Crown
Overpressure / Relief Valve Discharge
Water is dripping from the pressure relief valve discharge pipe
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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
Failed expansion tank, Overfilling by pressure reducing valve, Overheating due to flow issues, Debris on relief valve seat
How to Fix / Troubleshooting
Safety: The discharge pipe may be hot. Do not cap or plug the relief valve outlet.
- Check system pressure: Read the gauge when the system is cold and hot. If pressure rises above 25–30 psi when hot, the expansion tank may be waterlogged.
- Test expansion tank: Tap the tank; it should sound hollow on top and solid at the bottom. If it feels full of water, it may need to be drained or replaced.
- Inspect fill valve: Ensure the pressure reducing valve is not stuck open and that the manual bypass (if present) is closed.
- Cycle relief valve: Briefly lift the test lever to flush debris from the seat, then release. If it continues to drip, replacement is recommended.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Tank
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