Question about Smartpool Nitro Wall Climber In-Ground Robotic Pool Cleaner NC51

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My smartpool nitro wall climber robotic pool cleaner NC51 doesn't turn on, nor does the led light of the power supply turn on

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If you have voltage at outlet and you get no lights badpower supply at control box

Posted on Aug 25, 2014


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Nitro wall climber does not move sits at bottom of pool

Plug it in! :o)

Okay, assuming you you get red or green lights on at the power supply? If so...that means:

1. you could have a connection problem between the power supply and the Nitro. You can check connectivity using a simple volt-ohm meter. Replacement cords can be purchased online.
2. One, or both of your drive motors are dead...usually, this because water enters the drive units. Replacing the motors is expensive...$140 or so for the front-wheel drive unit, and $185 for the big one in the center. But even then, these prices you have to search for...

Is it worth it? Hmmm, maybe...Robot cleaners are way too expensive...for what you get. So replacing motors every few years is better than paying $400 - $1000 every few years. These pool cleaners, like old cars, you can keep them going and going by replacing parts.

I am really happy with my Nitro...I put it in my 11,000 gallon pool about 3 times a month, and remove and clean the little guy out right after he is done. Then he goes in the storage rack out of the sun....and he is quite happy.

I used to leave him in the pool, for weeks at a time, and that was when I started running into problems with the motor units leaking...water has a LOT of pressure and is always trying to get in the motor units...and eventually it does. It;s been more than a year since I repaired the seal on my main motor, and replace the drive motor...and I expect a long life out of mine, which is now more than 3 years old and running strong.

Jul 11, 2014 | Smartpool Nitro Robotic Cleaner and Caddy

1 Answer

My Nitro Wall Climber will not seem to turn on. It will work one day and then I cannot get it to work again. Randomly it will respond to my effort to turn it on. The red or green light comes on but the...

Thank you for posting your question here on

The best answer I can give you is that any number of components can cause what you are describing and most of them are not do-it-yourself repairs.

You can contact Smartpool directly for initial assistance in troubleshooting your cleaner. You can reach them at 1-888-560-7665.

If you have a voltage meter try to confirm you are getting ~30 volts out of the power supply with either light illuminated. If not the power supply is failing intermittently. It is more likely the trouble is in one or both motors in the cleaner and/or the cable itself...those items require more extensive testing and would mean the unit needs to be sent in for repairs. Smartpool can recommend the closest service center if need be.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at Positive feedback is appreciated once your problem is solved!


Jul 24, 2011 | Smartpool Nitro Robotic Cleaner and Caddy

2 Answers

My Nitro Wall climber only cleans a small area back and forth for the entire 3 hour cycle. It litterally rocks back and forth in 1-2 second motion spurts. The drive wheel in the back seems to be working,...

The pump motor is responsible for the programming of the unit and it is failing. You will need a new pump motor installed to correct the issue. For information about sending the unit in for repair you can try our site at or the manufacturer at


Aug 19, 2010 | Smartpool Nitro Robotic Cleaner and Caddy

1 Answer

What is the difference between the red light and green light?

my wall climber only wants to climb the walls. it won't run in a straight line. it only cleans a small part of our pool.

Jul 06, 2010 | Smartpool Nitro Robotic Cleaner and Caddy

1 Answer

My Nitro wallclimber floats on the surface and will not sink to the bottom of the pool

The most likely cause is air trapped in the debris bag. Remove the bottom panel with bag. Submerge the cleaner and replace the bag underwater. Also see Smartpool's trouble shooting guide for further assistance.

Mar 09, 2010 | Smartpool Nitro Robotic Cleaner and Caddy

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