BoilerFaultCodesTechnical description
Maximum charging time for a storage without own controller
What causes this fault?
This fault occurs when the boiler detects that it has been running for an unusually long time without successfully heating your hot water cylinder to the set temperature. The most common reasons are a faulty sensor failing to report the correct temperature or a mechanical part, like a valve, getting stuck and preventing hot water from reaching the cylinder.
This issue is often more noticeable in winter when the incoming cold water mains temperature is lower, forcing the boiler to work longer to heat the cylinder.
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.
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