SOURCE: my laars lx pool heater is blinking LOW PRESSURE.
The heater needs good water flow or it will overheat. You probally have a full basket in your pump or your filter is dirty.
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
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check filter pressure gauge ,higher than normal can cause lower flow to heater. pressure switch in heater will not open to allow call for heat
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