Bosch
Condensate or System Water Leak
Furnace leaks water from the bottom or inside the cabinet
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked condensate trap or drain hose, Cracked condensate collector, Leaking heat exchanger or pipe joint, Faulty pressure relief valve discharging
How to Fix / Troubleshooting
Safety: Turn off power. If the leak is hot water, allow the system to cool before touching pipes.
- Identify source: Remove the front cover and use a flashlight to locate where water originates—condensate components vs. heating pipes.
- Condensate system: Detach the Bosch condensate trap and clean out sludge. Flush the drain hose and ensure it slopes downward with no kinks.
- Relief valve: If water is coming from the pressure relief valve discharge pipe, check system pressure. High pressure indicates expansion vessel or overfilling issues.
- Pipe joints: Tighten accessible compression fittings slightly. Do not overtighten.
Leaks from the primary heat exchanger or internal manifolds require professional repair or replacement.
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Repair Difficulty
Hard
4/5
Required Part
Condensate Trap
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