John Wood T&P Valve Discharge

Water leaking from the temperature and pressure (T&P) relief valve on a John Wood 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

Excessive system pressure, Thermal expansion with no expansion tank, Faulty T&P relief valve, Overheating due to thermostat failure

How to Fix / Troubleshooting

Safety: The T&P valve is a critical safety device. Do not cap or plug it. Hot water discharge can cause burns.

  • 1. Check water pressure: Use a pressure gauge on a nearby faucet. If static pressure exceeds 80 psi, install or service a pressure-reducing valve.
  • 2. Thermal expansion: In closed systems, install or check the expansion tank. A failed expansion tank can cause frequent T&P discharge.
  • 3. Test T&P valve: Lift the test lever briefly to flush debris, then release. If it continues to drip, replace the valve with a properly rated John Wood-compatible T&P valve.
  • 4. Check thermostat: Ensure the heater is not overheating. If water is excessively hot, diagnose and repair the thermostat or gas control.
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Repair Difficulty

Medium 3/5

Required Part

Temperature and Pressure Relief Valve
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