Question about Dayton Gas Furnace Heater
Worked fine for 20 years but has been a problem the last couple of winters. thermocouple has been replaced a couple of times. Do not know what has changed.
If this really is a thermocouple unit with a standing pilot, it must be pre 1978, I would suspect a crack in the exchanger first off as thats potentially lethal, not a joke, many heart attacks, headaches, fibromyalgia etc comes from undiagosed carbon monoxide exposures!
And many die from it sadly as it is 100% preventable, a detector would be advised even if you are ok there. A draft can be from the roof car ruting out or misssing? any dryer, Jennair, bath fan, water heater, stove top and many hvac systems create negative pressure in the home by exhausting air and not returning any or less than removed, as in a leaky supply duct leaking in the attic, the furnace pulls X cfm and returns Z
and fireplaces etc will backdraft. gas valves do get tired too.
Posted on Oct 31, 2012
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Posted on Jan 02, 2017
Make sure all the wire connections are good and tight. Next lift off the cover and look for a little thermal disc mounted up by top of the heat exchanger. Most have a re-set button but not all. If you have this ,by-pass it ,see if that solves the problem, if so it may be defective, or doing its job and you have a venting problem. If you don't have this and have changed the thermocouple (was it a copper tube with a fitting that screwed into the gas valve, or did it have 2 wires, that is a pilot generator, kind of same thing) make sure the probe is set correct, with the pilot flame heating the top 1/3rd of the probe. The only thing left is the gas valve.
Posted on Dec 25, 2007
I had the same problem with a Coleman. The problem is the blower relay. You can find this at http://mobilehomerepair.com
Posted on Oct 21, 2008
SOURCE: thermocouple replacement
Maybe you need to approach it differently. Why do you assume you have a bad thermocouple each time? If its because the whole flame goes out and you have to relite it, a lot of things can cause that.
1 ohm out a new thermocouple and record the ohms reading (read tween the center LEAD looking area on the end going into the gas valve and the outer shell (copper colored cover) If its a MV type controls it will have 2 wire ends. With the flame running now check the MV-DC on the same area, as the resistance. Yes you will need 2 hands extra for holding the flame on. It wont stay on without being hooked up. Typically you need 400MV for a thermocouple and 600 is the stahdardf output on a generator with wire leads depending on which you have. If your below these ranges You need to blow out the piulot area with compressed air and retry it. You should get an increase in the milli volts after cleaning because now the flame will hit the pilot or thermocouple or generator as designed and dust was causing it to be lazy and not get enough voltage back to the gas valve to stay on.
Now this is assuming you have the correct pilot orfice and its not too small like with an LP orfice installed on a NG system. The pressures are differant and the hole is way smaller on LP.
This is a really common problem with multi changeouts of thermocouples. Dusty Pilot burners. y policy has always been to blow it out first after observing the type and kind of flame. Then reexamine it after cleaning it out.
If this helps you please rate me as high as you can. If I have not given you enough information please post back so I can better aquaint myself with you problem. Good Luck!
Posted on Mar 23, 2009
Make sure the pilot is clean (Blue flame fully enveloping the top portion of the thermocouple) if its dirty the pilot will be yellow like a candle and barely touching the thermocouple ...quick fix is knock the pilot with a screwdriver...gently tapping it...knocking the dust out and getting a better pilot....the pilot could also be too small if its not making good contact with the thrermocouple....there could also be an Auxillary limit wired into the thermocouple which when open will prevent the magnet from staying closed....if all looks fine then the Gas Valve itself is likely gone (The magnet inside is not field repairable)
Posted on Oct 25, 2009
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