Abstract: The wireless carbon monoxide furnace shutoff system is a safety device that monitors the interior of a space for unsafe concentrations of carbon monoxide (CO) and carbon dioxide (CO2). The wireless carbon monoxide furnace shutoff system will shut off the furnace should an unsafe concentration of either CO or CO2 be detected within the interior space. The wireless carbon monoxide furnace shutoff system comprises a remote module and a furnace module. The remote module and the furnace module are connected with a wireless communication link. The remote module monitors the concentration of CO and the concentration of CO2 within the interior space. The remote module sends a plurality of messages to the furnace module that enables and disables the operation of the furnace based on the concentration of CO and the concentration of CO2 measured within the interior space.