I am trying to replace a broken in-wall electric heater. I wanted to confirm if the heater voltage that I am purchasing is the right one, so I got a multimeter and set it at 200V/500V (AC (V with squiggly line)) and touched the white and black, but there seems to be no voltage between any of the wires (with all the circuit breaker switches ON).

  1. Is my multimeter setting wrong (It is set at 200V/500V (AC))
  2. How do I know if there's any point where the current is not flowing?
  3. I have the same problem with the thermostat which is connected to this heater

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  • In most parts of the world, the expected voltage on an in-wall electric heater exceeds 200Volts. 220-250VAC are more typical. In the US 240 would be expected, and if for some reason it was 120 that would still show up on the 500V scale.
    – Ecnerwal
    Nov 20, 2020 at 21:18
  • I checked with 500V setting too. (This is in US) Nov 20, 2020 at 21:18
  • The old heater was 240V, but the circuit breaker is a single switch (which I think, indicates 120V), that's why I thought the circuit might be a 120V. But I tried with both 200 and 500V setting Nov 20, 2020 at 21:21
  • 2
    Pedantic clarification: "Voltage present' and "current flowing" are two different things. The only current flowing here would be the tiny amount that your meter draws.
    – isherwood
    Nov 20, 2020 at 21:24
  • 1
    I will upload the photos and test with the thermostat too shortly. Thank you all. :) Nov 20, 2020 at 22:03


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