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At the time of the boarding of QR-541, which had the standard time of departure at 3.15 am, the pilot saw fire indication in auxiliary power unit, they said.
Auxiliary power unit, which is the smallest engine, is at the tail end of the aircraft. Its job is to fire up the main engines of the aircraft.
The flight left for its destination at around 8.10 am after the issue was resolved, they said.
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It said that all passengers were provided refreshments.
“We thank our passengers for their patience and understanding, and we apologise for any inconvenience caused by this situation. The safety and security of our passengers remains Qatar Airways’ top priority,” it added.