Question about Lite On Laars Lite 2 Heaters: 250,000BTU MV Heater

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Laars model# LG125n-c having problems with heater , pilot stays on but heater will not kick in. Could it be my thermolcouple? or my pressure switch? Natural gas 125,000 btu's for above ground pool

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Could very well be thermocouple or fan switch if you have a meter that reads millivolts you can check thermocouple output or fan switch for continuity if you jump out fan switch be careful cause you can go boom if you are not familiar with this type of equipement you should call someone who is

Posted on May 11, 2009

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Laars Pool Heater, pressure valve or something else,


bad pressure switch or incorrectly set should have no continuity when off it should when running put on 2000 for ohms should have 500 millivolts when off then turn on and it will start counting down at about 200 should light make sure all connections are good and all safety circuit is good

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Convert Laars lite model lg125n to LP gas


That involves changing out the complete burner tray including the igniter/pilot assembly, burners and the gas valve. It runs deep into the cost of a new heater, (well over $1000, not installed).

Nov 27, 2013 | Teledyne Laars Laars Lite 2 Pool Heater...

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Teledyne laars natural gas model 125... intermittent firing..would fire when you gave it a sharp whack on the side.... not firing at all now...went through trouble-shooting in manual...bypassed pressure...


Two things, One you may have a low gas presure problem causing a bulid up of soot on your pilot, this will be a small ball of soot on your pilot and can be seen with a light and a mirror. when you hit the heater you cause it to move and the burner will start. If you just reach in with a screwdriver or something and clearit it should start but you should have your pressure checked and have the problem fixed or down the road it will cause other problems. Or if you live in the right (or wrong) aera of the country you could have spider webs in your gas orfaces and these can be cleared with a bent wire inserted into the orfaces. This is a problem that will reoccur as these are hard to control. Try these and see if they help and let me know how you do. good luck.

Oct 21, 2009 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

Convert Laars lite model lg125n to LP gas


i dont have a solution, but i would like to do the exact opposite. I would like to convert a lg125 from lp to natural gas. have you learned anything?

Jun 02, 2009 | Teledyne Laars Laars Lite 2 Pool Heater...

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Hi you will need a gas fitter to do this and set it up

Jun 02, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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This happened to me and the tech came out and change the pressure switch and it worked fine afterwards

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i'm having the same problem. I thought it was due to having to put some non-detergent oil in the siphon loop, but that doesn't work either....i'm still having the same problem...will not kick on!!!!

May 04, 2008 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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