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Furnace blows cold air, ignitor won't glow.

I have 2 red led flashestwice when I power up my trane xv90 furnace, then I get 3 red flashes & then 2 red flashes again & then the green led flashes slowly. The draft inducer motor comes on but the ignitor don't glow. After 3 attempts from the draft inducer, the blower fan comes on & just blows cold air into my ducts & out of the air vents. I set the thermostat from 68 to 72 but it still just blows cold air & the air is constant & don't stop until I turn off the furnace main power switch. The 2 red led flashes indicate a lockout, but how do I reset it to get it out of the lock out mode ? The 3 red led flashes say that the pressure switches may be faulty, but I checked them & they test o.k. & i cleaned out all of the ports where the tubes connect to the switches & draft motor. Please respond, Thank you. Jan Schwartz

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  • Anonymous May 02, 2009

    I have the same problem. Have you found a solution?

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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

Posted on Apr 16, 2009

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Error code= two red flashes, lockout/ no flame


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Furnance blows out cold air


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Heat pumps have a hard time getting any heat from outside, when it is bitter cold out-- could that be a clue?

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vulcan bonaire comfort control External natural gas electronic ignition 2004. ISSUE: Fan blowing only cool air continuously. Forced to kill power to stop it. model is one of the following. MB514E,20E or 30E. Going by mech drawing parts list. i can confirm what type of sensors i have cleaned with very fine sandpaper. flame sensor PN 5441603SP and IGNITER ELECTRODE PN 5441602SP The fault code i see is described as the following. There are x4 LED's. Sequence Left to Right. LEGEND: 1 Flame Sensor 2 Pressure switch 3 OverTemp 4 Diag. R Red G Green S Solid Colour B Blinking LED Behaviour. In order 2RS & 4GS Until i hear ignition. 2RS & 3RB Duration: split second 2RB,3RS & 4GB Duration: split second 3RS & 4GB Duration: Until it has completed blinking x4 times. 3RS Duration 4 seconds Repeat last two mentioned behaviour. in my own opinion, as a safety feature, the unit thinks that it has overheated or is about to. so kills the gas and force feeding cool air to heating components to save it from frying. Does this mean i have fault 04 if so does this mean i may have a faulty igniter or flame sensor or maybe a faulty as described in the mech drawing SWITCH OVER TEMPERATURE 120 degrees celsius. Am i correct here? Is this the over temperature cut out switch? if no one can really pinpoint which part requires replacement, can you at least, in sequence advise which parts to purchase? so then ill just try my luck. i wonder how to properly test if flame sensor, igniter, over temp etc is faulty with a multimeter. do i just perform a continuity test. I wonder what other parts can i test related to this fault im getting.

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