BoilerFaultCodesTechnical description
OVERHEAT ERROR / WATER PRESSURE SWITCH (Occurs when boiler is hot)
What causes this fault?
This fault occurs when the boiler tries to light the flame several times but fails to detect one, causing the system to shut down for safety. The most common reasons are a lack of gas supply to the unit, a worn-out ignition spark, or a faulty gas valve that isn't opening correctly. In some cases, a blocked flue or moisture on the internal components can also prevent the burner from staying lit.
This issue is more common during extreme cold snaps, as freezing temperatures can causes external gas meters to regulate poorly or condensate pipes to freeze and backup into 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.