Vaillant 180984 Condensate trap

The Vaillant 180984 is a condensate trap manufactured by Vaillant for use in its gas boiler range. In a condensing appliance, the trap collects the acidic water produced as flue gases cool, then discharges it to the drainage point while sealing the flue path against escaping combustion products. It sits within the condensate traps and siphons group of spare parts.

• Water pooling beneath the boiler or around the condensate pipework, suggesting the trap is no longer holding or discharging correctly.
• A blocked or sludged trap causing the condensate to back up, which can trip the appliance into a lockout.
• Gurgling, bubbling or irregular draining noises from the condensate route during or after firing.
• Visible cracks, split seams or perished seals on the trap body, allowing condensate to weep out.
• Repeated condensate-related fault codes logged by the boiler controls.

• Read the model and GC number from the appliance data badge and confirm the part number 180984 matches the trap currently fitted.
• Check whether a replacement seal or gasket is needed at the same time, as the trap is a wet joint on the condensate path.
• Isolate the electrical supply and allow the appliance to cool before removing the old trap, and expect residual condensate to drain out.