Viadrus
Overpressure / Safety Valve Discharge
Water leaking from the safety (pressure relief) valve discharge pipe near the Viadrus furnace.
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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 vessel, Overfilled heating system, Faulty pressure relief valve, Blocked connection between vessel and system
How to Fix / Troubleshooting
Safety: Hot water can cause burns. Allow the system to cool before working on the safety valve or expansion vessel.
- Check system pressure: Read the pressure gauge when the system is cold. If it is above the recommended value (often 1.5 bar), drain some water from a drain cock until the pressure drops.
- Test expansion vessel: A technician can isolate and check the air charge in the expansion vessel using a tire gauge. If the air side is flat or waterlogged, the vessel must be recharged or replaced.
- Inspect safety valve: If the valve continues to drip at normal pressure, it may be fouled by debris. It should be replaced rather than repaired.
- Check vessel connection: Ensure the pipe between the system and the expansion vessel is not blocked by sludge.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Vessel
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