20 Most Recent Desa International TD104 Patio Heater Questions & Answers

Sounds like you may not be getting enough gas up to the main burner. Bugs, such as spiders, love to make homes out of the main supply lines. Does your pilot light burn blue, and strong? If not, it may need to be cleared of the obstruction. Also, when opening the the gas tank valve, are you opening it slowly?

http://www.fixya.com/support/t26881969-vanguard_ventless_heater_won_t_shut_off Feb 7, 2018 - If it does not work for you, you will need to replace the gas valve. It's expensive but I'm about positive that cleaning it will fix it. ... Hi it is blue with a slight yellow tip ... at www.desatech.com , then go to "Wall Heaters" then click your model ... I fixed this by dismantling the fire and right next to the control knob ... Gas wall heaters vangaurd model VP2600C 10 answers Jan 31, 2014 SOLVED: I have a vanguard propane wall heater, 5 ... 2 answers Jan 6, 2010 More results from www.fixya.com

If it's a direct spark ignition type heater maybe that's how it's designed to.work .When called for heat pilot open allowing gas then ignitor spark and ignite the pilot then gas valve open and allow gas through burner then unit fires off .
Once temp is met pilot valve closes and pilot out .

Try cleaning the gas tube with a pipe cleaner and insure the flame is in contact with the thermo coupling.

I have same model, went to all parts.com and ordered pilot assembly for 105$ , has all in one kit. Part # 108084-02 easy instal Good luck