Water leaking from the bottom of the furnace casing

Safety first: Turn off power and close the system isolation valves if possible. Place a container or towels to catch water.

• Locate leak source: Remove the front cover and carefully inspect with a torch. Look for water trails from the pump, heat exchanger, air vent, or pipe joints.
• Tighten unions: Gently tighten any accessible union nuts that are weeping, taking care not to overtighten and damage seals.
• Air vent: If the automatic air vent is leaking from the cap, ensure the cap is slightly open (as designed) but not cracked. Replace the vent if it continues to leak.
• Component replacement: Leaking pumps or heat exchangers generally require replacement by a qualified technician. Do not operate the furnace with an active leak.