Buderus
Overpressure / Overtemperature Relief Activation
Water heater's pressure relief valve frequently discharges water.
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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
System pressure too high, Expansion vessel failed or not charged, Faulty pressure relief valve, Overheating due to control fault
How to Fix / Troubleshooting
Safety: Discharged water may be very hot. Turn off power and gas before working on the system.
- Check system pressure: Read the pressure gauge. If pressure is above the relief valve rating, investigate the cause.
- Expansion vessel: Isolate and check the pre-charge of the expansion vessel with a tire gauge. Recharge or replace if the diaphragm has failed.
- Replace relief valve: If pressure is normal but the valve continues to drip, replace it with a valve of the correct rating.
- Check for overheating: Verify that temperature sensors and controls are functioning correctly and that the heater is not exceeding design temperatures.
- Monitor after repair: After corrections, monitor the relief valve for further discharge.
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Repair Difficulty
Hard
4/5
Required Part
Pressure Relief Valve / Expansion Vessel
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