Drain Overflow Protection Malfunction

What does P5 mean?

The mechanism designed to prevent drain pan overflow in the indoor unit is not functioning correctly. This could be due to a faulty drain sensor, a malfunctioning condensate pump, or a clogged drain line, leading to water damage.

1. 1

   Verify the drain sensor (P4) is operating correctly by checking its resistance or output.

2. 2

   Inspect the condensate drain line for blockages, kinks, or improper slope that could impede water flow.

3. 3

   If a condensate pump is installed, verify its operation and check its float switch for proper activation and deactivation.