mdwheaton

My symptoms are I have ONLY the power light, no other lights light. My thermistor was cracked and there were burn marks on the board. I replaced the thermistor, no change. Even when I disconnect the RJ11 for the flow switch, there is still no change, not even the "No Flow" light lights. I checked the voltage into the rectifiers, all good. I checked the output voltage from the rectifiers, all good. I checked the resistance on the transformer, all good. The display shows 2600 always...instant salinity reading is 0.00. The two thermistors on either side of the power input "look" ok... What to check next?

Doesn't the "no flow" light come on? Alternatively, you could wire the power to the generator to only work when the pump is running.

I have a Laars/Jandy LT400n-l. Installed in 2003. Up until the last week, it seemed to work fine. About 5 days ago, I noticed a large amount of soot on the fence that the heater in installed near. I started paying more attention, and I notice the exhaust gas is really HOT. I'm not sure how hot it is supposed to be, but if you hold a piece of paper in the exhaust stream, it will turn brown nearing ignition. I planned on heating the pool for Christmas, so I let the heater run overnight, and all seemed to be OK, until last night. The pool reached the set temperature and turned off like I expected, except now it won't re-light. Before, when it would go through its lighting cycle, I would see the orange glow from the HSI in the little sight window. Now, there is no orange glow, and no ignition. I'm having trouble figuring out where the HSI is mounted so I can inspect it. Is it a major dismantling operation to check this part? What should I expect for exhaust temperatures? Does the sooting sound like a problem? There is a lot of rust down around the burner openings. How long should I expect this heater to last? I'm fairly handy, but I don't want to get in over my head. Any help greatly appreciated! Sincerely, Matt