Sanyo PTAC model STB0823H1 elec. heating element

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.

Contact Sanyo directly to request the information.

Features

• Cooling Capacity (BTU) : 6,000 BTU
• Maximum Cooling Amps : 5.6 Amps
• Maximum Cooling Watts : 618 Watts
• Heating Capacity (BTU) : 0 BTU
• Maximum Heating Amps : 0 Amps
• Energy Efficiency Rating : 9.7
• PTAC : No
• Window Type :Standard

Check unit's ID#'s and add any hyphens, etc or separate letters, numbers, to be exactly what's on unit.

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If you are saying this happens on a really cold night, the assumption is that on milder nights, it seems to work adequately.....If that's the case, there is a possibility that it is marginally sized in capacity to heat the space in which it is installed. If it has a "fresh air" damper setting, make sure that is closed completely, because that is air directly from outside the structure that is being brought in through the blower and adds more load to the space and makes the discharge air feel colder.

if the fan switch is in the Run position and not the auto position you are getting cool are when the heat element is not on. this is kind of like a way to circulate the air. look for an auto setting it then should only come on when needed. Keep in mind it is normal for the fan to start blowing before the heating element is warmed up, this prevents it from over heating, or coming on when the fan is not working

!. Check your fuse for the heating element, may be blown. 2. Check your heating sensor, may be open.. 3. Heating element defective.

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