Amana PTC153A50AD Electric Heater

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.

Is this an electric unit or does it run on fuel?

check heater coil may be faulty may be a faulty thermostat or temp sensor

Yes. Heat pumps have to go into defrost just like a freezer when the temp gets too cold outside. The heat pump will temper the indoor air electric heat.

Is the blower running? Sounds like unit is tripping out on high limit safety switch.

when the coils freeze up , from intake of outside air, when using the heat pump mode, the unit will try to defrost the coils before going back to heat mode. mine did this alot. does it kick back to heat after a few mins? also after 2 years , mine started having issues with the exhaust blower control and would go into warp mode and bang noise.seems like common issues for this unit.whether the amana, or haier version.

HI,

Most likely has a freon leak , or a control problem causing heat to turn on, or if you have a heatpump the reversing valve has a problem.

1.check heatar of unit.
2.wireing of heater.
heater not workink.
thermostate also check

Check your thermostat and mode selector setting, thermostat setting should be set at warmer and mode selector setting should be at low heat or hight this is applicable for manual unit.
If it is a remote control just set the remote to heat mode.

sample only

FAULTS ARE STORED WITHIN THE CIRCUIT BOARDS MEMORIE TRY UNPLUGGING IT FOR 2 MINUTES AND PLUGGING IT BACK IN