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Furnace completes cycle but the (24volts)wont keep the gas valve on.

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Depending on which model you have there is a fan limit switch or a fan control or pc board that will bring the fan on once the furnace warms up some so that it doesn't blow cool air. This could be malfunctioning or the blower it;s self is malfunctioning which could be a fan relay, compasitor, or the blower motor it's self.

Posted on Sep 29, 2008


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Posted on Jan 02, 2017


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York Diamond 90 furnace blows cold air

There maybe a few issues. They have multiple safeties on furnaces. With this in mind this process to find the problem would take a Technician to check these safeties. It could be a flame sensor or thermocoupler each senses a flame or heat to keep the gas going. Also the damper for the flue must open for the gas to stay on. There may be more safeties on this and each safety sends a 24 volt current back to control module in order for the gas valve to stay open. If these aren't being met it will try around three times and go into a lock out mode which will keep gas shut off entirely.

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If you can see the ignitor coming on and the furnace will not fire, if you have a elect. meter, see if you have 24volts at the terminals on the gas valve right after the pilot lights or glow plug whichever. you should hear the gas valve click when pilot is on and have 24volts at the valve at that time. If you do, then the valve is bad.If you don't have 24 volts, then check the stat for 24 volts. A safety may have tripped also. Try these things first and let me know. Good Luck, Shastalaker7

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