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Thread: FYI - Recommend Periodically Testing End-Of-Cable Voltage On Smartpool Cleaners

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    ChuckDavis's Avatar
    Join Date
    Aug 2010
    Durham, NC

    FYI - Recommend Periodically Testing End-Of-Cable Voltage On Smartpool Cleaners

    I have a Smartpool NC52 (Version 2) Wall Climber (aka Rupert, the pool butler). Smartpool Customer Service will email you the Repair Manual on request. The unit is very easy to work on with basic tools, a (cheap, Radio Shack) volt-ohm meter and tie-wraps. I would expect that this is true for other models also.

    Recently Rupert stopped working. Following the simple diagnostic steps in the manual, I determined that the voltage at the power pack was correct (28-32 volts DC). The voltage at the cleaner end of the cable, where it goes into the pump motor, was only 1-2 volts instead of the normal 25-30 volts DC, however. What was surprising was that the voltage was low, rather than zero voltage from a broken wire. Since low voltage is a standard diagnostic test, this appears to be a known failure condition.

    I replaced the cable and Rupert immediately started working. More interestingly, Rupert was moving faster and vacuuming more vigorously than he had for the last year or so. This implies to me that the voltage had been dropping gradually and finally got too low for Rupert to function. Because of this I would recommend periodically checking the voltage at the cleaner end of the cable and preemptively changing the cable if/when the voltage drops significantly. (I'm not sure what "significantly" is.)

    Note - The strain relief where the cable enters the cleaner had torn about a year ago. On both the old and new cables I used two tie-wraps in a criss-cross to fasten the strain relief to the handle and strengthen the strain relief.

    Note - Marina Pools ( has the best online prices for Smartpool parts that I have found. They are also very helpful with questions over the phone.
    15,000 gallon IGP, epoxy surface, waterfall, borates (!), not closed in winter
    SuperPump with 2.4 THP EcoTech variable speed motor, Tagelus TA-60 filter with zeolite media, Liquidator, AquaComfort heat pump, Blue-White flowmeter, Smartpool Wall Climber
    TF-100, LaMotte metal sequestrant test kits
    Sundance Capri hot tub

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    Join Date
    Apr 2016
    Miami, Fl

    Re: FYI - Recommend Periodically Testing End-Of-Cable Voltage On Smartpool Cleaners

    ChuckDavis, Can you email me the repair manual? I have a NC71 but I guess NC52 and NC71 are similar enough for me to use your manual. I have a very worn cable (the Smartpool service center here in Miami switched my good cable for this one -- and now the service center does not exist) and I suspect a broken cable is the culprit. The scrubber turns on and the main motor works but it does not move. Many thanks for your help. My email is nsrimal at gmail dot com
    In-ground, open air, 30 ft X 15 ft rectangular pool, approximately 16000 gallons. Hayward CX 1750RE cartridge, Hayward SP2600VSP pump. Taylor K-2006 kit. Floatron. Smartpools NC 71 wall scrubber pool robot.

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