Brand: Haier
Category: Aires Acondicionados
Document Type: Parts/Service
Language: EN
Parts/Service for HSU-18HEA03/R2(DB)-I
Uploaded: Nov. 21, 2025, 7:53 p.m.
Warranty Information
None
1. Introduction
This service manual is intended for experienced repair technicians. It contains safety cautions and details on product functions, specifications, installation, and repair procedures.
2. List of Functions
Details various functions such as Healthy negative ion, Child lock, 3D air flow, Auto restart, Sleep mode, etc., indicating their availability (Y/N).
3. Specifications
Provides detailed technical specifications for both the indoor and outdoor units, including capacity, power consumption, dimensions, weight, and sound levels.
4. Printed Circuit Board Connector Wiring Diagram
Illustrates the connector layouts for the indoor and outdoor unit PCBs, essential for electrical troubleshooting.
5. Functions and Control
Explains the operational modes (automatic, cooling, dehumidification, heating), fan speed control, and various protection functions like low load and high load protection.
Troubleshooting and error codes
| Problem Symptoms | Measures |
|---|---|
| Indoor unit runs, but outdoor unit does not. |
1. Check if the power is supplied to the outdoor unit. 2. Check the connection between the indoor and outdoor units. 3. Check the voltage of the power supply. 4. Check the control PCB for the outdoor unit. |
| The unit does not operate. |
1. Check if the power is supplied. 2. Check if the remote control is working. 3. Check the air filter. 4. Check the installation environment. |
| Cooling or heating is weak. |
1. Check the temperature setting. 2. Check the air filter. 3. Check for obstructions around the indoor and outdoor units. 4. Check the refrigerant level. |
| The unit makes abnormal noise. |
1. Check for loose parts or obstructions. 2. Check the fan motor. 3. Check the compressor. |
| The unit is leaking water. |
1. Check the drainage pipe for blockages. 2. Ensure the unit is installed level. |