Nibe Safety valve discharge

Water leaking from safety valve near Nibe furnace or hot water cylinder

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.

Possible Causes

Excessive system pressure, failed expansion vessel, limescale on safety valve seat, overheating

Safety: Leaking water may be hot. Use caution and wear gloves.

Check pressure: Read the system or cylinder pressure. If high, follow the high‑pressure guidance (see D4) to reduce it safely.
Operate valve briefly: With system cool, lift the safety valve test lever for a second to flush debris, then release. This may help it reseat.
Inspect discharge pipe: Ensure the discharge is safely routed to a drain and not blocked.

If leakage continues, the safety valve or expansion vessel must be replaced by a technician.

Medium 3/5

Safety Relief Valve

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