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Thread: 1.5 HP Hayward pump not making any noise at all

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    1.5 HP Hayward pump not making any noise at all

    Hi - have a 240v 1.5 HP single speed Hayward pump (motor model UST1152 or C48L2nN134C1 ?)

    It's getting voltage to the wiring in the back, from the timer. The impeller also spin freely.

    When I switch the power on at the timer, I get nothing on the pump. Not even a "whirring" sound.

    Can someone point me in the right direction of what to check next? I have the back cover off the motor, and see a large capacitor (black cylineder) on the left side.

    If I whack this thing, where should I hit it? What contacts should I be looking at to make sure it's getting good connection?

    TIA
    NJ
    16x32 Vinyl lined IG, 1 skimmer, 1 return, 2 seat jets, 19.5k gal, Hayward 4800 fiber clear filter, 1hp pump, heater and in-line chlorinator

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    mas985's Avatar
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    Re: 1.5 HP Hayward pump not making any noise at all

    If the impeller spins freely, it is usually a bad capacitor or the centrifugal switch contacts may be dirty if the motor has one.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: 1.5 HP Hayward pump not making any noise at all

    Thanks - I took the capacitor out. Is there a way to check it on the bench to confirm it's bad?
    NJ
    16x32 Vinyl lined IG, 1 skimmer, 1 return, 2 seat jets, 19.5k gal, Hayward 4800 fiber clear filter, 1hp pump, heater and in-line chlorinator

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    mas985's Avatar
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    May 2007
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    Re: 1.5 HP Hayward pump not making any noise at all

    Remove the wires from the capacitor. With a screw driver discharge across the terminals and then use an ohm meter across the terminals at the highest range. Initially, it should read low resistance and slowly climb to a very high resistance or go over range. If it reads infinite resistance from the beginning or the resistance reads 0 and does not climb, the capacitor is probably bad.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: 1.5 HP Hayward pump not making any noise at all

    Thanks!

    I took off the capacitor, tested it (faulty) and drove down to Grainger and picked up the last one they had in stock. $6 later the pump is running great!

    just saved me a fortune in not buying a new pump! thanks again mas985
    NJ
    16x32 Vinyl lined IG, 1 skimmer, 1 return, 2 seat jets, 19.5k gal, Hayward 4800 fiber clear filter, 1hp pump, heater and in-line chlorinator

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    mas985's Avatar
    Join Date
    May 2007
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    Re: 1.5 HP Hayward pump not making any noise at all

    Glad you got it working.

    BTW, just curious, did the capacitor test infinite resistance or 0 resistance.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: 1.5 HP Hayward pump not making any noise at all

    It tested 0
    NJ
    16x32 Vinyl lined IG, 1 skimmer, 1 return, 2 seat jets, 19.5k gal, Hayward 4800 fiber clear filter, 1hp pump, heater and in-line chlorinator

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