I have a builder installed Goodman GDS80904BHA that is approximately 5 years old. Recently, when the furnace completes a heat cycle, approximately 1-2 minutes after the cycle has completed and after the blower shuts down, the blower will come on again for anywhere from 30-90 seconds. There is no call for heat during this "second" cycle. The blower just seems to be recirculating air. The furnace has never behaved in this manner before. The furnace was professionally inspected and cleaned less than 12 months ago and I have replaced all return air filters. I'd like to correct the problem before something breaks when it is really cold.

Well, unfortunately, what I thought was a solution turned out to be a mirage.

Here's what's happening now:

1. Call for heat.
2. Draft inducer starts.
3. Ignition glow plug starts.
4. Gas valve opens.
5. Blower motor starts.

Now... after about 2-3 minutes, the blower motor mysteriously stops. However, the flame does not shut off for another 1-2 minutes then cuts out (presumably because the temp inside the furnace has reached the upper limit).

The furnace then attempts to "recycle." Everything shuts down and it will start up again as if nothing happened. During the entire process, there are no error codes that flash on the LED located on the main board. The furnace will just keep cycling like this over and over.

I think that the problem has something to do with the limit switches, but I am not sure which one (there are several). Strange though that no error would be indicated on the circuit board if this were the case. The wiring diagram on the inside door of the furnace illustrates several LED flash codes pertaining to errors of the limit switches but in my case noting.


Any ideas? Well, unfortunately, what I thought was a solution turned out to be a mirage. Here's what's happening now: 1. Call for heat. 2. Draft inducer starts. 3. Ignition glow plug starts. 4. Gas valve opens. 5. Blower motor starts. Now... after about 2-3 minutes, the blower motor mysteriously stops. However, the flame does not shut off for another 1-2 minutes then cuts out (presumably because the temp inside the furnace has reached the upper limit). The furnace then attempts to "recycle." Everything shuts down and it will start up again as if nothing happened. During the entire process, there are no error codes that flash on the LED located on the main board. The furnace will just keep cycling like this over and over. I think that the problem has something to do with the limit switches, but I am not sure which one (there are several). Strange though that no error would be indicated on the circuit board if this were the case. The wiring diagram on the inside door of the furnace illustrates several LED flash codes pertaining to errors of the limit switches but in my case noting. Any ideas?

Wow. That would be the second control board in less than 12 months. When the control board went bad last time, it would start the inducer, light the glow plug but it wold not open the gas value. We replaced the board and all was fine. That was last March.

I think this furnace is cursed. Wow. That would be the second control board in less than 12 months. When the control board went bad last time, it would start the inducer, light the glow plug but it wold not open the gas value. We replaced the board and all was fine. That was last March. I think this furnace is cursed.