The Queens blaze that killed a mother and her 7-year-old daughter was caused by a damaged air conditioner cord, the FDNY said Monday.

The two-alarm fire erupted on Sunday morning at the 117th Street home in Richmond Hill, leaving Siliva Umana, 51, and 7-year-old Guadalupe Perez dead, officials said.

Umana’s sons, 19 and 15, were also injured in the blaze.

The 19-year-old was taken to Jamaica Hospital Medical Center in critical condition, while the 15-year-old was brought to Kings County Hospital in stable condition.

FDNY spokesman Myles Miller said the cause of the fire was “accidental and electrical in nature.”

“A working smoke alarm was not present,” Miller added.