Boiler leaking water from underneath the casing or from pipe connections, no specific error code displayed.

Safety first: Turn off power to the boiler and close the cold water and heating isolation valves. Place a container or towels under the boiler to catch drips.

User-level checks:

• Identify the general area of the leak (front, rear, left, right) without removing sealed combustion covers.
• Do not overtighten fittings yourself, as this can worsen leaks or damage components.

Technical checks (qualified personnel):

• Remove the front cover and inspect all joints, valves, and components for signs of water staining or active leaks.
• Tighten slightly any weeping compression joints and replace olives or fittings if necessary.
• Replace leaking O-rings in the hydraulic manifold or on the plate heat exchanger connections.
• Replace a leaking automatic air vent and ensure the cap is left slightly open as specified.

After repairs, repressurise the system, vent air, and monitor for further leakage.