BoilerFaultCodesYour boiler is having trouble communicating with the outdoor temperature sensor, which helps the system run more efficiently based on the weather.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: The outside temperature of the sensor connected to the control unit will be utilised internally and transmitted via LON BUS
What causes this fault?
This fault occurs when the boiler's main control board loses the data connection from the outdoor weather sensor. The most common cause is a loose connection or a break in the wiring between the boiler and the sensor, though it can also be caused by a software glitch in the communication module. Because the boiler can no longer see the outside temperature, it will stop modulating based on the weather and revert to a basic backup setting.
This fault often becomes noticeable during the autumn or spring when fluctuating outdoor temperatures cause the expansion and contraction of the sensor's delicate electrical components.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like 97:2 — no call-out fees, no surprises.
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