Hi All. I have a LD400N natural gas fed heater on my 26k gallon pool. 12th season here in PA. Heater will not startup and stay lit. I suspected the pressure switch because I had to load the loop up with oil last year to get it started, which I did again this year but it did not result in normal operations. I bypassed the pressure switch and got the electronic ignited going followed by the "click" and one quick ignition of the burners which only lasted a second, nothing sustained.
First off, is there a proper way to add oil to the siphon loop? Can I use household 3 in 1 oil?
Second, with the pressure bypassed, shouldn't I get normal start up or is it obvious I have something else wrong? Not sure if the PS provided some other cut out signal to prevent operation.
I'm going to go home and make sure there is water flow through the loop to the PS. I had to deal with a filter grid problem at startup and there was loose DE in the system. I get a sucking sound when I disconnect the loop connector now, without the pool pump running.
Any ideas or insights would be greatly appreciated.