Likely a bad relay
SOURCE: PTAC UNIT QUIT WORKING
If you have a clamp tester, operate the unit with the clamp tester and check the current reading. If the current reading is normal but the reset button is tipped then there is something wrong withe power plug reset button. But if the current reading is higher than the name plate rating then there is something wrong with the unit.
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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SOURCE: Amana PTAC cannot be turned on.
sound like a thermister problem, however this may also be a circuit board problem, the system is controled by the outdoor board, check to see if you have a blown inline fuse in the outdoor unit, it will be under a red case in one of the wires.
SOURCE: I have a amana ptac through the wall unit. the
several things could be the cause but lets start with the easiest first. check the filter to see if it is clean. if so then you need to see if the coils behind the filter are clean. a blockage of air flow will cause the unit to freeze up. If the coils look dirty then you can purchase a coil cleaner (aerosol) from a home improvement store or an a/c supply house and follow the directions on how to clean. These coils should look nice and shiny. If all of the above mentioned are in good shape then you possibly have a low charge of freon in the system. In that case an a/c tech will bee required since the usage of freon is only to be done by certified techs.
Hope this helped
Dave
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