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Never try and light a furnace when you have a glow coil ignitor. Even if you managed to do so it would reach high temp and limit would stop it. . trained technician can do this but why? If your glow coil is glowing constantly after start up than mast likely you have a control board problem. Call a technician to troubleshoot it
Try Master Parts, they have All Pro parts. 800.446.1446 or www.masterparts.net . Also, if you dont have a manual check out www.desatech.com under "construction heaters." I hope this helps!
You probably have a klixon/high limit popped out or failed. This video shows were it is on another heater and although yours is different they all have limit switchs thanks to ralph nader. LOL Check this out: HERE
you may need someone to come in and adjust your pressure regulator that is inline to heater this is what controls the output of propane and should only be adjusted by a pro
Check your fuel and air lines for leaks, typically it's the CAD flame sensor but if you have already replaced it try checking the high heat limit switch. It looks like a thick watch battery just behind the combustion chamber, take it off and hold a lighter under it. If it's working properly you should hear a faint click when it shuts off, no click then it's bad.
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