Originally Posted by 19buick61
I have a Nordyne furnace 904639k kg7sc 038d-23a. The furnace was installed about a month ago in the horizontal position. When the furnace starts, it will run for usually 5-10 mins then the flame goes out. When the flame goes out the inducer runs for another 2? minutes then the blower motor runs for another 2 minutes. As soon as the blower turns off, the inducer turns right back on and the cycle starts all over. Sometimes after the first cycle the flame goes out as soon as the blower comes out and sometimes it runs up to about 10 minutes. Their are no codes flashing on the LED lights. Any help will be greatly appreciated.
It sounds like every thing on the furnace is working right. You are saying that when the burner turns off, the stat is still calling for heat, so its not coming up to the set point? You need to check the W post to C post on the board when the unit stops and see if you still have 24 volts there. Another check is try turning the stat all the way up and see if it keeps going.
A lot of things can cause this problem your have.
Thermostat setting not set right.
Limit switch opening,
Problem with drain
Being that there are no codes i am wounding if the problem is in the stat.
What kind of stat do you have? ways it replaced with the furnace? does it have a heat amp. setting in the stat? Paul