Question about Jandy Lx Pool & Spa Heater - Electronic Dual Ignition - Lonox - 400,000 Btu - Natural Gas - Lx400n

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Low pressure flashes when i try to turn on the heater

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Check strainer and skimmer for excess debris that will cause low flow to heater thus not engaging pressure switch.make sure filter is clean.if all of these check out ,take continuity reading on pressure switch.if no continuity,try to adjust pressure switch if it wont adjust ,its faulty.take extreme caution when adjusting make htr will shut down when pump goes off

Posted on Jun 24, 2009

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Air energy electric pool heater shows low pressure, low temperature and will not turn on


low pressure will either be gas or water. technician with a manometer can check gas inlet and manifold pressure. ensure adequate water flow from pump. pressure switches generally close at 2psi. you can jump the pressure switch if you think its faulty, or use ohm meter and check continuity of pressure switch

Oct 03, 2013 | Pentair MAXITHERM 333K BTU PROPANE GAS...

1 Answer

Low pressure indicator flashing and current temp reading missing. Any ideas?


low pressure can mean from either water supply or gas. make sure the pressure switch is closing at 2psi.

Aug 03, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Jandy LX250 natural gas pool heater will not start heating. Turns on but no heat. Low Pressure Flow


if filters are clean check pressure switch see if 24 volts ac on both sides if not check copper line for clog if ok bad pressure switch you can jump just to check

Mar 27, 2012 | Jandy LAARS LX250 - PROPANE, DIGITAL...

1 Answer

Heater has power but flashes code L.P


• The low-pressure switch senses the refrigerant pressure in the sealed refrigeration system to protect

against certain conditions that could be detrimental to compressor life. The switch turns the heat

pump off in the event of loss of refrigerant, fan motor failure, evaporator freeze-up, or airflow

blockage. The heat pump will automatically reset the switch after the system pressure rises to the
normal operating pressure. The display will show "LP", if this switch is tripped.

For more info, look at page 7 on this manual:

http://www.hayward-pool.com/pdf/manuals/Manual280.pdf

Either you need to defrost the coils, clean the air-flow chamber, get a new air-flow switch or you are running low on refridgerant.

Dec 09, 2010 | Hayward Pool & Spa

1 Answer

My Jandy Laars LX 400,000 BTU heater flashes "low pressure". I removed the water pressure switch in the heater and turned on the pump and water flows nicely out of the copper tube for the water 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

Jul 26, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

2 Answers

I have a Rinnai tankless gas water heater and this things beeping and flashing 12 everytime we turn on the hot water the water will get hot but you have to wait for it to stop beeping


Error 12 is failed ignition - this can be caused by many things, but normally a low gas pressure, or no gas pressure upon ignition.
Try turning the hot tap on very slowly till till the control shows burner is lit. Then turn it on faster. If it stays going with no error, you might have a faulty regulator, not opening fast enough to meet demand. Especially common with lpg models,a lot rarer on natural gas.

Oct 27, 2009 | Rinnai Water Heaters

1 Answer

Turn on green light flashes


Count the flashes before a pause. A steady on is bad ground or loose igniter. 2 flashes is either low gas pressure, bad flame sensor, gas valve wires loose or bad ignitor. 3 flashes is a bad pressure switch, or blocked vent. 4 flashes is a bad roll-out switch or open contact. 5 flashes is bad wiring to gas valve or flame sensor, 6 flashes is either a bad control board or bad thermostat.

Oct 13, 2009 | Sterling RF75 Natural Gas Heater (75,000...

3 Answers

Hayward H400 heater problem


LO usually indicates low water pressure. Check the pressure in your filter. You may need to backwash. If the filter is to clogged then the water pressure in the heater is so low that it won't activate the pressure switch. While checking the pressure turn the pump off and then on to make sure the pressure gauge is actually working. Also check the pressure coming out of the inlets into the pool. You should be able to tell if you have sufficient water pressure.

Jan 24, 2009 | Hayward H Series Pool & Spa Heater 400k...

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