Medium Lockout
07 on Glow-worm Xtrafast 96

Your boiler has stopped providing hot water because the internal sensor responsible for measuring water temperature has either failed or has a loose connection.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

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

Domestic hot water thermistor/wiring fault

What causes this fault?

This fault occurs when the boiler's control board loses communication with the sensor that monitors hot water temperature. The most common reason is that the sensor has internal electrical failure due to constant heat cycling, or the wiring connecting it to the main board has come loose or become corroded.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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