people in the room.
B
brettgrantAug 13, 2025
How to fix a Haier Air Conditioner that does not restart immediately?
- J
  jjohnsonAug 13, 2025
  If your Haier Air Conditioner doesn't restart immediately after being stopped, it's because the system needs to protect itself. There is a 3-minute delay to protect the system. If you unplug and replug the unit, this protection circuit will also activate for 3 minutes.
B
Brenda LeeAug 19, 2025
Why does my Haier HSU-12RS03/R2(SDB) Air Conditioner smell?
- T
  Tamara CamachoAug 19, 2025
  The smells generated from your Haier Air Conditioner are due to the system circulating odors from the indoor environment, such as furniture, paint, or cigarette smoke.
N
newmanjasonAug 26, 2025
What is that noise coming from my Haier HSU-12RS03/R2(SDB) Air Conditioner?
- C
  Candace ClineAug 26, 2025
  The swishing, gurgling, or cracking noises you hear from your Haier Air Conditioner are normal. The swishing or gurgling sound is refrigerant flowing through the system, most noticeable in the first few minutes of operation. The cracking noise comes from the casing expanding or contracting due to temperature fluctuations. However, a significant noise from airflow could indicate a dirty air filter.
C
Charles AlvarezSep 1, 2025
Why can’t I change the fan speed in dry mode on my Haier HSU-12RS03/R2(SDB) Air Conditioner?
- L
  Lisa StewartSep 1, 2025
  In DRY mode on your Haier Air Conditioner, the fan speed cannot be changed because when the room temperature drops below the set temperature plus 2 degrees Celsius, the unit will run intermittently at LOW speed, regardless of the fan setting.

Haier HSU-12RS03/R2(SDB) Specifications

General

Power Supply	220-240V, 50Hz
Refrigerant	R410A
Type	Split
Cooling Capacity	12000 BTU
Operating Temperature (Cooling)	18°C to 43°C

Summary

Introduction

Safety Cautions

General safety cautions for repair and operation.

List of Functions

Specifications

Indoor Unit Specifications

Technical specifications for the indoor unit.

Outdoor Unit Specifications

Technical specifications for the outdoor unit.

Printed Circuit Board Connector Wiring Diagram

Indoor Unit Connector Wiring

Details indoor unit PCB connectors and their functions.

Outdoor Unit Connector Wiring

Details outdoor unit PCB connectors and their functions.

Functions and Control

Indoor Unit Functions and Control

Details indoor unit operating modes, temperature, and special functions.

Outdoor Unit Functions and Control

Explains outdoor unit operation frequency, fan control, and protection functions.

Main Thermistor Function

Explains the function of main thermistors in the system.

Thermistor Value Tables

Provides resistance values for thermistors at different temperatures.

System Configuration

System Configuration and Handling

Guidelines for operating and handling the air conditioner post-installation.

Parts and Functions

Indoor Unit Components

Overview of indoor unit components and features.

Outdoor Unit Components

Overview of outdoor unit components.

Remote Controller Functions

Detailed explanation of the remote controller's buttons and functions.

Operation

Remote Controller Operation Details

Explains specific operations like Clock Set and Battery Loading.

Specific Operation Modes

Details on SMART, COOL, HEAT, DRY, and Timer operations.

Advanced Operation Features

Covers SLEEP, iFP, ECO, and FRESH operations.

Service Diagnosis

Caution for Diagnosis

General precautions before performing diagnostic procedures.

Problem Symptoms and Measures

Troubleshooting guide for common operational issues.

Error Codes and Display

Lists error codes and their corresponding descriptions and references.

Thermistor or Related Abnormality

Diagnosing thermistor failures and related issues.

Indoor Fan Motor Malfunction

Troubleshooting steps for indoor fan motor failures.

IPM Protection and Communication Errors

Diagnosing IPM protection and communication faults.

Outdoor Unit Sensor Failures

Diagnosing failures of outdoor unit sensors like frost-removing.

EEPROM and Voltage Faults

Troubleshooting EEPROM errors and power supply voltage issues.

Compressor Loop and Over-current Faults

Diagnosing compressor rotor detection errors and over-current faults.

Cautions

Installation and General Cautions

Important warnings and cautions for installation and general use.

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