Vaillant Siphon Assembly Kit VAILLANT0020240263

The Vaillant 0020240263 is a siphon assembly kit supplied by Vaillant as a spare for its condensing heating appliances. It forms part of the condensate handling arrangement, where the siphon collects the acidic water produced during combustion and discharges it to drain while holding a water seal that stops flue gases escaping back into the appliance or the room. The assembly sits within the condensate trap and siphon group of spare parts and is a serviceable item on appliances where condensate removal is part of normal operation.

• Water collecting around the condensate trap or dripping from the siphon body
• Gurgling, bubbling or irregular draining noises from the condensate route
• The trap holding sludge, scale or debris that will not clear on flushing
• Water backing up in the condensate pipework or the appliance cutting out on a condensate-related fault
• A cracked, distorted or perished siphon body or sealing face

• Confirm the part number against the appliance data badge and the manufacturer's parts listing for your model
• Check the GC number and serial number where the appliance carries them, as build variants can use different condensate assemblies
• Inspect the trap housing and any sealing washers at the same time, as these are often disturbed when the siphon is removed
• Work on the condensate side of a gas appliance should be carried out by a competent person, with the appliance isolated and any casing seals refitted correctly