I have fored air furnace, i change the switch middle of the winter but after a month start blowing cold air now is time to take care becasue winter is going to be in couple of months, so please can you tell me what wrong.
Check your flu pipe and make sure there is no obstruction in the entire pipe. Sometimes the exhaust fan for the flu will not come on because the safety will not allow it to and it will also cause the fan to run, but not the burners to engage ignition.
Hope that helps.
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If it is a wall mounted one like the one in the picture and it is fairly new, and possibly a Fujitsu or LG, it may be by design. Modern AC can run backwards to become a heat pump and takes the cold air from outside, extracts warmth and blows it inside for the winter months. The remote has different symbols for heat or cool.
If not new, and only blows cold it needs refrigerant gas, or at worst a new compressor..
Turn power off & on again. Watch to see if it cycles...it could be the hot surface igniter if you don't see it turn bright orange. If it goes straight to blowing cold air, then normally it is a limit switch open- mostly manual reset - thermal disc-located around flame rollout.
look at the furnace and turn it on to see if the flames come on. Watch and see if they stay on for a period of time. If they come on then go out you may have a dirty flame sensor, if it goes out and then relights it may be a high limit switch getting weak. hope this helps.