Boiler leaking water from underneath the casing or from pipe connections

Safety: Isolate electrical power and, if leak is significant, close the boiler isolation valves. Water near electrical parts is dangerous.

• Locate the source: Remove the front panel and use a torch to trace the leak upward. Look for staining or limescale trails from joints, pump, or heat exchanger.
• Tighten fittings: Gently tighten accessible compression nuts on pipe connections, but do not overtighten. Wipe dry and recheck.
• Check automatic air vent: Inspect the air vent on top of the pump or heat exchanger. If it is weeping from the cap, tighten the cap slightly or replace the vent.
• Pump and seals: If water is seeping from the pump body or shaft, the pump or its gasket set must be replaced.
• Heat exchanger leak: If water appears from the bottom of the combustion chamber or around the primary heat exchanger, stop using the boiler and call a Hoval service technician. The heat exchanger may need replacement.