The Napa Fire Department extinguished a residential fire on Linnell Avenue off the Silverado Trail in Napa at about 6:40 p.m. Saturday.
The fire, which was put out in minutes, may have started when plastic touched a floor heater, according to fire officials.
The flames, 8 to 10 inches tall, were under the house foundation, Battalion Chief Jarrett Anderson said.
At about the same time, a woman was injured in a two-car collision at the corner of Linnell Avenue and Coombsville Road, according to Napa Fire.
The driver was taken by ambulance to Queen of the Valley Medical Center with minor injuries, according to Napa Fire. The other motorist was treated at the scene for a hand injury but was not taken to a hospital, officials said.
Coombsville Road was blocked to traffic while police and fire personnel responded to the crash. Dan Wynn, who lives near the intersection, helped direct traffic for about 45 minutes, dressed as Santa Claus.
Wynn, who directed traffic with his mother, Marlene Wynn, and a neighbor, said he was about to welcome the public in front of his house decorated for the holidays when he heard the crash.