I have a Goodman high-eff furnace, 115 BTU/hr. The fan runs constantly but it has stopped blowing warm air. I'm getting 6 flashing lights as error code. What's this mean?

https://diy.stackexchange.com/questions/130130/furnace-runs-for-about-5-minutes-only-and-shuts-off?rq=1
Why does my furnace run then stop? A common reason a furnace short cycles is because the heat exchanger, the part that heats your air, is getting too hot due to a lack of airflow. Once the heat exchanger overheats, it trips the high limit switch, which shuts the furnace down to protect it.Dec 9, 2016

Don't run it like this. Could be life threatening.

DuoTherm by Domestic-Fan runs, no cold air - iRV2 Forums

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Jan 22, 2012 - 12 posts - ‎4 authors Duo Therm by Dometic 13500 BTU air conditioning with ducting, furnace. I. ... If the fan runs but no cold air and the compressor feels like it is ...

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Jul 27, 2008 - 23 posts - ‎6 authors We have run it continuos like this before without any troubles. Thanks for the help! ....When you switch the AC unit on, the fan runs, but the compressor doesnt fire up. You used to be able ... You can find Dometic here. Logged. Dometic Duo Them Air Conditioner Cycles
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your limit switch is opening up, that causes constant fan. Check for flashing codes after flame shuts off and fan continues. Check airflow, filters, lack on return air for possible hi temp limit problems.

Furnace not big enough or poor insulation

Try the fan switch inthe ON setting rather than the AUTO setting, if it runs, power, both low(24) and high(115 or 230) are present. if not, check breakers and fused outlet if a split system furnace, read for 24 volts at red and common on low voltage terminal board where thermostat wires go on the furnace, if no 24 volts there and poers entering furnace, transformers bad.

Hello my name is Heath it will be my pleasure to assist you. The first thing to check is make sure the thermostat fan switch is set to auto instead of on. The next thing would be the High limit in the furnace or the rollout. If there is a sight glass on the bottom door of the furnace check to see if there is a flash code in the furnace then check it to the plate inside that has the flash code diagnosis chart.

On Goodman furnaces, 4 flashes usually means open high limit. Look for any burnt or loose wires or any resettable limits, they should have a red button that clicks when you push on it and wire going in and out of it with spade clips. If the open limit is not resettable, jump it out to verify its open and if that fixes the problem, replace the defective limit. Best of luck.

Depending on the age of the furnace you may be able to adjust the cool down. On some furnaces there is a silver box usually made by honeywell. This is your fan limit control. If you take the cover off you will see a dial with different temperature settings with 3 pins in a grove. The first one is fan on with temperature rise this turns the blower on when the furnace starts and warms up. The second is the fan off after furnace shuts down, this would be the one you want to adjust to a higher temperature to keep the blower from blowing cold air. The last pin is the high limit if the furnace gets to this temperature it will shut the furnace off but keep the blower running. Make sure that the thermostat fan option is set to auto and not on.

make sure high voltage wiring is correct