There is something wrong with the venting system. It is probably UNSAFE to operate if the switch tripped. If you have a UL approved Co detector. It won't alarm quick enough, as UL approved detectors are designed not to alarm quickly/easily, so as to prevent nuisance fire department call outs.
That switch has a manual reset button on it. So that the furnace and its venting system is checked at the first sign of a problem. If it was an auto reset switch. A lot of people would die before anyone knew there was a problem.
That switch has a manual reset button on it. So that the furnace and its venting system is checked at the first sign of a problem. If it was an auto reset switch. A lot of people would die before anyone knew there was a problem.