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Thread: New motor installed but wont turn on.

  1. Back To Top    #1

    Join Date
    Jun 2015
    Austin, Texas

    New motor installed but wont turn on.

    I installed a new 1.5 hp motor on a pentair challenger and it wont turn on. It doesn't make any noise like it is the capacitor or even shorting out (breaker doesn't trip). I checked voltage with it on and it is receiving voltage to connections. Time clock is giving 125 volts per wire. There is an area where supply wires come into time box that is a little corroded an wire look slightly burned up. Motor shaft is freed up. I tightened them up and seems fine. Any advice would be wonderful. Thanks

  2. Back To Top    #2
    Mod Squad Jimrahbe's Avatar
    Join Date
    Jul 2014
    Bedford, TX

    Re: New motor installed but wont turn on.


    When you test 220 volts, with the motor in the circuit, you never test one hot wire at a time... You need to test between both hot leads (L1 and L2) and ensure you have 220 volts...

    Since it did not trip a breaker I would assume one of the two leads has no voltage on it. Testing one lead at a time, both will show 120 volts, even it one side of the 220 volts is missing because it feeds through the motor.


    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

  3. Back To Top    #3

    In the Industry

    Join Date
    Mar 2010

    Re: New motor installed but wont turn on.

    If you have 220V at the motor, and nothing happens, you have a dead (DOA) motor. Very rare, but it happens. Also verify from either the time clock or the relay that L1 and L3 show 220V. L2 and L4 should be energized (220V) when the relay is closed or the timer is "on".

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