In a 22,000-m² warehouse, a valve on the sprinkler network broke as a result of freezing. The water leak triggered a load loss in the network and activation of 2 diesel-powered pumps, which stayed on after the sprinkler network’s backup water supply tank had emptied. Since the two motors were no longer being cooled (cooling circuit water extracted by tapping on the pump discharge line), ignition occurred due to overheating of one of the motors; the fire outbreak was quickly extinguished thanks to the absence of combustibles inside the sprinkler utility room. Storage cells were slightly flooded, yet since merchandise was being stored on pallets, no losses were reported. The water poured from sprinklers was pumped and removed via the city’s storm drain network. The automatic sprinkler-type extinction system became inoperable until being repaired.