George is this a new system and has it finished the learning mode? https://www.acurite.com/media/manuals/01536CAUDI-instructions.pdf see page 12. Some times you may need to let it go through the learning mode a couple of times. If it loses power it will start learning all over, also this learning mode lasts up to 33 days the first 14 only gets it close. The 01536caudi is the same as the 01536 its just set up for Australia.