The switch when placed in the off position should immediatly shut the furnace down wether it be oil or gas fired.
Red emergency switch for furnace.
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With the furnace running flip the switch to the off position.
If the furnance keeps running the switch wiring is faulty.
The most common is a power cutoff for the furnace located away from the appliance say at the head of the basement stairs.
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These emergency switches should have a red wall plate.
Red emergency switch wall plate covers for oil burners gas burner.
I for one will not be running into a fire to try to reach the shut off switch.
Switchplates designed to meet public safety requirements.
How the furnace switch works.
The switch is supposed to be placed not on the furnance itself but at an easy to.
The most annoying problem of course is if the unlabeled switch on the wall that is frequently mistaken for a light switch.
This circuit is served by its own circuit breaker in the breaker box properly called the main service panel the circuit wiring runs from the service panel to the disconnect switch and from there to the furnace.
Secondly the location of the switch in the furnace room is a poor choice if there is a furnace emergency such as a gas leak or fire.
According to building codes a furnace must be supplied by a dedicated circuit meaning the circuit cannot supply power to anything other than the furnace.