You run a greater potential for being shocked if you connect the black and white wrong.
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You likely wired it wrong. Not sure what you mean by "fizzle out".
Motors running backwards: A DC motor wired backwards or magnetic field reversed. A 3 phase AC motor with 2 phases reversed A single phase motor will run either way unless it is 'persuaded' by means of a shaded pole or other method to rotate in a particular direction.
1. THE SWITCH IS BAD 2.THE SWITCH WAS RECENTLY REPLACED AND WIRED INCORRECTLY (POSSIBLE IF THERE ARE MULTIPLE CABLES IN BOX 3.THE CABLE IS SHORTED (UNLIKELY, BUT I'VE SEEN IT) 4.YOU'RE TURNING OFF THE WRONG SWITCH-HA
Zero, or very close to it. If there is a large neutral current flowing, voltage drop on the neutral leg could cause a volt or so to read between the two. If you read full line voltage, the outlet is wired wrong!
first of all you buy a double pole unit thermostat which should come with the mounting plate and thermostat and it should have 4 wires 2 red 2 black okay now you join the red to the red power wire and black to the black power wire and the 2 remaining wires which should be a red and black can be joined to the red and black wires on your heater .....now you should be good to go ............LEE48