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Old 07-03-2012, 12:57 PM   #1
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Pool pump is out


Power to pump from circuit breaker 3 wires 2 black one white,each black wire reads 120 V when checked to ground, when I check the 2 black wires don't get any volts reading.Pump runs when tested directly to 120V outlet.
Pump suppose to be 1Phase 240V.
Need help to figure out what is the problem.

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Old 07-03-2012, 01:09 PM   #2
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Pool pump is out


Is there a timer or switch? What is the white wire for? Is there something else on this circuit?

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Old 07-03-2012, 01:13 PM   #3
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Pool pump is out


Is this a new install or was it previously working? Could you have both blacks on the same phase?
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Old 07-03-2012, 01:29 PM   #4
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Pool pump is out


Pump was installed 3 years ago just quite running 2 weeks ago
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Old 07-03-2012, 01:31 PM   #5
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Pool pump is out


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Originally Posted by mpoulton View Post
Is there a timer or switch? What is the white wire for? Is there something else on this circuit?
There is a timer white is ground not been use
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Old 07-03-2012, 02:18 PM   #6
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Pool pump is out


This doesn't sound like it was wired by someone qualified. White should never be used as ground. Regardless, you should start by measuring voltage between the two hot wires (black) at various points along the circuit: at the breaker, at the input to the timer, at the output of the timer, and at the motor. You should read 240V. A reading of 120V indicates that there is a break in one of the hot wires upstream of that location. So if you measure 240V at the input tot he timer and 120V at the output, then you know one pole of the timer switch is bad.

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