Pool and Spa
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Was anything in particular done before this issue started? Any pumps replaced or anything like that?
Yes, sorry for the delay, I'm on and off the computer during the day so I won't always be available right when you post back. And the problem started After you had replaced them, or before? Also, when you're getting the HL code, is the tub or the heater assembly itself actually overheating, or are they at normal temperature and just showing the HL code like it THINKS it's overheating?
It sounds like your pressure switch might be sticking closed momentarily after the pump turns off, which will keep the heater engaged causing the heater tube to overheat quickly. The only way to test this is you'd have to be sitting there when the spa reaches temperature or unplug the pump from the pack during the heating cycle and see if the heater stays engaged, usually you'll hear the water start to pop and boil in the heater tube if that's what it's doing.
You normally need to hook a meter up to it so you can tell when it's opening and closing. . The adjustment is almost always on the top center of it. Most are adjustable with a screwdriver, but I'd need to seea picture of it to tell for sure. And I wouldn't adjust it at all until we confirm that's what's happening with the over heat conditions.
Well, if the pressure switch is working correctly, the heater should turn off the second you pull the plug, so no. Now if the switch is sticking, then yes, it would overheat and trip the HL immediately.
ok, then that rules out the pressure switch as the problem, unless it's just sticking randomly, but the only way to determine that would be to sit in front of the spa pack until it reaches temp and see if the heater still stays on long enough to overheat, but that could be a hit and miss proposal since you said it doesn't do it all the time. Random acts like what you're experiencing can be tough to isolate until it does it every single time. You could try replacing the pressure switch with the assumption that it's sticking sometimes, but we'd still be guessing . With a high limit sensor already installed, we're down to either the circuit board showing a HL trip when there's really on over heat condition, or the pressure switch is sticking just sometimes. I would try the pressure switch before replacing the board as that's the least expensive repair at this point.
Sorry, I never saw your last post until just today, you really shouldn't need to adjust the pressure switch, but if so, you'd want to adjust it for less pressure, but in doing so, it needs to be checked with a meter to make sure it's still opening up when the pump is turned off. I would be curious to see what it ended up being if you had narrowed it down. If you still need help, just let me know, if not, if you could rate me on your end to close out the question, that would be great. Still around if you need more help though, thanks, Jeff