I did disconnect the blend air system and have had no more problems so far so maybe that was the problem. Thanks DaleM and GOD BLESS.

Can you tell me which wires I need to disconnect?

Yes it has the blend air system and it does have A/C. I checked to be sure the blend air was working after I got the heat working again and it was working.

I have a Coleman DGAT075BDD that blowed the 3 amp fuse a few weeks ago so I replaced it and has worked fine until last night. I woke up cold and found the fuse blown again so I replaced it and repowered the unit and the fan ran and wouldn't go off and it had a code 4. I checked everything I thought ...

I have a Coleman DGAT075BDD furnace that blowed the 3 amp fuse a few weeks ago so I replaced it and has worked fine until last night. I woke up cold and found the fuse blown again so I replaced it but the fan came on and would not go off and it was flashing a code 4. I started checking everything I ...