Today’s post is a follow up to last weeks spa start up article where I briefly mentioned the possibility of a spa air lock. Today we will look at 2 ways you can release an air lock in your spa.

One of the more frustrating problems you can face when trying to start up your hot tub after a fresh fill is an air lock. You’ve spent all that time cleaning out the tub and waiting for it to fill up and when you finally go turn turn the jets on you get nothing. You can hear the jet motors coming on but there’s no flow coming through the system.

Video: How To Avoid an Air Lock in Your Spa

Spa air locks come in varying severities and there are a couple of ways to remedy this issue. One preventative method I talked about in my last post on spa start-up involved putting the hose into the filter well as you re-fill the tub allowing water to fill the spa plumbing easier. This way we can take to try an avoid the hassle of an air locked hot tub in the first place.

Yet even when we try to prevent the dreaded air lock it still happens. Here are a couple ways to release the air lock and get on with enjoying the hot bubbly goodness!

Burp the spa like a baby:

Remove spa jets to clean

  1. open all jets by turning the faceplates counter-clockwise
  2. Turn down heat so heater does not try and fire
  3. Press jet to turn on jets, twice for high speed, let run for 10-15 seconds
  4. Repeat step 3 a total of 3 times increasing run time by 10-15 seconds each time
  5. Once you see air bubble starting to be released from the jets leave jets running until all air is released

If the air lock is not severe you can sometimes release it by simply “burping” the system. Before you do this you want to make sure all of the individual jets are completely open by turning the jet faceplate clockwise as far as they will go. This will make sure there is no added resistance on the system and the air and water can escape from the jets uninterrupted.

One more thing before we start turning the jets on is to make sure the heat is off, either by turning the heat off at the control panel or turning the temperature down as far as it will go, this way the heater wont try to kick on when there is no water flow as that can damage the heater.

How to burp a spa to release air lock

To burp the system all you are going to do is quickly turn the jets on high for 10 seconds and then turn them off, if you have two jet buttons make sure you do this with each jet zone. Do this 3 times and you should see the amount of air bubbles coming out increase each time you turn them on. Keep burping the jets increasing the length of time you hold the jets on by 10 seconds each time. Eventually the whole system will burp and a huge blast of air bubbles will rush out of the jets. If this happens, congratulations you have released the air lock the easy way!

Now if during your initial attempts you see no increase in the amount of air bubbles coming out of the jets or worse no air bubbles at all coming out of the jets you have a severe air lock and you should STOP the “burping” process. The reason you need to stop burping the system if this happens is because if you continue to run the pumps dry you could damage them. This is when we move on to the next method for releasing an air locked hot tub.

Releasing an Air Lock From The Pump Area

bullfrog spa pack releasing and air locked hot tub

  1. Remove front panel of spa (usually Phillips head screwdriver is needed)
  2. Locate large union nut connecting spa plumbing to motor
  3. Loosen nut on pump by hand or using a large set of channel lock pipe grips
  4. Once water starts leaking out all air has been released, you can now re-tighten the union nut
  5. Turn on jets and see if problem has been resolved

If the burping procedure above is not working we need to release the air lock at its source, for that we need to remove the front panel of the spa. Behind the front panel is where all of your spa equipment is located as seen above in this Bullfrog Spa, most spa cabinets just use 4 Philips head screws.

Air locks happen when we fill the hot tub from inside the tub and water falls into the plumbing from the jets, this pushes all the air that is in those lines back to the spa equipment. This air is then trapped between the suction and pressure sides of the system on either side of the jet motor. Therefore the easiest way to release this air pocket is to crack open the union nuts on the spa motor itself.

Where the plumbing connects to the spa pump will be a big white union nut threaded onto the wet end of the motor. You will probably need a good size pair of pipe grips to loosen the union nut, but sometimes you can loosen them by hand. When you loosen the union nut enough you should hear the air escaping.

Once all the air has escaped out of that union water should leak out and you should be able to start the jets right up without any further problems.

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If you have any questions regarding these spa air lock solutions please feel free to leave a question in the comments below or email me directly at: [email protected] Thanks for reading and don’t forget to subscribe to the blog on the top right of this page.

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