Question about Teledyne Laars Laars Lx Pool Heater / 400,000 Btu / Propane Gas

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Laars LX, runs for an hour then turns off with AGS, the top seems to get hotter than normal. checked flame sensor and igniter, they look good. I turn it off then back on and it will turn on then do the same.

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  • Teledyne Laars Master
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Check gas pressure sounds low and is overheating

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SOURCE: Laars Teledyne Pool heater flames on for 2 seconds, shuts off

You have no flame rectification.....LLD series heaters check for a signal through the flame to ground; if the module does not detect this signal, it go through two more trials for ignition and then lock out the module. There should be a flame rod and it may need cleaning. I use steel wool.

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It could be that the Igniter has gone bad. Or it cold be a number of other items, like the gas valve itself. If the heater has a display panel on it, is there an error code showing? If there is, go to your Owner's Manual and find out what the code is for the heater.

If you do not have a manual, you can find one online at the following link:

http://www.inyopools.com/owners_manual/jandy_heaters_lite2.pdf

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SOURCE: Pilot Flame will not ignite

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SOURCE: Teledyne Laars LD250 Propane Pool heater cycles on and back off

Do you replace the thermopile or check the milivolts?
Check the Pressure gas
You need replace all of them terminals and check again the milivolts at the gas valve

Posted on May 29, 2010

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1 Answer

Laars LX 250 AGS Service error. Burners ignite the go out.


if connected 120 volt switch red and black wires its not rectification

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Feb 28, 2012 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

IT TURNS ON THEN SHUTS OFF,DISPLAY FLASHES SERVICE AGS


Per your owner's manual:


AGS

(automatic gas shut-down)


1. Oscillating pump pressure.

1. Clean filter or identify and repair cause of pump oscillation.

2. Low gas supply pressure.

2. Identify and repair incorrect supply pipe size or pipe line blockage.


Refer to qualified service personnel.

3. No flame at burners.

3. No flame at burners. 3. Identify and correct loose wiring connections, or problems with igniter, flame sensor, gas valve, or ignition control.


Refer to qualified service personnel.


For more info the manual is here:
http://www.jandy-downloads.com/pdfs/LXandLT_H02140B.pdf

John

May 29, 2011 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

My Laars LX pool heater would shut off soon after it fires up


This error is Automatic Gas Shutdown. Here is what you can do:

  1. Check for fluctuating pump pressure (air in strainer, pressure guage bounce)
  2. Check all wiring connections
  3. Replace ignitor/flame sensor assembly
Depending on your expertise, it could also be the gas valve or ignition control (aka the IID).

Since the burners do fire briefly, I would suspect the flame sense rod first. Attached is a link to the owners manual in PDF.

Lo Nox heaters can be a little tough so follow the directions exactly.

Jul 24, 2010 | Teledyne Laars Laars Lx Pool Heater /...

1 Answer

Heater will fire, will heat for one hour then shutdown. will get digital read out AGS. can turn heater off, let set for a while turn heater on will heat up for an hour and it will shutdown again.


you didn't indicate exact model but here is what the AGS is for.
Not sure if yours has a combustion blower or not, if so check that it's flow is not obstructed. If it doesn't make sure there are no debries in the flue area. Here is the troubleshooting from their manual. You can download a manual from www.jandy.com
AGS
(automatic gas shut-down)
1. Oscillating pump pressure. 1. Clean filter or identify and repair cause of pump
oscillation.
2. Low gas supply pressure. 2. Identify and repair incorrect supply pipe size or
pipe line blockage.
Refer to qualified service personnel.
3. No flame at burners. 3. Identify and correct loose wiring connections, or
problems with igniter, flame sensor , gas valve, or
ignition control.
Refer to qualified service personnel.

Jul 16, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

What does service ags mean on a LAARS LX pool heater?


AGS stands for Automatic Gas Shutoff. This means the heater failed to sense a flame or flame rectification. When this occurs, the the gas valve will close as a safety precaution. The heater will have to be reset to get another call for heat.

May 18, 2010 | Jandy 131K BTU LAARS AIR ENERGY HEAT PUMP...

1 Answer

I have a Jandy Laars LX Pool/Spa Heater...when I try to heat it cycles three times then tells me to call for service...I feel heat coming out of the vent. The pool/spa is connected to a AquaLinks system...


If the unit is lighting then shutting off then repeating it isn't rectifying, means not sensing the flame. May have a bad flame sensor or ignition control. I'm guessing your AGS is indicated on the GUI also.

Mar 05, 2010 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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