You seem to have left a mixed message, as far as the problem is concerned. However, I think I have figured it out. But, first, let's go through the lighting procedure. To light the PILOT, you turn the Control Knob to PILOT and push the knob all the way in. While holding the knob in, you press the ignitor button. Once the pilot lights, you continue to hold the knob in for 30 to 60 seconds (which allows the Thermocouple to fully heat up), then you ease off on the control knob and the pilot stays lit. Right? Then you turn the control knob to ON and the Burner lights. But, that's not what's happening with your heater.
In a short version here's what I think you meant ... When you release the Control Knob from the PILOT position, the Pilot Flame goes OUT. It never has a chance to light the burner. Right?
If this is the case, couple off things can cause this. First, the Oxygen Depletion Sensor (ODS) is clogged with dust, lint and/or pet hair. Therefore the ODS sensor is reading the Oxygen level as Unsafe for operation. Secondly, the Pilot is dirty and is not allowing the flame to touch the Thermocouple as it should. The way to tell this, is the pilot flame curves upward, rather than being straight and lifts off the Thermocouple.
In addition to the two things I have listed which are the problem 90% of the time, there are 7 more. But rather than list all of them and how to fix the problem, I'm including a link to the Owners Manual for your heater. You can download and print is for now and future reference. Pay close attention to the Troubleshooting Guide. That's where you'll find the other 7 problems and their solutions.
http://www.desatech.com/manuals/Vent-Free%20Heaters/117001-01.pdf
Armed with all this information, I feel confident that you can Troubleshoot and solve the problem.
Please let me know how it works out for you.
Rich, I am having the problem described with the exception of the following: Once the pilot lights, I continue to hold the knob in for 30 to 60 seconds (which allows the Thermocouple to fully heat up), then I release the control knob and the pilot stays lit. Then I turn the control knob to ON and the Burner does not light and the pilot light goes out. Any thoughts?
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