P4 - Drain sensor abnormal

What does P4 mean?

The drain sensor has detected an abnormal condition, usually indicating a problem with the condensate drain system. This could lead to water overflow.

• Clogged condensate drain line.
• Faulty drain sensor.
• High humidity conditions causing excessive condensation.

Click steps to track your progress.

1. 1

   Turn off the unit.

2. 2

   Check the condensate drain pan and line for any visible blockages or standing water. Clear if possible.

3. 3

   Ensure the outdoor drain pipe is not blocked.

4. 4

   Restart the unit. If the error reoccurs or water overflows, contact a service technician.