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Is he outdoor unit running?
And when you say cold, do you mean cold like ac or just not warm?
OK. next tell me model on outdoor unit and what you have thermostat set to.
It is best to replace coil and outdoor unit as a matched pair. What is model on outdoor unit?
Should be a model on label on unit
Model will be something like NASB301CH or similar
OK this is what I expected.The outdoor unit is NOT a heat pump and therefore should not be running on call for HEAT . Turn thermostat to OFF and see if outdoor goes off.
Take your time. If outdoor stays running with thermostat off, we ay have a stuck contactor. If not but outdoor comes on when you call for heat, we may have an issue with thermostat setup.
OK next I need the model on your thermostat
Thermostat is probably set up incorrectly to work with the system.Sounds like it is setup for heat pump.
Tell me what wires go to what terminals
Lets look at configuration setup.
Then Select SETTINGs
Select gash heat for SYSTEM TYpe (It is probably set to heat pump)
I have to leave in a while to meet a power company rep on a job but will be back soon. Make sure the system selection is gas heat and not heat pump and probably this will solve your problem,If not we will go from here.