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The Infamous Stubborn FL1 Airlock

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nhowe29:
Hi there, I hate to be the guy posting the same question that has been answered a million times. But I'm at a loss and really don't want to have to call a tech.

I have a Jacuzzi Premium J-340 Model #ZD400GLD Serial #ZD100075251

After a fuse blew during a storm, I replaced it, drained the tub and refilled it since it needed it. I turn on the GFCI again and the fuse holds, but I have the FL1 error. No problem, right? Just some air bubbles. I guess not.

I've tried

1. I unscrewed the pipe fittings around the two pumps to release air. No hissing sounds at all.

2. Tried the hose trick. There are two filters so I tried it on the one without a grate and one with. When I tried it with the one with a grate a ton of air bubbles came out of the footwell. Eventually it was just a tiny bubble every 10 seconds or so and I called it good. No luck. Unfortunately there is no pressure when I put my hand over the intake with a grate. That doesn't seem right.

3. I tried plunging the two filter inlets.

4. Restarted the tub a bunch.

5. Tried started with no filters in.

6. Checked the impeller for clogging. Nothing. Clean as a whistle.

7. Checked circulation pump for vibration. It seems to be humming away but it was hard to tell. It wasn't as hot as I expected it to be. No suction over the filter with a grate is making me think it's shot/malfunctioning.

All the jets work except one or two in a set on one corner. Waterfall works.

I don't really understand how to check the flow switch, so maybe I need to replace that?

Or throw in the towel and call the techs.  :-[

Sam:
Some airlocks can be stubborn.  There is a small drain plug on the wet end of the pump.  Completely remove it and let water shoot out for a few seconds.  Put the plug back in and it should fire up.

nhowe29:
Which pump? There are two jet pumps and the circulation pump.

And the wet end means the end going into the impeller, correct?

nhowe29:
Oh wow, I can't believe I didn't see that plug. I completely removed the pipe to drain it.  :o Now I know what you are talking about. I'll try that, but I didn't hear any air when I removed the pipe itself.

Sam:
Yeah, whatever pump is airlocked you just remove that plug and let a decent amount of water shoot out.  Sometimes they are stubborn and you need to do that a couple of times.

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