Heatrae Sadia
Temperature and Pressure Relief Activation
Heatrae Sadia cylinder’s temperature and pressure relief valve discharges hot water intermittently.
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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
Cylinder overheating, Excessive system pressure, Faulty T&P valve, Incorrectly set or failed thermostat
How to Fix / Troubleshooting
Safety first: Discharge from a T&P valve indicates a potentially dangerous condition. Do not cap or block the discharge. Isolate power and, if safe, reduce heat input.
Steps to investigate:
- 1. Check cylinder temperature: If the cylinder is excessively hot, turn off all heat sources (immersion and boiler).
- 2. Verify thermostat operation: Ensure thermostats are correctly set and functioning. Replace any that allow overheating.
- 3. Check pressure controls: Confirm the inlet control group and expansion vessel are operating correctly and that cold fill pressure is within specification.
- 4. Test T&P valve: Operate the test lever briefly to clear debris. If the valve continues to leak or fails to reseat, replace it with the correct Heatrae Sadia T&P valve.
- 5. Professional service: Due to the safety-critical nature, have a G3-qualified engineer inspect the system.
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Repair Difficulty
Professional Required
5/5
Required Part
Temperature and Pressure Relief Valve
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