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Have a cozy challenger floor furnace (that is a 24v/millivolt induced from thermocoupler) replaced thermocoupler. pilot light lights but burner will not come on. what's next?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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hotuna
  • 288 Answers

SOURCE: cozy wall heater lights fine then goes out after 3 or 4 minutes

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

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geokohler
  • 304 Answers

SOURCE: thermocouple

I am assuming you are talking about a type K ( Chromel, Alumel ) type Thermocouple. A junction of these two alloys ( welded together by capacitance discharge) produces 41 micro volts per degree Celsius. As the flame from a perfect air/gas mix produces a flame around 1900 C (propane), and 2000 C (natural gas) . You can simply multiply.

41uV X 1900 = 779mV For propane
41uV X 2000 = 822mV For natural gas

This should give you a pretty good Idea of what you should be looking for. If you are using a standard volt meter to obtain a reading. Touching the leads of the probe to the leads of the meter in affect creates two more thermocouples unintentionally. This will alter your reading only slightly due to the fact that the temperature will be at relatively negligible at the contact points.
Allowing for this distortion you should expect a reading +/- 50mV either way. I hope you find this information helpful. Please take the time to rate this fixya for me. To compensate me for the 4 years of my life I spent cramming weird stuff like this in my head in college and the 5 minutes I spent typing this out for you for free. LOL If you ever need my help select me as one of your experts and I will help you for free.
George

Posted on Jul 28, 2008

farfield
  • 462 Answers

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

heatman101
  • 43501 Answers

SOURCE: Coleman Gravity Floor Furnace need millivolt gas valve & pilot ki

Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

Posted on Nov 12, 2009

shastalaker7
  • 1515 Answers

SOURCE: Cozy wall furnace burner will not light. Pilot

Hi, have done this to many times not to know. I will walk you through this. It is good that the pilot is lit. Go to the stat and remove cover. Don't worry as this is a milivolt unit, no voltage or such a small amount you wont even notice as this is why it is called milivolts.Take a small screw driver to remove the next section which is the thermostat and will expose the sub-base where you will find 2 wires connected to it. You may have 2 or 3 screws to take loose to get to this last section. Anyway, if you have a piece of insulated wire laying around, even old speaker wire will work, take it and touch the wire across the 2 terminals and hold. If the furnace comes on, the thermostat is faulty, and you will need to buy a new one. No power to shut down, and simple to change. Cost about $12.00 dollars. Try and get a heat only milivolt stat as they are much less expensive and will have less problems with them. Go to home DEPOT to get one, or O.C.S.H. will also carry them. Don't let the salesman talk you into buying a programable heat and cool stat, 24 volts as they will work, but cost more and you don't need it!! Look around even if you need to go to a wholesale Refrigeration, Air Conditioning, and Heating parts house. Tell them you need one for a unit in some apts you own, and you will pay cash as you want a cash account. They will only ask what job its for, and just tell them your name. This is not illegal and I wouldnt tell you this if it was!! You will still have to pay taxes but will get a wholesale price for it. I am sure it will fire up when you touch the 2 wires and prove stat is bad. For some reason it is not the stat, follow the 2 wires from the stat down to gas valve and jump the same 2 terminals there also. If it fires up, you will have a problem in the wires from the stat to heater and will need to be replaced. I don't think this is the case. But, on the chance it will not fire after you have done all of the steps I have had you do, then you have a faulty main gas valve(MGV) and will need to replace. This is all easy to repair.I am a 100% sure it will fire up when you jump the 2 wires together, and you will need the stat. Please let me know as I will be waiting for an update! Good Luck,
Shastalaker7
PS When you install the new stat, make sure it is Level.

Posted on Dec 18, 2009

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1 Answer

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So are you saying the pilot stays lit, but the main burner won't always fire. If this is a millivolt system you could have a weak pilot flame, not getting the pilot generator hot enough or you could have a weak pilot generator. If you are handy you can try cleaning the pilot. It may be better for a qualified service tech.

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The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

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I AM WORKING ON A COZY W501E WALL FURNACE AND CANT GET THE PILOT TO STAY LIT. i HAVE CHANGED THE GAS VALVE, THERMOCOUPLE,AND THE SENSOR FOR THE HIGH LIMIT. THE PILOT WONT STAY LIT.


Pretty much the only thing that will do that is the thermocouple not generating enough voltage for the valve to say it's OK.
Usually you need to hold the button for pilot lighting for 60 seconds. You can use a meter to check that it's generating enough power. The thermocouple has to be in the pilot flame properly.

Check this video:
https://www.youtube.com/watch?v=suen7QlJl4o

Gas furnace will not light Thermocouple test with the multimeter

Or see this site:
How to Test Thermocouple with Multi Meter Heating and Cooling

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My cozy floor furnace wont come on


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Coleman Gravity Floor Furnace need millivolt gas valve & pilot ki


Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

Nov 12, 2009 | Heating & Cooling

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Pilot light won't stay lit.


most common cause of the described symptom overheating the thermocouple! a thermocouple produces millivolts of electricity based upon a differential of temperature between the tip and the base. If it gets too hot it will not work correctly. If the pilot flame is too large or the main burner flame is contacting the thermocouple or the thermocouple is too cheap or old all can cause this issue.

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