The indoor drain pan is a tray located beneath the Evaporator Coil to catch condensation. As your Wall Mount unit cools the air, it removes humidity which turns into water. This water must be drained safely through a Condensate Drain Line. If the pan becomes dirty or clogged, it can lead to leaks and water damage. We recommend regular use of the Self-Cleaning Function to keep the pan fresh. We also stock Replacement Drain Pans if yours becomes damaged. It is a vital part of maintaining high indoor air quality. Proper drainage is a key requirement for your Warranty Policy. It’s a simple but vital part of your Heat Pump System.