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etiger1 04-09-2007 02:24 PM

Pilot Light Won't Stay Lit
I have a Rheem unit model #RGDA-075C-ER. The other day I noticed that the pilot light had gone out, so I spent about 30 minutes trying to get it re-lit. When I pushed in the button the pilot would light but then would go out as soon as I let go. I held it for over 1 minute each time. After doing some reading online, I heard about the thermocoupler. So I went back up and lit the pilot and slowly blew the flame over into the direction that I thought the thermocoupler was located. Believe it or not this worked and the pilot stayed on but for only about 10 seconds after I let go. This was long enough for me to turn the unit on, and it fired up. After the house got to the correct temperature it turned off the unit and the pilot light went out. So does anyone have any ideas? I am wondering if the Thermocoupler just needs to be moved over or adjusted, maybe it is not close enough to the flame. Does this happen? I mean it has worked fine for years now. If you think I need to replace the thermocoupler, please describe where it is located. I have provided a link below to some pictures of the inside of my unit so you know what I have. Also, let me know if it is something that a Home Depot would carry.

Finally, I did have the meter at my outside gas main replaced a few weeks at first I thought that there was just air in the line, however, after the unit ran for 30 mins and I still have the problem I do not think that is it anymore. Also, all of my other gas run items are working fine.

Thanks for any help in advance!

Pictures are at the link below in the HVAC album.

harleyrider 04-09-2007 03:28 PM

Great pics.......The unit has a limit hooked to the t-couple and that could mean something but for the time being change the tcouple and remove and clean the pilot......also make sure that the filters are new.

etiger1 04-09-2007 06:26 PM

Thanks for the the tcoupler something I can get from Home Depot or do I need to go to a HVAC supply store? I assume that I can get the right one by bringing my model # with me.


harleyrider 04-09-2007 06:31 PM

get a universial 36 ' honeywell, leave any extra coiled up, and DO NOT OVER TIGHTEN....snug and then 1/4 turn at the most.

glenbailey 10-19-2009 03:33 PM

Pilot stays lit, furnace runs, pilot goes out.
Similar to the previous post, pilot stays lit until the furnace runs. When it reaches temp set on thermostat the system turns off. Aprox 1.5 minutes later the pilot goes out. Is that still a thermocouple issue?

Model: Lennox g12q3-110-3
Installed in May 1984. Yeah, I know - it's old! :)

TJ_in_IL 10-19-2009 04:29 PM

If you have not changed the tc since '84, most lkely the problem.

SKIP4661 10-19-2009 05:33 PM

You will need to clean that pilot orfice also. If the flame don't reach the thermocouple it won't stay lit.

glenbailey 10-19-2009 07:09 PM

Thanks! Looks like I'll be replacing that tomorrow. Nice that they're only $10!

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