E1 - Compressor high pressure protection

What does E1 mean?

This error indicates that the compressor's high pressure has exceeded a safe limit. The system will shut down to prevent damage. This is typically shown on the ODU main board LED display.

• Cut-off valve of ODU is not fully opened
• High pressure switch is abnormal
• Outdoor or indoor fan is not working properly
• IDU filter or air duct is blocked (heating mode)
• Ambient temperature is too high
• System is overcharged
• Refrigerant line set is blocked

Click steps to track your progress.

1. 1

   Ensure the liquid valve and gas valve of the outdoor unit are completely open.

2. 2

   Check if the air outlet of the outdoor or indoor fan motor is normal.

3. 3

   Clear any obstacles at the indoor and outdoor air outlets or return ports.

4. 4

   Verify the operating ambient temperature is within the normal range specified in the user's manual.

5. 5

   If the issue persists, check the wiring of the high pressure switch and test if it works normally. Replace if necessary.

6. 6

   Replace the outdoor main board if other steps do not resolve the issue.