- Thermostat Not Properly Set: Make sure the thermostat is set to "Heat" mode and the desired temperature is set higher than the current room temperature.
- Clogged Air Filter: A dirty or clogged air filter can reduce airflow and block warm air from circulating properly. Check and clean or replace the air filter as needed.
- Low Refrigerant: If the heater uses a refrigerant, it might not be blowing warm air if the refrigerant level is low. You might notice ice or frost on the evaporator or refrigerant lines.
- Malfunctioning Fan: The fan motor or blower that circulates the warm air might be malfunctioning or not receiving power.
- Defective Thermostat: The thermostat might be malfunctioning and needs to be replaced.
- Blocked or Closed Vents: Make sure the vents and return air registers are open and not blocked by furniture or other objects.
If you have checked these common issues and the heater still isn't blowing warm air, it's best to consult an HVAC technician to diagnose and fix the problem.
