NeoAir No Display
Here are some checks if there is no display on your neoAir, neoAir V2 or neoAir V3 thermostat.
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Try another Set of Batteries.
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Make sure that the batteries are contacting the case on both ends.
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If that does not work, take the battery tray out of the neoAir. Then if you look at the bottom, there are two slots either side of the battery case, using a small flat screwdriver, push it and remove the front cover of the neoAir.
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With the front plate removed, you will see the circuit board. In the centre, there are 3 pins. With the small flat end screwdriver, push them upwards, you may not see them move.
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Then clip the unit back together and see if the display comes back on.