Condensing Viadrus boiler not producing condensate, or condensate pipe remains dry during operation.

Safety first: Condensate is mildly acidic; wear gloves and eye protection when handling. Ensure the boiler is off and cool before removing the condensate trap.

Step-by-step checks:

• 1. Check flow temperature: Set the boiler flow temperature lower (e.g., 55–60°C) to encourage condensing operation, if your radiators are sized appropriately.
• 2. Inspect condensate trap: Remove and clean the trap of debris or sludge. Refill with clean water before refitting.
• 3. Verify condensate pipe: Ensure the pipe slopes continuously to the drain and is not blocked or frozen.

When to stop: If there is still no condensate and efficiency seems poor, a professional should check combustion settings and system design.