Question about Air Conditioners

1 Answer

I have a sears forced-air furnace that automatically lights. It will go on when I first turn up the thermostat. It burns and produces heat for about 10 to 15 minutes. Then the burner goes out and it starts blowing cold air. At that point it goes into an endless cycle of the igniter firing, no gas being supplied to the burner, and then igniter firing again. I have changed the filters... Larry

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

You probably have a bad Thermo-couple . It is a copper looking rod that sets in the flame of the pilot lite It also has a copper wire that goes to the main valve and connects with a 1/4-3/8 nut or a metal clip. The purpose of this part is to tell the computer that the flame is lit and all is good, but it fails often with the same symptoms.
Be very carefull not to touch the white ceramic igniter, for it will fall apart and that will cost you 40.00 bucks to replace. The last time I replaced my thermo coupler on my furnace, it cost 9-10 bucks and most hardware or heating supply will have it.
. But remember use the proper tools, don't just grab any old pliers, look very carefully and u will be ok.
good luck, mule460

Posted on Oct 17, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My thermostat will start the furnace, but the fan will not work.


If it's an older forced air unit furnace, it's likely the inducer motor has malfunctioned. They usually make a lot of noise before they fail, but occasionally they just stop working without warning.

Mar 06, 2015 | Honeywell T87N1000 Round Thermostat

1 Answer

My furnace works on ac and blows on ac but on heat it does not blow but i hear a humming sound coming from the furnace


Most furnace operating on Oil or gas will heat the combustion chamber before starting fan to prevent cold air draft at start-up, can last a minute or two. Eiter the main flame does not come on or the chamber thermostat have fail. Try to modify fan option on room thermostat from auto to on. Cold air coming out: burner problem or no more oil or gas, warm air: burning chamber thermostat problem, leave room thermostat fan option to on until repair.

Jan 02, 2014 | Comfortmaker Air Conditioners

1 Answer

Auto fan does not start electric furnace


see this causes and fix it. God bless you
If the furnace won't run, check the electrical service panel for a blown fuse or tripped breaker. Also make sure the power switch on or near the furnace is turned on. Check the unit for a reset button and try it. Some units have a built-in breaker or fuse panel.
If there is not enough heat, raise the thermostat setting five degrees to see if it turns the unit on. If the unit still does not generate enough heat, check the comfort controls . Clean or replace a dirty filter, clean the blower assembly (see the Forced-Air Distribution Fix-It Guide), and make sure that all registers are open and not blocked.
If the furnace turns on and off repeatedly (cycles), clean or replace the filter; and clean the blower assembly (see Forced-Air Distribution Fix-It Guide).
If the furnace is noisy, make sure access panels are mounted and fastened securely; spray squeaking belts with fan-belt dressing and replace worn or damaged belts; adjust the blower belt; lubricate motor and blower oil ports.
If the element does not heat, refer to the Heating Element Fix-It Guide for guidance.

Oct 08, 2012 | Coleman Mobile Modular Home Electric...

1 Answer

The furnace will light up and the fan will blow but the flames cut out before my house reaches temp. i have the thermostat set at 70 and the house will not get above 55. i have tried turning the propane...


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

Dec 08, 2010 | Coleman Air Conditioners

1 Answer

Our Furnace doesnt seem to be working correct. We an: Air Pro BGM075128 and is Natural Gas. It will turn on when we turn up the thermostat.. but we never get any heat through the vents. There is a...


sounds like the blower motor is not working, if the furnace is actually lighting up and the burns are ignited. You should set your thermostat to auto, as if it is on fan then the fan runs all the time until you take it off of fan. I am a little confused and since I am not there I will give you a website that will walk you through the ignition process, this way we can eliminate flame sensor,ignitor, pressure switch,roll out switch, board,etc. I really hope this helps as I know what it is like to be in a cold house. Good Luck Tim

Nov 20, 2010 | Air Conditioners

1 Answer

Electric furnace runs but won't shut off on heat setting


I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.

Jan 20, 2009 | Goodman CLQ36AR49 Air Conditioner

2 Answers

Thermostat wont turn on heater Robert Shaw 9600 prog.


I have a thermostat 9600 Robertshaw and I have to use the trip switch to start my furnace. Then it reaches the temperature and sometimes it will kick in by itself but majority of the time I have to trip it. I have changed the batteries cleaned the thermostat,and reset it. Is it time for a new thermostat and can I replace it myself. Thanks

Nov 06, 2008 | Air Conditioners

Not finding what you are looking for?
Air Conditioners Logo

Related Topics:

82 people viewed this question

Ask a Question

Usually answered in minutes!

Top Air Conditioners Experts

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Bill Long

Level 3 Expert

577 Answers

Tim Whalen

Level 3 Expert

3056 Answers

Are you an Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...