Haier HFU-12H03/R2(DB)

Questions and Answers

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Jonathan SimsAug 6, 2025
Why is my Haier HFU-12H03/R2(DB) cooling poorly?
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  Barbara GrayAug 6, 2025
  If your Haier Air Conditioner isn't cooling well, several factors could be the cause. First, check if the air filter is dirty and clean it, ideally every 15 days. Make sure there are no obstructions blocking the air inlet or outlet. Verify that the temperature is set correctly for cooling. Also, ensure all doors and windows are closed. During cooling, direct sunlight can impact performance, so use curtains. Finally, excessive heat sources or a large number of people in the room can strain the unit's cooling capacity.
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Robert FisherAug 11, 2025
What to do if my Haier HFU-12H03/R2(DB) Air Conditioner does not work at all?
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  Chad ArmstrongAug 11, 2025
  If your Haier Air Conditioner doesn't work, check a few basic things. Is the power plug properly inserted into the outlet? Is there a power outage in your area? Has a fuse blown out?
B
Becky HartAug 16, 2025
How to restart my Haier Air Conditioner immediately?
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  Chad PattersonAug 16, 2025
  When your Haier Air Conditioner is stopped, it includes a protective delay. It won't restart immediately until 3 minutes have passed. Also, if the electric plug is pulled out and reinserted, the protection circuit will activate for 3 minutes.
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Felicia FergusonAug 22, 2025
Why does my Haier HFU-12H03/R2(DB) Air Conditioner blow out mist or steam?
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  Christopher LewisAug 22, 2025
  During COOL or DRY operation of your Haier Air Conditioner, the indoor unit might blow out mist due to the rapid cooling of the indoor air.
D
Daniel PierceAug 26, 2025
Why does my Haier HFU-12H03/R2(DB) generate smells?
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  Rachel MedinaAug 26, 2025
  The smells from your Haier Air Conditioner are because the system is circulating odors from the room's air, such as smells from furniture or cigarette smoke.
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hoopermanuelAug 31, 2025
Why is there noise coming from my Haier Air Conditioner?
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  Leslie GrahamAug 31, 2025
  Various noises can come from your Haier Air Conditioner. You might hear swishing or gurgling noises during operation or when it stops; this is just the refrigerant flowing. A cracking noise can occur as the casing expands or shrinks with temperature changes. However, a big noise from airflow could indicate a dirty air filter.

Summary

Product Model Coding and Series Introduction

Introductory Remarks

Overview of unit model coding rules and standard operational conditions.

Description of Coding Rules

Detailed explanation of the unit model coding system and its components.

Standard Situation;Conditions

Specifies standard indoor and outdoor air conditions for operation.

Specifications

Cooling and Heating Capacities

Details cooling and heating capacities, coefficients, and power inputs.

Dimensions and Weights

Provides net and packaging dimensions, and unit weights.

Refrigerant and Electrical Details

Lists refrigerant type, charge, and electrical specifications.

Performance Curves

Cooling and Heating Performance Curves

Performance curves showing capacity/input vs. outdoor temperature.

Capacity and Power Input Curves

Curves illustrating capacity and power input at different frequencies.

Compressor Performance Curves

Charts detailing compressor performance metrics like current and capacity.

Components and Accessories

Parts Identification and Diagrams

Diagrams and labels identifying indoor and outdoor unit parts.

Net Dimensions of Units

Drawings showing the physical dimensions of the indoor and outdoor units.

Knock-down Drawings and Part Lists

Indoor Unit Knock-down Drawings

Exploded view illustrating the assembly of the indoor unit components.

Outdoor Unit Knock-down Drawings

Exploded view showing the assembly of the outdoor unit components.

Indoor Unit Parts Catalog

A detailed list of parts for the indoor unit with model and quantity.

Outdoor Unit Parts Catalog

A detailed list of parts for the outdoor unit with model and quantity.

Electrical Control Functions

Introduction to Electrical Function

Overview of the unit's electrical control system and its functions.

Status Conversion and Automatic Operation

Explains status changes and automatic operation modes.

Cooling and Dehumidification Control

Details on air volume and compressor control during cooling and dehumidification.

Heating and Defrosting Control

Control logic for heating, defrosting, and related safeguards.

Protection Functions Overview

Descriptions of various protection mechanisms like low-load and high-load protection.

Abnormity Diagnosis and EEPROM

Information on error codes, abnormality confirmation, and EEPROM functions.

Wiring Diagrams

Indoor Unit Wiring Diagram

Schematic showing the electrical connections for the indoor unit.

Outdoor Unit Wiring Diagram

Schematic illustrating the electrical connections for the outdoor unit.

Circuit Diagrams

Indoor Unit Circuit Diagram

Detailed electronic circuit diagram for the indoor unit.

Outdoor Unit Circuit Diagram

Detailed electronic circuit diagram for the outdoor unit.

Abnormity Diagnosis

Outdoor Unit LED Error Indicators

Table correlating LED blinking patterns to outdoor unit malfunctions.

Trouble Shooting Guide

Normal Performance Troubleshooting

Common issues like system restart, noise, smells, and mist.

Multiple Check Troubleshooting

Checks for issues like no operation, poor cooling, and power problems.

Refrigerating Cycle Diagram

Heat Pump Operation Cycle

Visual representation of the refrigerant flow in heat pump mode.

Noise and Air Velocity Data

Noise Level Test Chart

Graph showing noise levels (dB(A)) across different frequencies.

Air Velocity Distribution Charts

Charts illustrating air velocity distribution from the unit under various conditions.

Installation Manual

Required Tools and Accessories

Lists necessary tools and standard accessories for installation.

Piping and Drainage Connection

Instructions for connecting indoor and outdoor unit piping and drainage.

Outdoor Unit Purging and Wiring Procedures

Procedures for purging the system and connecting electrical wiring.

Power Supply and Final Inspection

Guidelines for power supply, piping cutting, flaring, and final inspection.

Haier HFU-12H03/R2(DB) Specifications

General

Cooling Capacity	3.5 kW
Energy Efficiency Ratio (EER)	3.21
Power Supply	220-240V/50Hz/1Ph
Refrigerant	R410A
Weight (Indoor Unit)	9 kg
Weight (Outdoor Unit)	28 kg
Type	Split Type