A preliminary investigation by the Incheon Fire Department revealed that the fire was detected by the receiver momentarily after the vehicle busted into flames at 6:09 a.m., but the pre-action valve, which controls the sprinkler system, was turned off from the apartment management office.
The sprinkler system will not activate despite receiving a fire alarm if the valve is deactivated.
The valve was un-paused five minutes later, at 6:14 a.m., but the fire had already affected the repeater in the system, resulting in the sprinkler system not responding to the fire, according to the Incheon Fire Department on Friday.