The answer to 'carbon monoxide detector hot to touch' is that a carbon monoxide (CO) detector that is hot to the touch is a sign of a serious issue and should be addressed immediately. This indicates that the detector is malfunctioning and may not be accurately detecting dangerous CO levels in the home.
Common causes for a CO detector being hot include a faulty sensor, a wiring issue, or the detector being placed too close to a heat source. This can be a fire hazard, so it's crucial to unplug the detector and address the underlying problem right away. In most cases, this will require calling a professional electrician to inspect the detector and identify the root cause.