BoilerFaultCodesYour boiler is having trouble measuring the temperature of your hot water, which is likely causing your taps and showers to stay cold.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: Problem exists with the secondary (DHW) thermistor.
What causes this fault?
This fault occurs when the boiler's internal sensor can no longer accurately monitor the temperature of the water heading to your taps. Over time, these sensors can degrade due to constant temperature changes or develop electrical faults, causing the boiler to shut down the hot water as a safety precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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