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Carrier Weathermaker 8000 - furnace does not ignite

My heating system will run perfectly for about 24 hours, then suddenly the furnace will no longer ignite and the system will just continue to blow cold air. The LED light flashes one long and 3 short flashes (I don't have the codes), and the only way to get it working again is a reset (shut off the power to the system). Any ideas? Thanks

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  • psingh2000 Jan 13, 2009

    I have the same since last two days

  • Anonymous Jan 22, 2009

    I have the same problem, changed the thermostat and cleaned the inside of the furnace (it was dusty in there) now I am going to change the heat sensor.

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Having a problem with a weather maker 8000. It will not come on at all unless I shut down the switch on the side of the furnace. filters is clean. it will start to light then stop

Posted on Dec 20, 2008

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Posted on Jan 02, 2017

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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.

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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.

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