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Turn on furnace immediately 3 flashes start. fan goes on, blower blows, ignition doesn't light. blower stays on blowing cool air

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  • junkme Oct 20, 2008

    Furnace has power, blower starts but no ignitor or flame...

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  • 30 Answers

There are rollout switches in the unit. check them to seeif they are tripped

Posted on Oct 30, 2008

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Tractorman44 thanks but misunderdstood husband! When thermostat turned up the fan comes on before flames ignites. Plenum heats and furnace runs.


If the fan comes on first, then the flame ignites, it USUALLY indicates there is a problem in the ignition process of the furnace. Most new manufacturers have the adjustable 'time off' sequence for the blower, and most initiate a call for the blower to run within a pre-determined amount of time AFTER a call for heat has been established. ALSO, and this is where I think the problem is, the ignition sequence starts immediately upon a call for heat. If there is a heat ignition failure, it will attempt a restart. USUALLY, they allow 5 restarts within a certain timeframe then the circuit board locks out the heat sequence until it is reset by cycling the power or cycling the thermostat manually.

What I think is happening with yours it that your ignition sequence is experiencing a 'flame failure' upon a call for heat....then it re-establishes the ignition sequence, which takes another 30 to 45 seconds. During this time, the blower automatically starts (because the allotted time has expired) and blows COLD air because of the initial flame failure. In the meantime the ignition sequence establishes a flame on the second or possibly the third try and then you feel the warm air.

IF this is the case, ultimately what will happen is that the furnace will continue to experience 'flame failure' and eventually fail to the point of 'flame failure lockout' and you will have no heat, but the fan could possibly run continuously.

At any rate, without being able to be there to troubleshoot and test components physically, this is just a calculated and reasonably reasonable guess. What it is telling you is that you probably need to contact a reputable, reliable service organization to give your furnace a good going over before it lets you down on a good cooooold night!!!

I hope this helps you understand the basics of what happens within the system and bear in mind, this is a 'generic' sequence and possibly NOT the exact sequence of your particular furnace.

Oct 01, 2015 | Air Conditioners

2 Answers

Amana model gmh95070


Don't need the blue wire is common for the ac condsor unit what t-stat is it honeywell 4000 6000 8000 or one of rth models there is many t-stats as far as you saying fan stayes on check the auto / on section of the t-stst main wirers are RH/R-power W-heating Y-coolin G-fan

Mar 14, 2014 | Goodman Air Conditioners

1 Answer

Furnace fan will not turn on when in "Auto" mode. If switch to "Manual" mode on thernostat, fan will come on, but doesn't blow warm air.


depending on which make aand model of furnace the heating blower relay or heating blower switching device could be bad when you switch the t-stat to manual or on that energizes the cooling blower relay is it gas or electric?

Dec 28, 2010 | Air Conditioners

1 Answer

Weather King blows fuse in Criterion II furnace


You probably have a shorted wire between the heater and the a/c. There are two wires that conncet the control power to the outdoor a/c from the heater they should be on terminal c & y in the heater. disconect those two wires and try it again if the fuse doesnt blow you have a short in the wire between the a/c & heater

Jun 01, 2009 | Weather King 10AJA2501AH Air Conditioner

1 Answer

Furnace blows cold air, ignitor won't glow.


ok this is going to sound funny but it seems as though the polarity is reversed going into your furnance. to correct this proiblem you first need to unplug the unit and where the cord goes into the furnance at that connection disconnect the two wires. Once theses are disconnected switch the wires .All you are doing is reversing the way the electricity flows into the circut board. I would wager that is the problem

Apr 13, 2009 | Air Conditioners

1 Answer

Furnace wont run


First of all when you flip the switch, it goes thru a startup sequence. THEN it turns on the Igniter (notice the red glow). Then the gas turns on.

Now at this point check the idiot light and it should be giving you a code of 34. That 34 (3 shorts 4 longs) says that there was a problem igniting the furnace. After it cycles thru at least 4 times and fails to ignite all the blowers, then is when you get a code 14 (1 short 3 longs)

NOTICE what's happening with ALL the burner Tubes each time it attempts to ignite. If only one or two are running....then this is your problem.
To fix all you do is take out the burner Tubes, look for debris, blow them out (blow from the front where all the jets are), and replace them in sequence from left to right (the tabs overlap).


Jan 23, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Ruud Silhouette II Fails to Ignite


sounds like you have bad flame sensor or the sensor is in a bad postition. To get eliminate the lockout turn the power off to the unit and back on again. Look at the circuit board light and see what the troubleshooting code is.

Jan 13, 2009 | Air Conditioners

1 Answer

(HVAC) Furnace Not Igniting Quickly


Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

Jan 08, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Furnace sometimes will not stay lit


Check the heat exchanger for a crack or hole. The room air blower is blowing back into the heat exchanger extinguishing the flame. Have it checked out today. Did you get it checked yet? Now. Have I stressed to you to get it checked out yet or have you been overcome by Carbon Monoxide yet?

Dec 10, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

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