Furnace leaking water from bottom of casing or condensate connections

Safety first: Turn off power. Water inside the appliance can contact live parts. Close the system isolation valves if possible.

• 1. Identify leak source: Remove the front cover and inspect with a flashlight. Look for water trails from the condensate trap, hoses, pump, or joints.
• 2. Condensate trap cleaning: On condensing models, remove the condensate trap according to Junkers instructions. Rinse thoroughly under running water to remove sludge. Refit ensuring seals are correctly seated.
• 3. Check hoses: Inspect condensate and internal hoses for cracks or loose clamps. Replace damaged hoses with heat-resistant condensate tubing.
• 4. Hydraulic block and pump: Examine the pump and hydraulic block for drips at seals or unions. Tighten unions gently; if seals are perished, replace O-rings or gaskets.
• 5. Heat exchanger: If water appears to come from the primary heat exchanger body, corrosion may have perforated it. This usually requires replacement of the heat exchanger by a qualified technician.
• 6. Dry and test: After repairs, dry the interior, restore power, and monitor for further leaks.