The answer is in your question, "low batt", it needs replacing.
There is a mains supply to your panel, this needs to be isolated before you open the box.
Open the box, I would expect it to make a noise, enter your code to stop it.
Look at the battery to see what size it is, take these details to somewhere like Screwfix to get a new one.
Fit the new battery, leads the correct way around.
Close the panel and enter your code, turn the mains back on, that should do it.
acorn
May 2012
howtomendit.com for free repair help, information and advice.
