When furnace kicked on unused alarm activated.....noticed alarm showing a fault trouble, unplugged alarm in attic that was plugged into service receptical on furnace circuit. Furnace works properly. Checked panels....garage panel has main breaker and proper breakers, has double tapped neutrals and grounds on same bar.....basement panels main is in garage, grounds are separated and bonded together to panel, has proper breakers, Forien substance in panel (paint). All working properly