Raypak
Overpressure / Relief Valve Discharge
Boiler frequently trips the pressure relief valve; water discharges from relief outlet.
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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
Failed expansion tank (waterlogged), Overfilling by automatic fill valve, Overheating due to control fault, Incorrect relief valve rating
How to Fix / Troubleshooting
Safety: Hot water can cause burns. Keep clear of the relief discharge when the boiler is hot.
Steps:
- 1. Check system pressure: Read the pressure gauge when the system is cold and hot. If pressure rises excessively when hot, the expansion tank may be failed.
- 2. Inspect expansion tank: For diaphragm tanks, tap the tank: it should sound hollow on top and solid on bottom. If fully waterlogged, it must be replaced.
- 3. Check fill valve: Ensure the automatic fill valve is not over-pressurizing the system. A technician can adjust or replace it.
Do not plug or cap the relief valve. If it continues to discharge, have a professional evaluate the system.
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Repair Difficulty
Hard
4/5
Required Part
Expansion Tank
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