The main control and timer were wired by a master electrician (now retired) per the installation guide. Neither work at all (the control screen doesn't even come on). Lifebreath refuses to provide tech support. Contractors listed on their website only do the gasfitting side, none that I spoke with provide help with the control. None serve my area (the contractor Lifebreath says is closest to me seems to have passed on years ago). Lifebreath is effectively asking me to hire an electrician that has never installed an HRV system and will never set foot in my house to call tech support, ask my questions, and relay the info to me.