Manual reset ptac unit - Amana PTH123B25AJ Heat Pump Air Conditioner

Question edited for a lot more clarity.

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Probably this one. Talk to your installer.

https://www.amana-ptac.com/products/ptac/hec154j

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It sounds like your PTAC (packaged terminal air conditioner) unit is malfunctioning. When the thermostat is set to heating mode, the PTAC should be blowing warm air, not cold air. There are a few possible causes for this issue:

1. The PTAC may be low on refrigerant. If the unit is low on refrigerant, it may not be able to properly heat the air.
2. The PTAC's reversing valve may be stuck in the cooling position. The reversing valve is responsible for switching the flow of refrigerant between heating and cooling mode. If it is stuck in the cooling position, the PTAC will blow cold air even when the thermostat is set to heating mode.
3. The PTAC's heating element may be malfunctioning. If the heating element is not functioning properly, the PTAC will not be able to heat the air.

I recommend contacting a trained HVAC technician to diagnose and fix the issue with your PTAC. They will be able to determine the cause of the problem and repair it properly.

Try this:
http://www.amana-ptac.com/Portals/3/PTAC/PDF/IO-PTAC2.pdf

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Low Cost PTAC Curtain Air Deflector From RoomAire Works On All PTAC...

I found a few on line. You can propbaly find more choices. Do a web search for "Friedrich 42" PTAC air deflectors".

I don't see this error code in the manual. I do see nP as an error code for Window Switch lockout. I just had this happen to me and they had me reset the control board.

Remove case, flick master switch to OFF for 10 seconds. Press Heat/Cool same time turn switch back on HOLD until off light comes on.

You should be fixed. Just had to do this for my unit. I was playing around with the settings and turned on the window switch option by accident.

Check for a reset or circuit breaker on the unit.

HI, Take a look on amazon, here: Amazon com sanyo hvac parts. Wish you best of luck. Robert

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.
Please remember to rate this fix.

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.

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.