Question about Little Giant Plumbing

1 Answer

My Little Giant 505700 (5.5ASP) does not start by itself when it's covered in water. Once it's helped on (manually pull up the float), it pumps properly and shuts off properly after running for ~30 seconds. When the water fills up again, same thing - it won't start on it's own. It is 15 years old, running only in the winter, and started showing these symptoms this past year. Any fix possible? Perhaps just a cleaning of the lever arm assembly? Replace the switch, although electrically it works?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 216 Answers

I would first start off by removing the float and seeing if it has water in it or a hole. If you don't find a hole or fluid in the float than I might suggest that you adjust the float switch activator on the float rod to a lower setting to see if the added pressure turns on the pump.
If this method fails I would say that the points for the switch have become corroded and should be replaced.

Posted on Oct 20, 2013

Testimonial: "Thanks for the suggestions, Dorrian. The float is intact and their is no adjustment on the float rod on this model. I had planned on taking the unit apart to clean things up and possibly replace the switch when I thought of a kludge fix. I took 6 inches of a lawn sprinkler PVC pipe and sealed off each end with caps, thus creating a float. Then I created a 2nd one. I attached these 2 new floats to the pump float with zip ties. The new combined float now has enough buoyancy to trip the switch! Using 2 PVC floats attached on opposite sides of the pump float provides some sort of balanced overall float. I realize this didn't find the real problem, but for now it's working. By the way, according to literature, this pump is filled with oil. Is that for cooling reasons? If I were to disassemble the pump housing to clean up and/or replace the switch, do you know what kind/weight of oil is used? Thanks."


5 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 927 Answers

SOURCE: Hi, my little giant 506158

For this pump to turn on, it must be under 7" to 10" of water. The water gets into the switch housing (which has an opening in it) and water pressure pushes on the rubber diaphragm (much the same as you did when you removed the cover). Once the pump turns on and lowers the water level to between 1" and 4", the pressure of the water will not be enough to keep the switch closed and the pump stops automatically.

Posted on Dec 11, 2010

Testimonial: "Thanks for the help, I really appreciate it!"

  • 43501 Answers

SOURCE: I have the Little Giant


Either the pump or the motor has seized up...
You need to take the motor off and figure out which it is....
then you can figure out if the pump is bad (bad bearing)
or if the motor has gone bad...


Posted on Mar 20, 2011

  • 1 Answer

SOURCE: Little Giant Condensate VCMA-15UL pump. Pumping when the float was down.

new pump

Posted on Nov 12, 2012

  • 3 Answers

SOURCE: My Little Giant, Model VCMA 15UL, condensate pump

Its probably just crudded up inside. Take the bottom off the pump and you will see the float assembly which looks like a round little donut. This slides up and down on a vertical little shaft. Clean all this up real good. This float must slide up and down very easily. As the water level builds up in the pump this float will slide up the shaft until it makes contact with a little micro switch. When the float touches the switch and pushes in a llittle button the will activate.As the water level falls the donut will slide back down releasing the micro switch and turning off the pump. If it still acts up you might need a new switch which should be available at a local Radio Shack.
If your pump has a standard plug on the end of the power line you should be able to test this with the bottom off and by sliding the float up and down to activate the pump.
So thats my opinion and Im stickin to it...................

Posted on Jan 10, 2013

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Little giant pool pump cover will not work

auto switch is defective? a simple easy replacement can be sourced from any pool supply co

Jan 18, 2014 | Little Giant Pool Cover Pump Water Wizard...

1 Answer

My Little Giant APCP 1700 stopped running even when submerged. Now its stuck in a continuous run mode after I played around with the automatic float stick position. Why is it stuck in this run mode?

the floats are mechanical on these pumps, unlike the electronic ones on other models , the floats can get stuck on them most common reason is forign object stuck up inside area of float (leaves, tree droppings etc)

Feb 03, 2013 | Little Giant APCP-1700 Swimming Pool Cover...

1 Answer

Little giant model 577301 repair 2 years old

Some float switches become defective because they lose their ability to float. For example, becoming saturated with water. The usual solution is replacement of the float switch

Dec 28, 2012 | Little Giant Plumbing

1 Answer

I have a Little Giant 6CIA submersible pump for about 3 years now, used once an in a trap in the basement waiting for a flood. Tried to test it today submersed and it would not work, banged it around a...

This pump works off of a pressure switch. You can remove the cover on the switch located on the side of the pump.You can either buy a switch repair kit, or you can open it up and take a look and see if the diaphragm is sticking. If you remove and clean the parts, you may have some success. Or, just buy the switch repair kit from your local Little Giant dealer. Good luck!

May 02, 2017 | Little Giant 6 Cia, 1/3 Hp, 45 Gpm, 230V...

2 Answers

My Little Giant, Model VCMA 15UL, condensate pump is cycling on and off very frequently. It starts and runs for about five seconds and then stops. It repeats this cycle about every 30 seconds. When this...

Thank you for posting your question here on

Replace the check valve that is part if the discharge hose barb. When it fails the water trapped in the vertical section of the tube comes back into the tank and cycles the float on again causing what you describe. The best way to confirm this would be to watch the water level as soon as the pump shuts off and see if it climbs without any other source of water coming into it. If it is not rising then the issue is with the float itself and is not worth fixing; replace the unit in that case.

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!


Feb 15, 2011 | Little Giant C20ST Condensate Removal Pump...

1 Answer

Hi, my little giant 506158 isn't functioning. When I took of the switch cover and manually depressed the switch the pump came on. Do I need to replace the switch, how exactly does that switch turn on...

For this pump to turn on, it must be under 7" to 10" of water. The water gets into the switch housing (which has an opening in it) and water pressure pushes on the rubber diaphragm (much the same as you did when you removed the cover). Once the pump turns on and lowers the water level to between 1" and 4", the pressure of the water will not be enough to keep the switch closed and the pump stops automatically.

Dec 11, 2010 | Little Giant Submersible Sump Pump 2760...

1 Answer

Little giant pump stopped working

Hi Tom (and Lindsay?),

Ok lets get a little more info,
  1. Plugged in? (Have to ask)
  2. Does it run and not pump?
  3. Does not run?
  4. Tried moving the float switch?
  5. Pull the pump and see if the intakes are clogged
Please comment back with your findings

Apr 18, 2009 | Franklin ELECTRIC/LITTLE GIANT PUMP 1/4HP...

Not finding what you are looking for?
Plumbing Logo

Related Topics:

296 people viewed this question

Ask a Question

Usually answered in minutes!

Top Little Giant Plumbing Experts

Mack Baxter

Level 3 Expert

381 Answers


Level 3 Expert

2428 Answers

Gary Nitowski

Level 2 Expert

298 Answers

Are you a Little Giant Plumbing Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides