Abstract: Certain embodiments of the present invention provide a system and method for improved, reliable carbon monoxide detection. The system includes a carbon monoxide detector for detecting carbon monoxide, an appliance powered by a fossil fuel, and a reliability module removing power supplied to the appliance when power to the carbon monoxide detector is exhausted. The reliability module may also remove power supplied to the appliance when carbon monoxide is detected above a threshold concentration. The reliability module may also remove power supplied to a control device controlling the appliance when power to the carbon monoxide detector is exhausted. The control device may include a temperature control. The system may also include a safety device that is activated when power to the carbon monoxide detector is exhausted. The safety device may include a fan. Additionally, the reliability module may include a switch for controlling power supplied to the appliance.