Question about Jandy Laars Lt 250,000 Btu Heater

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My Jandy Lars LT fires up fine for the pool or Hot tub. However, for the hot tub, it will only get to 95º even if i set it to 100. It then shuts off & won't come back on at all until cooled down completely, or if it does fire up again it is only for a minute or so. I'm not an electrician, but if it is something simple, I can probably handle it. Any advice would be greatly appreciated.

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This unit uses dual thermostat and electronic temperature control.
Testing the thermostats to reveal a 5 or 10 degrees gap is quite difficult (it is easy finding out a broken thermostat), and such a small error gap lets think that the problem is not the thermostat but the electronic control.
You can take a chance replacing the thermostats and then the electronic control. I think that in this case the job should be better done by a technician. The difficulty in this case is not replacing parts, but testing them. The fault is uncommon and probably caused by an electronic control. An on-site technician may spot some clue of a different problem before replacing the electronic control.

Here a part seller:

Posted on Sep 27, 2010


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