Brand: Haier
Category: Aires Acondicionados
Document Type: Manual
Language: EN
Manual for HSU-12HD03/R2
Uploaded: Nov. 21, 2025, 9:11 p.m.
Manual Publish Date: 2006-01-10
Unit Start: Press ON/OFF button. The unit starts, displaying previous operation status (except Timer setting). Power indicator on the indoor unit lights up.
Select Operation Mode: Press MODE button to cycle through AUTO, COOL, DRY, HEAT, and FAN. The unit runs in the selected mode.
Fan Speed: Press FAN button to select fan speed: AUTO, LO, MED, HI. Note: AUTO is not available in FAN mode.
Unit Stop: Press ON/OFF button. Only the time remains on the LCD. Indoor unit indicators turn off, and the vertical flap closes automatically.
Remote Controller Operation: Aim the signal transmission head at the indoor unit's receiver. Range is up to 7m without obstacles. Avoid dropping the controller.
Battery Loading: Remove the battery cover, insert 2 R-03 batteries following polarity, and replace the cover.
Power Failure Resume: The unit resumes its previous operation after power is restored. For long periods of non-use, shut off the power supply.
Troubleshooting and error codes
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not start | Power cord is not plugged in. | Plug in the power cord. |
| Unit does not start | Fuse is blown. | Replace the fuse. |
| Unit does not start | Remote controller is defective or batteries are dead. | Replace the batteries or use the emergency switch. |
| Unit does not start | Power failure resume mode is active and waiting for delay. | Wait for 3 minutes. |
| Unit does not start | Indoor/outdoor unit wiring is incorrect. | Check and correct the wiring. |
| Cooling is not sufficient | Set temperature is not low enough. | Lower the set temperature. |
| Cooling is not sufficient | Air filter is dirty. | Clean the air filter. |
| Cooling is not sufficient | Room temperature is too high. | Reduce room temperature. |
| Cooling is not sufficient | Outdoor unit is exposed to direct sunlight. | Provide shade for the outdoor unit. |
| Cooling is not sufficient | Airflow is blocked. | Ensure no obstructions around indoor/outdoor units. |
| Noise is heard | Unit is not installed on a level surface. | Ensure the unit is installed level. |
| Noise is heard | Fan is hitting an obstruction. | Check for obstructions. |
| Noise is heard | Normal operation sounds (refrigerant flow, etc.). | This is normal. |