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NO MAIN GAS

NEW FURNACE THE IGNITER LIGHTS BUT NO MAIN GAS

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I can help , If your positive there is 5psi + of gas going to the unit and you have tied the red low voltage wire with the white low voltage wire or R term. to W term. on the board or low volt. term board together and there is still no gas the problem is a bad gas valve , they are notorious for failing. Hope this helps you out , let me know if you have any more questions or problems. good luck Phil

Posted on Dec 31, 2008

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Posted on Jan 02, 2017

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Intertherm gas furnace in mobile home..igniter comes on then nothing tries to fire byrners but nothing


by igniter I assume you mean the thermocoupler. are you turning the control button to run after you light the pilot light? Normally when those furnaces quit it is the thermocoupler that has quit. Get a new one and leave it in the furnace compartment as a spare.

Jan 06, 2015 | Intertherm Heating & Cooling

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The furnace i have is blinking 3 times with a pause. i have checked the vent pressure switch with an ohm meter. reading is 0. blew into the hose and could hear the click of the limit switch also watch the...


Check your furnace door. Sometimes there is a legend to how many blinking lights means what. I had an issue with mine, read the code and it turns out it was hitting the high heat limit. Turns out my blower motor wasn't turning on. Replaced it with a spare and it was fixed. Find out what type of furnace, and google the name, model, and the words, 3 blinking lights. Does your furnace turn on at all? Does it start to go through the cycle then stop? This is the proper cycle of a furnace and what should happen.

Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

Mar 02, 2011 | Heating & Cooling

1 Answer

I have a bryant 90 i and when it calls for heat the inducer doesnt even come on


The first thing I would do is to verify that you have power to furnace. Check breakers and there may be a swith with a fuse in it mounted to side of your furnace or close by check fuse. You can use volt meter or test light to check for power. After you're sure you have power and thermostat is calling for heat if draft motor does not start you need to replace it. Draft motor is the first step in furnace start up.It should run for 30-45 seconds.then spark igniter or hot surface igniter should light pilot. It should stay on for about 20 seconds then burner should light. After burner lights the main blower should come on in about 2 mins. If you can get draft motor to run then procede to next step. Hope this helps you. Thanks

Nov 17, 2010 | Heating & Cooling

1 Answer

My goodman furnace keeps lighting for about 10 seconds than goes out lots of clicking sounds


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad igniter what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat.
2. Draft inducer motor starts.
3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes.
4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas.
Solution: You probably need to purchase and install a new igniter. I would suggest that you inspect your igniter closely for cracks. Make sure you do not touch the igniter with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, roll-out switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

NATE, NCCER, PHCC,HVAC Certified Instructor

Oct 25, 2010 | Heating & Cooling

2 Answers

I have a Carrier Weathermaker 8000 furnace. it will not light.I tested the igniter on my upstairs furnace and it will glow and light that furnace. I can manualy light the furnace with a match. flame sensor...


If you're sure the igniter is good and the controller is sending voltage to gas valve to open, but not to the igniter then, yes, the controller is bad. The only way to know for sure is to remove the igniter's molded plug from the board and test voltage directly at the board. You should get about 100-120 vac to the igniter.

Mar 25, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

3 Answers

Ruud Silhouette II Gas Furnace, the furnace lights but will only stay on for a few seconds?? What could be the problem??


Bad or dirty flame rod.
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Jan 09, 2010 | Ruud Heating & Cooling

1 Answer

I have a EVCON furnace DGAT070BDC. I replace the igniter control, the gas valve and the thermostat. Same problem continues: glow stick works, then the pilot lights works.The igniter control clicks...


You may have a dirty/rusty burner that is clogged or your gas valve
manifold pressure setting may be too low. Normal manifold pressure
is 3.5 inches water column on natural gas furnaces. ( 1 psig is equivalent to 28 inches water column). Pull and clean burner. Also
check and clean pilot assy. including flame sensor (if present).
Please let me know.

Oct 24, 2009 | Coleman Heating & Cooling

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...


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

Oct 17, 2008 | Heating & Cooling

1 Answer

Problem with heat pump


This sounds like a 4--step furnace. Step 1 ,the small ven fan turns on and proves it turnning thru the small air tube that sucks a switch close . Step 2 the spark igniter lights the pilot ...Step 3, the main gas valve opens up and dump gas in the venture tubes to heat the box up, Step 4 theres a swith in the box the when heated closes and turn the fan on! Thank-you-very-much!

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