Noritz
Relief Valve Discharge / Overpressure or Overtemperature
Water leaking from the pressure relief valve discharge pipe near the Noritz water heater.
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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
Thermal expansion in closed plumbing system, Faulty temperature and pressure relief (T&P) valve, Excessive system pressure, Incorrect relief valve installation
How to Fix / Troubleshooting
Safety first: The discharge pipe may release very hot water. Do not cap or plug the relief valve outlet.
Steps to check and correct:
- Check system pressure: Have a plumber measure static and dynamic water pressure. Install or service a pressure reducing valve if pressure is above local code limits.
- Thermal expansion control: In closed systems, install or service a thermal expansion tank to absorb expansion and prevent relief valve discharge.
- Test T&P valve: Lift the test lever briefly to flush debris, then release. If the valve continues to drip, it may need replacement.
- Professional replacement: Have a licensed plumber replace the T&P valve with a properly rated unit if it is faulty.
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Repair Difficulty
Medium
3/5
Required Part
Temperature and Pressure Relief Valve
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