Burner shuts down with indication of condensate fault (for condensing units)

Safety: Turn off power. Condensate is mildly acidic; wear gloves and eye protection.

Steps:

• Inspect trap: Locate the condensate trap on the furnace. Remove and clean it of sludge and debris. Refill with clean water before reinstalling.
• Check hose: Ensure the condensate hose is not kinked, frozen, or blocked. Clear any obstruction and verify proper downward slope to the drain.
• Level switch: If equipped with a condensate float or level switch, check that it moves freely and is not stuck by dirt.

After cleaning, restore power and test operation. Persistent faults may require switch replacement.