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

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Service AGS Heater lights and as soon as the fan turns on high it shuts off. it runs for about a 20 second cycle. Heater reads Service AGS.

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  • sonjabihary Jul 12, 2009

    Just to clarify the heater is natural gas and not propane. Replaced gas valve and cleaned flame sensor. Fan is running before, during and after. Isn't showing any other codes except service AGS. Gas turns on, starts to heat, when fan kicks on high the flame shuts off.

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I have had this problem more than once over the years. The first time I found cleaning the igniter rod by lightly sanding it with an abrasive cloth or sandpaper corrected the situation. The second time was one that I really struggled with, as it would sometimes work after moving wires around. I finally found the solution had nothing to do with the heater itself, but was due to a loose ground wire in my timer box. Cleaning and reconnecting the three ground wires was all it took. I can't tell you how long it took me to finally find this solution.

Posted on Aug 04, 2013

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Hi there,

It seems that there is a relay problem or the fan condenser.
so, do check them first.

Good Luck!!

Thanks

Posted on Jul 12, 2009

  • Mukesh Kumar Jul 13, 2009

    It sounds as if the ignitor has failed. It is about an 80 dollar (or so) part for your heater. Before the gas valve opens, you should see an orange colored glow in the burner area. 


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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.

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RUUD heater


Sounds like a dirty flame sense rod. Be sure to shut off power before removing the rod and cleaning it with sandpaper or steel wool. Do not touch or disturb the hot surface ignitor or you may cause it to fail.

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