Why Is The Heater Not Blowing Hot Air In My House

broken heater

There are several reasons why your heater might not be working properly. Poor maintenance, such as a dirty blower or air filters, can cause equipment failure. The thermostat may be malfunctioning or improperly set. The blower capacitor may be dead, and the refrigerant levels may be too low in a heat pump. 

Additionally, faulty ductwork installation or design can restrict airflow and cause the heater to not work properly. It is recommended to call a seasoned HVAC technician to diagnose and fix any problems with your heater.

Failed to Perform Routine Maintenance of Your Heater System

poor maintenance is one potential reason why your heater might not be working properly. If your furnace has not been regularly tuned and maintained, it can become dirty, which can cause equipment failure. Dirty air filters can restrict airflow and worsen issues with wrong duct sizing. 

A dirty flame sensor can prevent the burners from lighting. Dirty burners can also cause the furnace to not work properly. To avoid these issues, it is recommended to have your furnace tuned by a professional HVAC technician on a yearly basis. Regular maintenance can prevent costly repairs and ensure that your furnace continues to work properly.

Dirty Air Filter

A dirty air filter can impede airflow and cause the heating system to overheat. When the heat exchanger gets too hot, the safety sensors will prevent it from cycling. For a heat pump, the system will turn off if the coils get too hot. In an electric furnace, the system may also automatically power off. 

To replace the air filter, you will need to turn off the power to the heating system and locate the air filter housing. You may need a screwdriver to open the housing door. Slide the old filter out and dispose of it if it is more than three months old or if it is covered in dust and debris. 

Insert a new, clean filter into the chamber, making sure it is oriented correctly. Close the housing door and restart the heating system. This should help to improve airflow and prevent overheating.

It could be your Power Source

Checking the power source is an important step to take if your heater is not working properly. It is possible that the power switch on your unit is not in the “on” position, or that the power source is not being delivered properly to the unit. For electric units, you should check the circuit breaker to ensure that electricity is being sent to the unit. 

For gas units, you should check the pilot light and ensure that there is enough fuel delivered to the unit. It is also important to check the gas control valve to ensure that it is in the “on” position. If you are unsure how to check the power source or are unable to diagnose the problem, it is recommended to call a professional HVAC technician for assistance.

Malfunctioning Thermostat

A malfunctioning or improperly set thermostat can also cause your heater to not work properly. The thermostat is responsible for regulating the amount of heat generated by your furnace and when that heat is generated. If the thermostat is not functioning correctly, it may not provide the appropriate signals to your furnace to turn on and generate heat. 

In some cases, the problem may be due to incorrect programming or reprogramming of the thermostat. If you suspect that your thermostat is the problem, it is recommended to call a professional HVAC technician to diagnose and fix the issue.

The Blower Capacitor Is Dead

A dead blower capacitor can also cause your heater to not work properly. The blower capacitor is a part of the furnace that looks like a large battery. It is responsible for starting the furnace when the thermostat sends a signal to do so. Over time, the capacitor may lose its ability to hold a charge, which can prevent it from starting the blower. 

In this case, the simple solution is to replace the capacitor. You can find out this simply by listening to any buzzing in your furnace. If your heat pump or gas furnace is making a buzzing sound, it may indicate that the capacitor in the blower is failing.

It is recommended to have a professional HVAC technician handle this repair, as working with capacitors can be dangerous if you are not trained and equipped to do so.

The Low Refrigerant Levels in a Heat Pump

Another common reason is low refrigerant levels in a heat pump can cause the heater to not work properly. If the refrigerant levels are too low, the heat strips may come on too frequently, which can lead to high utility bills and potentially cause the compressor to overheat and break down. 

It is important to monitor the refrigerant levels in your heat pump and recharge or fix leaks as needed to prevent these problems. It is recommended to have a professional HVAC technician handle refrigerant recharge or leak repair, as working with refrigerant can be dangerous if you are not trained and equipped to do so.

The overload Motor Needs to be Reset

If the motor of your heating unit has overheated (often due to dirt and debris), your entire system will shut down. Try turning off the system and giving it a half-hour of rest so that it can cool. After that time, try turning the heater on a second time. 

If the motor does not begin working, you can try the process a second time. If the third time is not the charm then you should contact a professional for a proper diagnosis.

For furnace systems, inspect the blower compartment for potential issues with the blower motor, control board, and run capacitor. There should be a flashing green light in the blower compartment’s inspection window indicating that everything is running smoothly. 

If the light is either red or not flashing at all, then further inspection of those areas is required.

Inspect for Any Circuit Breaker Issue

Inspecting your circuit breaker is another important step to take if your heater is not working properly. If the circuit breaker for your heating unit has tripped or is otherwise not functioning properly, it can prevent your heater from turning on. 

To inspect your circuit breaker, you will need to locate the main electrical panel for your home and look for the circuit breaker that is labeled for your heating unit. If the circuit breaker has tripped, it will be in the “off” position or will be between the “on” and “off” positions. In this case, you can move the circuit breaker back to the “on” position to reset it. 

If the circuit breaker continues to trip, or if you are unsure how to inspect it, it is recommended to call a professional electrician for assistance.

Faulty or Dirty Pilot Light

If you have a furnace and the pilot light is out, the furnace will not be able to turn on. A faulty or dirty pilot light or sensor can cause this problem. If you are not comfortable trying to relight the pilot light yourself, it is recommended to call a professional HVAC technician for assistance. 

Most HVAC companies offer 24/7 on-call services for heating system emergencies. The technician will be able to diagnose and fix the problem with your pilot light to ensure that your furnace can turn on and heat your home properly.

Check the Flame Sensor

Checking the flame sensor is another important step to take if your heater is not working properly. A dirty flame sensor can prevent the furnace from turning on, as it is a safety feature designed to stop the combustion process in case of debris in the chamber. 

Ash, dust, or dirt can cover the flame sensor and block it, preventing the furnace from turning on. This problem can be easily fixed by cleaning the flame sensor. Regular maintenance, including annual furnace tune-ups, can also prevent this problem from occurring. 

It is recommended to have a professional HVAC technician clean and inspect the flame sensor to ensure that it is functioning properly.

Faulty Ductwork Installation

If faulty ductwork installation is the cause of your heater not working properly, it can restrict airflow and prevent your furnace from heating your home effectively. In some cases, the issue may be due to corners being cut during installation in order to save time and money. 

It is important to ensure that your ductwork is properly designed and installed to avoid these problems. It is recommended to have a professional HVAC technician inspect and repair any faulty ductwork to ensure that your furnace can heat your home effectively.

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