HVAC Questions? Ask an HVAC Expert for Answers ASAP
Hi, Tom here.
Does you DLX 28 have a thermostat or is it manual control?
Let me know,
The thermocouple you have is what is called a pilot generator. It produces the voltage to operate your gas valve. It has to be producing 600 -700 millivolts d.c. for it to operate. Since this is way less than 1 volt, it needs to be in good tune to work.
It will look similar to this.
The first thing you need to do is look at the pilot flame itself.
It needs to envelope the entire end of the pilot generator.
Look for a good crisp blue flame. If you have a lazy yellow flame that curves upward and doesn't envelope the end of the generator, it will not heat it sufficiently to produce enough voltage to hold in the pilot valve.
If that is the case, a good cleaning of the pilot burner is in order. Use a small stiff brush, some folks have used a pipe cleaner and some compressed air to clean any dirt, soot , debris away from the pilot orifices.
This should take care of it. If not, you may have a faulty pilot generator. I would test the output of the current pilot generator before replacing it. It would require a decent digital volt meter capable of reading dc millivolts. If you are not able to test it, replacing it would be the next step. A faulty gas valve would be the last option, but fairly rare compared to the pilot issues discussed above. A fireplace shop or maybe even a decent hardware store should carry a new pilot generator.
Check the easy stuff first. Let me know if you have further questions. Thank you!
To make sure we are on the same page,,,thermocouple produces about 30 millivolts, a pilot generator abou 6 - 700. Does your thermcouple have leads or does it screw into the gas valve body?
Yes, we are almost on the same page. A pilot generator will have 2 wires to connect to your gas valve. The thermocouple is a somewhat stiff copper tube with a nut on the end that simply screws into the gas valve.
It is possible that the pilot generator is getting weak. They do that. I always check 'open voltage' which means I disconnect it from the valve altogether. Put my volt meter on the 2 wires and then light the pilot. You'll have to hold the knob down and watch the voltage. It takes about 3 hands and a little luck. Or a couple of jumper wires.
Anyway, when up to full temp, the generator should be making 600 -700 millivolts with 'open voltage' not hooked up to the valve. Anything less than that is going to cause you trouble and should be replaced.
Thanks for the good questions. I hope you get it going.
No, not much. Pilot generators are all about the same. Take your old one along, just to make sure it is about the same size.
I think you can reply to these posts for about 30 days, so feel free to reply if you have further questions.
Thank you for the accept, I will leave positive feedback.
Yes I did and thanks for the bonus!
I understand about the site. The first time I used it to get advice on my Chevy van I was totally confused. Second time, much better. Just have to figure out the quirks I guess. That is why I'm pretty upfront about not paying until you get an answer that is helpful.
Thank you again. Tom
You're welcome, same to you and yours.