Furnace is leaking water into the cabinet or onto the floor.

Safety: Turn off power before working around water and electrical components.

• Locate condensate system: On high-efficiency Miller furnaces, find the condensate trap and drain hoses near the inducer and secondary heat exchanger.
• Clear trap and hoses: Remove the trap and flush it with warm water to remove debris. Blow out hoses with low-pressure air and reconnect securely.
• Inspect for cracks: Check the plastic condensate pan and fittings for cracks or leaks. Replace damaged components.
• Verify drain routing: Ensure the drain line slopes continuously downward to the floor drain and is not kinked or elevated.