Amana ptac i have an amana heating and cooling unit in my room at school and i was messing with it to lower the temperature setting and now the LED just read 'on' in lower case letters. the ac or the heat will not turn on. is there anyway to reset it? how do i clear it so that my unit works again? thanks.

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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Hydronic switch open 9 E9 Hydronic switch open (if hydronic configured) - either the aquastat is defective, or the aquastat wiring is cut, or the aquastat is not present at all and the aquastat wires were not permanently connected together as per the set-up instructions.

diagnostic codes for ptac/pthp electronic control

https://www.google.com/search?q=Amana+PTAC+error+code+09

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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.

F1 - Control Board Failure - Replace control board (ERC). F2 - Oven Temperature Too Hot - Replace oven temperature sensor. F3 / F4 - Shorted or Open OvenTemperature Sensor - Replace oven temperature sensor. F5 / F6 / F8 - Control Board Failure - Replace control board.

The first 3 answers were from idiots. If a person had read her problem they would understand that it is not a oven / stove, but a PTAC unit that heats and cools a room. This type of unit is what is commonly seen in hotels and motels where the individual heating / cooling system is in each room.

I have seen this happen many times and if you cannot relocate the bulb of the thermostat to keep it form short cycling, I have mounted a wall thermostat and disconnected the thermostat in the PTAC and wired it in to the wall stat. You may have to install a wall stat in the center of the room away from the bar.

see if you can find a new board the power failure fried it

you may have a bad heat sequencer

Nope its a big room for 24000btu. the computation is 18sqm./ 1 ton. or 1.5 hp.