Pop open feature
The models that have the automatic control system in the bag door all pop open, sometimes they pop open a little but don’t shut the machine off if the suction holes collar gets stuck in the bag gasket. The spring of the shut off switch is suppossed to help push the door out when it becomes unlocked and if that spring isn’t strong enough it may not open enough to engage the shut off switch.
The plastic bodies models with the knob on the top like the Lux Legacy just have a switch that the automatic control system engages which shuts off the motor and turns on the check bag light. The internal automatic control switch has to be reset by shutting the power switch off then back on again before the vacuum will run again. The bag door does not unlatch or open on these models. This is the way Electrolux of Canada made these machines and when the US and Canadian companies merged, they adopted the plastic body Canadian models for the lower and mid level machines scrapping the 1453 special model.
Jon