Most all of the torpedo heaters on the market are made by DESA. Repairs are usually not too difficult.
One of the common ones I have seen is the photo cell going bad or just being dirty. Also note that there are TWO different photo cells. If you have the wrong one installed, it will give exactly the problem you describe. A dirty photo cell will cause a similar problem. The safety module allows the heater to ignite and run for a few seconds, but if it does not ''see'' the fire via the photo cell, it will shut down the heater.
Cracked lines are another big problem, but in general, they usually cause erratic operation, refusal to ignite, or will not generate a good enough flame to satisfy the photo cell.
One other possibility is the pump can be worn to the point that it is not generating the correct pressure to keep the heater going. Repair kits for the pump are readily available and fairly easy to install.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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