Boiler leaking water from underneath the casing or pipe connections.

Safety: Isolate electrical power immediately if water is leaking near electrical components. Allow the boiler to cool before touching any pipework.

User checks:

• Place a tray or towel under the boiler to contain water and prevent damage.
• Check the pressure gauge; if pressure is dropping rapidly, turn off the boiler and close the isolation valves on the flow and return (if fitted).
• Do not remove the boiler case unless the manual states it is a user-removable front panel.

Engineer checks:

• Remove the front panel and inspect all visible joints, pump, and valves for signs of leakage.
• Check the primary heat exchanger on the EHC boiler for corrosion or pinhole leaks.
• Inspect the pressure relief valve and discharge pipe; if the valve is passing, replace it and investigate overpressure causes.
• Tighten or remake any weeping compression joints using new olives if necessary.

Do not ignore leaks; they can damage the PCB and other components and lead to unsafe operation.