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Laars LX Pool Heater ,blower turns on & off,no heat AGS sign comes on.Any ideas

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I had to replace both hi limit sensors in mine. The sockets that they fit into has a plug inside that corrodes and allows clorine water to escape. I had to put the plugs in with auto gasket sealant around threads only. This solution helps but the sensors should be inspected now and then for corrosion. Lithium grease on electrical conectors on the bottom of sensor helps to. This area is attacked by corrosion big time along with top. (winterizing) On low pressure switch inside the heater the copper tube must be undone on switch or undrained clorine will clog up lower tube with corrosion. This blocks low pressure switch from working. Then you have to cut small piece off and redo the tubing. Been there done that. For the most part the Laars hasnt been a bad pool heater but the hi limit sensors along with the plugs could have been engineered better. Good luck and watch the ph...StLouis

Posted on Aug 28, 2008

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1 Answer

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


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Nov 17, 2012 | Jandy Laars Lt 250,000 Btu Heater

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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.

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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.

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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.

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