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

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Pilot stays lit, but burners underneathe do not light up or burn.

Please advise us. heater laars lite 2 gas LG model for inground pool worked beginning of this summer. Now pilot stays lit, but no burners come on underneathe. thanks, kathy

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  • kyamada2217 Aug 31, 2008

    Is this a Laars service technician? Where are their troubleshoot solutions? The manual doesn't have solutions.

  • dogsnuts Feb 28, 2009

    i have the same problem and have just ordered a new thermal generator which is being delivered mon so will let you know if it solves problem

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  • 33 Answers

Check pump is working, if so could be stuck flow switch or gas valve fault get unit serviced

Posted on Jan 17, 2010

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2 Answers

My Laars 2 lite pool heater will not ignite, I have the same problem every year for the first ignition. The pilot is lit. I removed the filter to make sure it is not the pressure.


you might need to bleed the line to get fuel to the heater core. If there is a bubble in the line it will prevent the heater from working. Usually, there is a bleeder valve on the heater unit -- unscrew this and let some of the fuel drain out (into a container) and give it another shot. It should light right up after bleeding the line. If the fuel that you took out of the bleeder valve looks clean, you can then put it back in the fuel tank and it should be fine.
If this is a natural gas heater, there will be no bleeder valve -- you should have it looked at by a professional repair person. Natural gas is very dangerous and should only be repaired by a qualified professional to avoid serious injury or death.

May 27, 2011 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Pilot is lit, but burner will not come on. I jumped TH/PP to TH then burner comes on. Pilot generator = 350mV.


More than likely the tempature control is defective, since you effectively bypassed that connection. I found a manual for your unit which shows different types of ignition. I'm not even sure if the millivolt system is covered in this manual. Here's the sight
http://shop.solardirect.com/pdf/pool-heaters/gas-pool-heaters/jandy-lite2manual.pdf

Jul 12, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

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take millivolt reads while main burner is on.i suspect you will see a drop in voltage until you get to point where it will no longer operate burner(around 200mv).if this is the case you probably have poor pilot characteristics due to dirty pilot,pilot out of adjustment ,obstruction or insufficient gas pressure

Jun 21, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Main burner will not light. pilot has now gone out


shut off the gas at the gas **** and gas valve. the pilot tube is held in place by a 7/16 compression nut. remove it then remove the 2 screws for the thermopile "generator". follow the pilot tube and the pilot assembly should be held in by one or two screws. usually you don't have to remove the main burners. hopefully this helps

Jun 14, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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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...

1 Answer

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make sure gas supply is there also clean the thermocouple, if it is fowled or dirty the pilot wont stay lit nor will the main gas valve open

May 24, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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cycling usually begins as the result of poor water flow caised by debris in the pump, dirty filter or low water level. once you have had some cycling the heater burners and ignitor become sooted and this requires pulling the burner tray, de-sooting the burners and pilot and reassembly. unless you are very competent you may want to call a service tech. Pool heater repair is a high laibility endeavor if done improperly. During the certification class our instructor showed us several houses that were burned down from improper heater repair.

Mar 24, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

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First check thermostat is calling for heat or if gas valve fault get unit serviced

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2 Answers

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If the pilot flame is not strong enough, it will not tell the gas valve to open, or if the gas valve is not getting the signal to open, it won't. Check all wire connections at the thermostat and gas valve. Check ground wires. Clean the pilot light and flame rod.

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it might be the hot surface ignitor. a common problem with gas furnaces also. also, check if there is an code on your screen. it will be called an FL code. call the manufacturer.

Aug 05, 2008 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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