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Question DetailsAsked on 11/24/2015

Dryer vent won't stop running.

The dryer is not running, but the vent is. How can I get it to stop?

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Voted Best Answer

If dryer is off, then you are talking a booster fan in the dryer ducting, used to provide adequate airflow in situations where there is significant lift involved, or the ducting has to be too long for the dryer itself to safely move the air and lint.

This separate motor is activated by a relay switch, usually in a junction box near or even mounted on the dryer but on a separate outlet or wiring box (or should be), and the relay must be stuck in the on position, which sometimes happens as relays get old. The relay is usually activated by power flowing through the white lead wire to the dryer itself, so when the dryer is pulling power the relay turns the booster fan on. Therefore, the junction (and possibly switch) box for the fan is usually very close to the dryer outlet, or sometimes mounted on the dryer itself with a lead wire back to the fan control box from the dryer.

Look for a possible manual light-type switch possibly near the dryer outlet that might control the power to the fan, or if fan is in an exposed spot possibly near the fan itself. Occasionally these type fans also have regular plugs for their power leads which plug into the nearby outlet box - if so, pulling the plug would stop the fan. Remotely possible there is an on-off switch on the fan itself, too.

Otherwise you would need to find out which circuit breaker powers that outlet to turn it off. Could be a separate circuit, probably more likely (for a single-family residence) shares a circuit with some other outlets. If unusually wired might be tapping off the double breaker that powers the dryer so try turning the dryer breaker off, but would be on a different circuit to meet code in most areas.

Pulling the plug on the dryer itself should NOT work if wired correctly, but if you have as second cord coming out of the dryer to the wall you could try that. If the dryer outlet is at all loose do NOT try unplugging it - you don't want to pull the outlet out of the wall or anything - significant safety risk in that event.

Heating and A/C would be your normal Search the List category for a technician to fix this. While an electrician could certainly do the wiring, getting the part is more typically a HVAC type item, so I would go with them. Be sure to ask if they can do the replacement, because in some areas with strict code enforcement they might require an electrician do the actual wiring, even though getting the part might mean you or him going to a HVAC parts source for the new booster fan control switch - pretty highly unlikely that an electrician would have the part in his normal shop parts - this is definitely an HVAC type component, and generally NOT the type of thing they carry in the truck, so don't count on an initial visit fix.

Answered 4 years ago by LCD

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