Furnace displays F13, runs briefly then shuts down, may be associated with condensate issues on condensing Ideal models

Safety: Turn off power before working on condensate components. Condensate is mildly acidic; wear gloves and eye protection.

Steps:

• Inspect condensate pipe: Follow the plastic condensate pipe from the furnace to the drain. Check for kinks, sags, or external blockages. In cold weather, look for freezing at external terminations.
• Clean the trap: Remove the condensate trap from the Ideal furnace (note hose positions). Flush thoroughly with warm water until clear. Reassemble, ensuring all seals are tight.
• Check internal hoses: Ensure all condensate hoses inside the furnace slope downward with no dips that can hold water and cause back-up.
• Test operation: Restore power and run the furnace. Observe for proper drainage and absence of gurgling or overflow.
• If F13 persists: A faulty condensate sensor or internal blockage in the heat exchanger drain may require professional service.