Panasonic
Overpressure / Relief Valve Discharge
Water heater is leaking 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
Thermal expansion in closed system, Faulty pressure relief valve, Excessive inlet water pressure, Incorrect expansion tank sizing
How to Fix / Troubleshooting
Scalding hazard: Water from the relief valve can be very hot. Do not cap or block the discharge pipe.
- 1. Check discharge pattern:
- Occasional dripping during heating can be normal due to expansion.
- Continuous flow indicates a problem.
- 2. Measure inlet pressure: Have a plumber check that inlet pressure is within Panasonic's specified range; install a pressure‑reducing valve if necessary.
- 3. Check expansion tank:
- If installed, verify the expansion tank is correctly sized and pre‑charged.
- 4. Replace relief valve: If pressure is normal but the valve continues to leak, have the pressure relief valve replaced.
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Repair Difficulty
Medium
3/5
Required Part
Pressure Relief Valve
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