Water heater not getting voltage.

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  #1  
Old 03-03-13, 06:50 PM
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Water heater not getting voltage.

We suddenly stopped getting hot water (newish 40 gal electric water heater) so after a few checks I've narrowed it down to an electrical problem. I'm only getting around 30 volts (haven't measured amps yet) at the point the power enters the water heater whereas I'm getting 240 volts leaving the 30 amp 240 breaker (the water heater is the only thing on that circuit). Does anyone have any ideas what could cause the voltage drop? It's only about 20ft from the breaker box to the water heater (the wires are in metal conduit behind the wall). Any help would be greatly appreciated.
 
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Old 03-03-13, 06:53 PM
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How are you measuring this voltage, where on the water heater and what are you using as a testing device? It helps for us to know that.
 
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Old 03-03-13, 07:08 PM
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Thanks for the quick reply. I'm using a Klein Tools multimeter to measure the AC voltage between the wires leaving the metal conduit and entering top of the water heater through a small access panel. These wires are then joined (with wire nuts) to two other wires that connect to the thermostat, heating elements etc. The voltage at both elements is down to about .04 volts.
 
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Old 03-03-13, 08:16 PM
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Just to be clear with the two wires from the conduit disconnected what is the voltage between those wires? Again with those wires disconnected what is the voltage between each wire and ground?
 
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Old 03-03-13, 09:36 PM
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With the two wires from the conduit disconnected the voltage between them is around 30 volts. I haven't checked the voltage between the wires and the ground yet and it's too dark here to test now. I will try and test that in the morning. Thanks for the reply.
 
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Old 03-04-13, 03:20 PM
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So I checked each leg against the ground and found I wasn't getting 120v on one of them, I eventually tracked it back to a broken breaker.
 
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Old 03-04-13, 04:10 PM
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Glad you got it. Thanks for letting us know.
 
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