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LX2000 gas furnace. It starts and runs for about 5 seconds, then why does it shut off?

Replaced the thermostat and thermocouple

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Claude Kayser

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  • Master
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Fix Furnace Flame Sensor (Flame That Goes Off) - YouTube

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https://www.youtube.com/watch?v=fBJ3r9MUa-U
Nov 29, 2011 - Uploaded by RochNoure
A Furnace Flame Sensor is a safety device that reads the temperature and ... easy fix, but the furnace is ...

Troubleshoot the ignitor of the Rheem RGDA model gas ...

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https://www.youtube.com/watch?v=Bx1pXONg2Oc
Dec 12, 2012 - Uploaded by grayfurnaceman
Troubleshoot the ignitor of the Rheem RGDA model gas furnace.... Jun Sim 5 months ago ... My lennox ...Missing: lx2000

Rheem Criterion II No Heat - YouTube

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https://www.youtube.com/watch?v=yOSk6qvpWbA
Jan 7, 2010 - Uploaded by Work12Progress
Rheem Criterion II gas furnace model # RGPH-07EAMGR. When a call for heat is made t wo green led's ...Missing: lx2000

Heater will not kick on unless... [Archive] - Self Help Forums

www.selfhelpforums.com/archive/index.php/t-2153.html

Oct 19, 2004 - 25 posts - ‎9 authors
After a certain amount of time of not running, the heater will refuse to kick back on. ... 2 flashes, then a 2 second pause = pressure switch is open. What do .... On LP gas furnaces, the spark starts and the gas valve opens. ... Buffing them up with a little steel wool (5 minute job) is a good annual PM thing to do.

Posted on Dec 16, 2015

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5 Related Answers

Anonymous

  • 42 Answers

SOURCE: No heat, trouble shooting light has continious flash.

There is a vacuum sensor on most units tied from the exhaust gas fan to the sensor. Does the unit try to start? If the unit's exhaust fails to pull the switch it will turn off after about 30-45 sec after starting. "IT" thinks it's not exhausting and stops to keep from overheating. Do you have this exhaust fan and rubber hose to sensor? Can you see if that fan is turning on start?

Posted on Nov 10, 2007

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Ken Bledsoe

  • 306 Answers

SOURCE: Coleman Propane Furnace Good pilot light but feed/ignite main burner

If you have a volt ohm meter take the two leads off the gas valve and ohm out the connection should have resistance for the coil. You said you have 12 volts from the thermostat white and red in the heating mode you should have minimum 26 volts. If you want to check the transformer should have 28 volts. Almost sounding like the transformer is getting weak. You can get parts for a 20 year old unit at any HVAC parts house. Try Washer Specialties here in Wichita Kansas they are on the web. Lowes even carries Transformers. Has to be rated 120 volt primary side secondary side 24 volts and 40 VAC.

Posted on Nov 24, 2008

farfield

Farley Redfield

  • 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

Anonymous

  • 288 Answers

SOURCE: Goodman furnace burner ignites then shuts off in about 10 seconds

if you have replaced the flame sensor and it will not stay lit, the draft safety switch may be opening. It works on positive and negative pressure created by the inducer fan motor.You may have a restriction in your heat exchanger or if is a high efficiency furnace, it may not have the drain tube installed properly with a trap. The trap works just like the trap under your sink and if water isnt in the trap, the pressures can be effected enough to open the draft switch(some call it an air pressure switch)

Posted on Jan 07, 2010

Therinnaiguy

Chandler Ede

  • 1420 Answers

SOURCE: Amana Air Command 80 SSE gas furnace will not stay running

In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.

Posted on Mar 14, 2010

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If the pilot go out on a furnace would gas continue to flow to the pilot , or would it shut off with in a few seconds


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see this causes and fix it. God bless you
o light the pilot on a standing-pilot (always on) ignition system, follow the lighting instructions located near the control. Otherwise, try these steps: Light the pilot:
  1. gasfurnace1.jpg Press and hold the pilot control knob to start the pilot. Set the control knob to the pilot position. Hold a long match under the pilot gas port.
  2. Press the control knob; the pilot should light. Hold the control knob down until the flame is burning brightly (about 30 seconds). Release pressure on the knob, and turn it to the on position.
  3. If the pilot goes out when you release the control knob, try relighting, holding the control knob down longer. If the pilot again goes out, check the thermocouple (below).
Adjust the pilot:
  1. Remove any cap covering the pilot adjusting screw on a combination control.
  2. Turn the adjusting screw counterclockwise to increase the flame or clockwise to decrease it. It is correctly adjusted when the flame envelops the thermocouple bulb by 1/2 inch and appears dark blue with a small yellow tip.
Test and replace a thermocouple:
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  3. Set a multimeter to the DVC (lowest voltage) scale.
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  6. If there is no reading, you will need to clean or replace the thermocouple following steps 7 through 11.
  7. Release the control knob and shut off the main gas valve on the gas-supply pipe that leads into the burner. Shut off power to the burner at the electrical service panel .
  8. Remove the thermocouple from its mounting bracket.
  9. Wipe the combination control clean and install a new thermocouple, tightening it by hand, then give it a one-quarter turn with a wrench.
  10. Insert the thermocouple into the pilot bracket, being careful to not crimp the tubing.
  11. Turn on power to the furnace and relight the pilot (above).
Adjust an adjustable burner air shutter:
  1. Set the thermostat to its highest setting to keep the burner running. Once the furnace has heated up, remove the burner access panel and loosen the locking screw.
  2. Open the shutter by turning it to the right until the blue base of the flame appears to lift slightly from the burner port surface. Then close the shutter until the flame reseats itself on the surface.
Clean removable burner tubes and ports:
  1. Shut off gas and power to the furnace.
  2. Unscrew or loosen and remove the tubes from the supporting bracket.
  3. Carefully clean the tubes with a brush or vacuum, making sure not to damage the burner ports.
  4. Use a stiff wire to clear any debris from clogged ports.

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Why does pilot light turns on gas burner only to have it go out about 10 seconds later? 30 to 40 sec later repeats,without lighting. What is problem? once in awhile, it will light..not often. The burner...


Hello
Sounds like the thermocouple is going bad.The thermocouple is a thin tube that runs from the pilot lite to the gas valve.
What it does is it sences the heat from the pilot lite and keeps the gas valve open to allow the pilot to stay on.
This can be easily repaird by shutting off power and gas to your heater and removeing the thermocouple from the gas valve,then unclip or unscrew it from the pilot lite area.
Any plumbing supply store or home depot or lowes should have these.

Once you get a new one,install to gas valve and pilot lite area then turn on power and gas to heater and follow pilot lighting procedure,you may need to hold gas on for 60 seconds.

Here is a picture of the thermocouple so you know what to look for.


http://thermocatalytic.com/Thermocouple.JPG
http://homerepairgeek.com/wp-content/uploads/2010/12/furnace-thermocouple.jpg

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