Water is leaking from the bottom of the furnace casing or from connected pipework.

Safety first: Turn off power. If leak is significant, close water isolation valves and protect surrounding areas from water damage.

• Identify source: Remove the front panel and use a flashlight to trace the leak to a specific component (pump, heat exchanger, valve, or joint).
• Tighten unions: Gently tighten any accessible compression or union fittings that are weeping. Do not overtighten.
• Check pressure relief valve: If water is discharging from the relief pipe, system pressure may be too high or the expansion vessel may have failed.
• Call technician for component leaks: Leaks from the pump body, heat exchanger, or hydraulic group require replacement parts and should be handled by a professional.