Dear mates, Don’t you think that Great Spinner Shane Warne misused the communication-technology (SMS, Phone) ?
I had a similar problem with my alarm. I did a renovation to my house and later found that the fine dust was affecting the smoke alarm. whenever a door or window was open ,especially on a windy day the dust particles would affect the alarm. I had alarm replaced(they are almost impossible to clean properly when affected by fine building dust) and have had no problem since.
When you sign the contract with the company to activate your alarm system. The company will install a new one for you. You don't know how old that one is? and it still works or not. A lot of cities will have a big fine when you have a false alarm.
Carbon monoxide is created when there is NOT enough oxygen provided to your appliances that burn fuel. Perhaps your home is too weather tight and inadequate air gets in. You should contact someone who specializes in this problem, and can come up with a solution to provide more outside air to those appliances. I would think a HVAC specialist could help.