E3-00 — OU: Actuation of high pressure switch (HPS)

What does E3-00 mean?

The high-pressure switch (HPS) in the outdoor unit (OU) has been activated.

• Overcharged refrigerant system
• Blocked refrigerant lines
• Malfunctioning HPS sensor

Click steps to track your progress.

1. 1

   Ensure the outdoor unit's air vents are completely clear.

2. 2

   Check if the unit is operating in extremely high ambient temperatures.

3. 3

   Do not attempt to adjust refrigerant levels yourself.

4. 4

   A certified technician must diagnose and resolve high-pressure issues.