Class II - Moderate
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 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.