Laars lite 2 LG or LD Pool Heater- Heater won't stay on

check the ignitor turn power off disconnect (remember where they go ) ohm out should be about 78 ohms if not replace ignitor also check the fuses

Yes

Problem with the thermocoupler its not producing a minivolt of 250 plus that is needed to open the main gas valve

http://www.laarsman.co.uk

Miles

It sounds like your pool heater might have a defective controller (the part, not you). Check the controller and replace if necessary. It could also be that you need to cycle the ignition sequence until the air is out of the gas line. It could also possibly be that your gas valve needs to be replaced.

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

this may tell me you dont know if the ignition control is not working. see the owner manual at jandy.com

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.

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