The hazard lies in the case of a power outage. That's when the device may go into a latched mode, causing it to not go off when smoke or carbon monoxide is in the air.
The agency said this can happen if the power is shut off while the alarm is performing a once-per-minute sensor health check.
If the alarm is part of an interconnected system, it will still go off, even if it's affected by the alarm deficiency.
Once the power turns back on, a latched alarm will ring, even if smoke or carbon monoxide isn't present.
The alarms are white in colour, round and about 13 centimetres to 15 centimetres in diameter with an engraved Kidde logo on the front.
They are AC/DC powered and can be hardwired to a network.
Labels showing the model number and date code are located on the back of the device, which has the year, month and day it was manufactured.
Neither Kidde nor Health Canada have received any reports of injuries or incidents related to this issue.
Another 670,000 of the alarms have been sold in the United States.Suggest a correction