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- Slide down the battery cover in the front lower section of the RT310i thermostat.
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- Take a note of the full device code. This will be needed to register your device and may be useful should you require any Technical Support.
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- Insert two new AA Alkaline batteries, ensuring they are securely fitted with the correct polarity.
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- Replace the battery cover by sliding it up from the very bottom of the device ensuring the cover is sat on the sliders.
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