In most cases you can simply reverse the wire to change how the switch behaves. Either switch can turn the light on or off.

All About Combination Switches And Receptacles Better Homes
Light switch reversed on its own. If not then it is most likely one end of a 3 way switch. Moving the switch lever to the down position turns the lights on. Third it is a three way switch. There are no on or off markings but the light that stays constantly on is controlled by one switch that is located on panel with 2 other switches. Moving the switch lever to the up position turns the lights off. The other 2 switches appear to either do nothing or they are dead.
Hj mar 22 2011. If it is a single pole and not a decora style it should have on and off printed on it and would be impossible to reverse the function. I purposely did this with a 2 gang dimmer box lutron dimmers so that the dimmer slides would be on the outsides of the plate. The switch that suddenly reversed itself is a single switch thats on a different circuit from the one that wont turn off. This often indicates that the metal parts inside the switch are wearing out and that its contacts are failing to make the connections needed to complete the electrical path and allow the light to illuminate. Sounds like one end of a 3 way switch.
The operation of the dimmer is correct in that position moving the dimmer slider up brightens the lights down dims the lights. The switch sits on the hot line to allow or not allow current to flow. But you are describing a three way switch and the other one was used to turn the light on or off which reversed the function of the one you usually use. That means there are two switches controlling one light. The other 2 switches appear to either do nothing or they are dead. The switch and dimmer work fine but the operation of the switch is reversed.
There is another switch somewhere. If this is the case perhaps the other switch is seldom used and. Thats known as a single pole single throw switch sometimes seen as spst. 17 oct 2006 messages. Forgive my ignorance is this a case of face plate being put on upside down. Hi i have a number of light switches in my house that are reversed ie.
There are no on or off markings but the light that stays constantly on is controlled by one switch that is located on panel with 2 other switches. With the switch mounted in the upright position. Check the switch to see if the words on and off are printed on the toggle. As others say is it a switch all on its own with no other switches for that light. The switch that suddenly reversed itself is a single switch thats on a different circuit from the one that wont turn off. Hot and neutral dont go into a light switch only hot.
Discussion in electrics uk started by lynchi 2 mar 2012. Less than a couple of quid there are only two wires on them and it doesnt matter which way the wires go. Look at the switch. Off is on on is off.