Triangle Tube
Overpressure / Expansion Problem
Boiler frequently releases water from the pressure relief valve
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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), Fill valve set too high, Overheating due to pump failure, Faulty pressure relief valve
How to Fix / Troubleshooting
Safety: Hot water can discharge from the relief valve. Keep clear of the discharge pipe when boiler is hot.
- Step 1 – Check system pressure: Read the boiler gauge when cold and when hot. If pressure rises above 30 psi when hot, the expansion tank may be failed.
- Step 2 – Inspect expansion tank: Locate the expansion tank near the Triangle Tube boiler. Tap it: a waterlogged tank will sound solid. Check the air charge with a tire gauge (system pressure must be zero first).
- Step 3 – Adjust fill valve: Ensure the automatic fill valve is not overfilling the system. Set to the recommended cold pressure.
- Step 4 – Replace components (professional): A technician should replace a failed expansion tank or relief valve and verify system sizing.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Tank
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