Water dripping from the safety valve discharge pipe periodically.

Safety first: The discharge pipe may carry very hot water. Do not cap or block the safety valve outlet.

Steps:

• Determine if normal: Small intermittent drips during heating are normal as water expands.
• Check mains pressure: If discharge is continuous or heavy, measure mains pressure. If above manufacturer’s limit, install a pressure reducing valve and, if required, an expansion vessel.
• Test safety valve: Operate the manual test lever on the Tesy safety / relief valve to flush debris. If it continues to leak, replace the valve.
• Inspect for scale: In hard water areas, scale can prevent proper sealing. Replacement is usually more reliable than cleaning.