Furnace indicates E13, burner stops, and there may be evidence of water around the base of the unit.

Safety: Turn off power and close isolation valves. Hot water leaks can cause burns and structural damage.

• Locate leak: Inspect around the base and sides of the Viadrus furnace. Look for water trails from section joints, pump flanges, safety valve, or air vents.
• Check pressure relief valve: If the safety valve discharge pipe is wet, the system may be over‑pressurizing. This can be due to a failed expansion vessel or overfilling. Have a technician test the vessel and valve.
• Low‑water cutoff: If fitted, inspect the low‑water cutoff probe or float chamber. Clean any sludge and ensure proper operation according to the manufacturer’s instructions.
• Section gasket leak: Leaks between Viadrus cast‑iron sections require disassembly and replacement of section gaskets by a specialist. Do not attempt to tighten section tie rods without proper procedure; this can crack the sections.