Question about Jandy Laars Lt 250,000 Btu Heater

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Jandy LT/LX 400,000 btu leaking water from high limit

Jandy LT/LX 400,000 btu in ground pool heater is leaking water from 150 degree high limit sensing port. I removed the cover plate to the limit switch and noticed that there are 2 ports where this sensor can be installed, the sensor was installed on the right side port, and the left side port has a small brass piece that looks like a slotted screw head, this brass head came off the manifold and I believe that this is where the water is leaking from. After carefully examining the part, it appears to be some type of transducer that the high limit makes contact with while sitting in the chamber. It does not have any threads but I can't understand what was holding this piece in as the other side of the brass piece has pump pressure on it (heat exchanger side), perhaps it was some type of adhesive). anyway does anyone know whether this can be replace or does the whole manifold have to be replaced?

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Posted on Jan 30, 2016

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SOURCE: My Jandy Laars LX 400,000 BTU heater flashes "low pressure"

Once you try to ignite three times in succession, and the heater doesn't sense the presence of flame, the heater goes into "lockout" mode and must be reset to fire. This can be done by pressing and releasing the mode button so that the heater is turned off then returned to the desired mode. So if you were going to "jumper" the pressure switch, (connecting two wires together) make sure you do the reset also. Make sure you don't operate like this, if your pump quit, you could have a melt down. Also If you have anything connected to the fireman switch, it is in series with the pressure switch,and woud display the same thing. There is a terminal with two white wires, if there is a jumper there, then nothing conected, but if there is something connected, make sure it is closed. Also be sure your code was for Water pressure and not air pressure switch. You can download manuals at: www.jandy.com

Posted on Jul 27, 2010

  • 19 Answers

SOURCE: My jandy LT heater leaks water out of the

I have the 250000BTU version but I believe they are the same in this regard.

It is far more likely to be simply that the low pressure detection copper line sprung a leak or is loose and perhaps dripping onto the limit switches. In and around the same area as the 2 hi-limit plugs is a small flexible copper tube (like for a refrigerator water line). Check that connection for a leak. The other end of that pipe is in the wire chase above the front panel. If you need directions on how to open either panels just ask.

Posted on Sep 20, 2010

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I have the 250000BTU version but I believe they are the same in this regard.

It is far more likely to be simply that the low pressure detection copper line sprung a leak or is loose and perhaps dripping onto the limit switches. In and around the same area as the 2 hi-limit plugs is a small flexible copper tube (like for a refrigerator water line). Check that connection for a leak. The other end of that pipe is in the wire chase above the front panel. If you need directions on how to open either panels just ask.

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