The problem is not the heater. When was the last time that you cleaned the pool filter? Low or no water flow - no heat. Low flow = dirty filter or plugged pump or skimmer baskets.
Ken
Use the link below to look at a Laars manual to see if one is included.
I cannot find a current listing for Teledyne Laars. As far as I can tell, Teledyne and Laars separated, Laars joined up with Waterpik and then got reorganized under Jandy. www.jandy.com now has the Laars Lite2 line of pool heaters with the LG model almost identical to the Teledyne Laars LLG. You can access the manual at http://www.jandy.com/pdfs/H02359-.pdf . Jandy also has a parts list for older discontinued models.
Try this link www.jandy.com Ken
Check that you are getting voltage from the thermocouple. You should see about 600 millivolts.
go to their website and support and download it
You might want to try Jandy.com k
You can find every part you need for your boiler at gasboilerspareparts.com
Try google Jandy.com
The BTU output of a Teledyne Laars Series 2 residential heater can vary depending on the specific model. Generally, these heaters have capacities ranging from about 30,000 to 150,000 BTUs per hour. For precise specifications, it is best to refer to the product manual or manufacturer's documentation for the exact model in question.
Possible reasons why a Teledyne Laars Phase 2 pool heater may not ignite include issues with the pilot light, gas supply, or faulty igniter. Check if the pilot light is lit, ensure there is proper gas supply to the heater, and inspect the igniter for any signs of damage or malfunction. Additionally, check for any error codes on the heater display panel that may provide further information on the issue.
it makes sure the heater is shut down BEFORE the pump does. It is very important if the heater runs without the pump running the water will boil in the lines and burn out the heater. I know this because my electrician didnt wire mine correctly and that's what happened to me. BYE BYE 2,500 heater
Write or inquire thru that web site for a manual to be sent to you. k