› M1 Support Forum › Honeywell 5800Combo This topic has 1 reply, 2 voices, and was last updated October 25, 2021 at 8:06 am by Brad Weeks. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts October 22, 2021 at 9:52 pm #5650 Tomas Nanko Hello, Will the Honeywell 5800Combo work with M1? October 25, 2021 at 8:06 am #5651 Brad Weeks The Honeywell 5800 COMBO Smoke/CO is NOT compatible with the ELK M1 System Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In