Refurbished Choice RSTAT9 RF
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Is a battery needed when the screen goes blank
Yes, there are 2x AA batteries inside the thermostat (the bit that moves about). Remove the stand & unclip the two halves (you may need a screwdriver to unclip it, there's a slot on the top, push down and towards the back of the unit). The LCD screen will flash, press SET to stop the flashing and clip the thermostat & stand back together.
New batteries should last around a year & there will be a flashing battery icon to indicate when they are getting low. If you don't have any batteries to hand you can use the manual button on the reciever (attached to your boiler) to turn your heating on/off until you can get some.