Viadrus Weeping Safety Relief Valve

Boiler’s safety relief valve discharges water intermittently, even when pressure seems normal.

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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

Debris on valve seat, Slight overpressure during heating due to undersized or failed expansion vessel, Faulty safety valve spring

How to Fix / Troubleshooting

Safety first: Discharged water may be hot. Route the discharge safely to a drain. Never cap or block the safety valve outlet.

Step-by-step checks:

  • 1. Check pressure behaviour: Note cold and hot pressures. If hot pressure exceeds 3 bar, the expansion vessel may be faulty or undersized.
  • 2. Operate valve: Briefly lift or turn the safety valve test knob to flush debris from the seat, then release to allow it to snap shut. Check if dripping stops after a short time.
  • 3. Monitor: If dripping continues, the valve may be damaged and should be replaced.

When to stop: Expansion vessel and safety valve replacement should be done by a heating engineer.

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Repair Difficulty

Medium 3/5

Required Part

Safety Relief Valve
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