Posted by Lamont in NC on March 05, 2019 at 13:53:19 from (45.36.228.199):
I have 2 Ready Heater brand torpedo heaters. And older 30,000 btu unit with a spark plug and a slightly newer 60,000 btu one with a circuit board and that glowing igniter thing--both purchased at estate sales. I've used the smaller one for a 2 to 3 years but recently it started tripping off randomly. It might operate for 2 minutes or 30 minutes then it trips off. Heats well when running. Spray pattern looks good. Flame seems good. No spitting, noises, smoke or smells prior to cutting off. I suspected the photo cell was bad so I went to use the larger one. It fires up fine with everything seemingly normal but cuts off within 30 seconds. That definitely sounded like the photo cell.
I removed the photocells and tested them with an ohm meter. They both worked identically. No continuity when dark, 3 to 4 with just shop light (on the 20,000 ohm setting) and .2 with a flashlight shining in them (on the 20,000 ohm setting). I don't know what the values should be but being identical I'd suspect they are ok but perhaps both are equally bad. So I ordered a new one off ebay. Bench tested that and it gives the same readings and no surprise it also gives the same results when put in the heaters. So, I guess it's not the photo cells.
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