The air pressure switch can fail to shut down the burners when there is a blockage in the vent system, allowing the boiler to emit excessive amounts of carbon monoxide and posing a CO poisoning hazard to the consumer.
The adjuster cap and brake cable can slide out of position and make the brakes non-operational. This can cause a rider to lose control of the bicycle and crash.
The bicycle seatstay or linkage component parts used to connect the seat tube and rear axle dropouts can be incorrectly sized which can cause the frame to collapse, posing a fall hazard to the rider.
