camd1994

Hi All I have three smoke alarms in the same circuit in the house. Two of these alarms have recently illuminated red and the other is still green. I have tried changing the backup battery on both of these alarms but still the alarms illuminate solid red. I’ve checked the supply and there is definitely a supply to both alarms. The alarms aren’t making a noise unless you press the test button and they work fine but both red lights will not clear? Any advice would be appreciated.