Remove panel to access fan and using a meter test fan or remove and bench test also check power supply to fan
What turns on the fan, a relay of its own, a defrost board, the compressor contractor? Check for power before and after the contacts. Read the lone or schematic diagram included with the unit if possible.
SOURCE: ptac fan keeps blowing
Try setting the fan control to "AUTO" this will cause it to cut out with the compressor.
SOURCE: Amana PTAC
Sounds like if this is a heat pump, maybe it tripped out on high pressure. Maybe just unplugging the system may reset the control boards. This maybe due to a dirty filter or dirty evaporator coil.
SOURCE: amana ptac shuts on and off constantly
your control board is shot and your ac can't tell the room is cold enough. 1-888-855-9987
SOURCE: Amana PTAC PTC093A35AA won't blow heat
The reset button is located behing a panel on the front of the unit that is labeled Heat Reset. If that label is gone then look around, it is a small hole, small enough for a paper clip to fit through.
That being said, I have 137 of these units in one of my hotels and have not had a single one needing to be reset. You probably are going to need a new control board kit. These can be purchased from Amana. They are $130. Make sure that you have pulled the heater coil out and inspected it first. Also, there was a recall years ago where Amana was supposed to contact and send out new voltage switches. These are the round black things that the Brown heater wires connect to on the upper and lower side of the heating coil. You should also try to replace those if you find the coil in good condition. I have had those resolve heating issues. Most of the heating issues were a result of a bad relay on the control board though.
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