BoilerFaultCodesTechnical description
Condensate drain becomes blocked. (Display will repeatedly flash '0' then '8')
What causes this fault?
This fault occurs when the boiler's internal drainage system becomes backed up with liquid that can no longer escape. The most common reason is a blockage in the external pipe, often caused by a buildup of sludge or debris within the condensate trap itself. When the water level rises too high inside the unit, a safety sensor shuts the system down to prevent internal leaking or damage.
This fault is significantly more common during freezing winter weather, as the external drainage pipe can ice up and prevent water from leaving the boiler.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.