Furnace Maintenance: Water damage found from the condensation plug, added Teflon tape to the plug. Furnace slope adjusted for better drainage. Flushed the condensate P-trap and drain lines to maintain clear, efficient flow. Checked pressure switch tubing to ensure reliable performance. Cleaned and polished the flame sensor for optimal ignition. Ran full diagnostics to confirm the system is running smoothly and efficiently. Recommend a plug in carbon monoxide sensor for added safety.