One of the most important measures you can take as Peoria, AZ homeowner is to understand how to safely operate your furnace or heat pump. While there are the same basic types of safety devices on furnaces and heat pumps, there function differently for the different models. Knowing how these devices work on your specific model. Call Cool Touch if you have further questions.
Safety Features for Gas Furnaces
The main safety feature of gas furnaces is the limit switch, which shuts off the gas supply if it detects flames or heat outside the burner chamber. This device is typically located outside the chamber, and once it cuts off the gas, it will shut down the furnace until it is reset. Some furnace models feature controls that will display an error message or a manual reset button. If the limit switch has shut down the furnace, this button needs to be pushed before the furnace will turn back on; however, the reason for the limit switch locking out the furnace needs to be resolved or it will keep happening.
Heat Pump and Dual Fuel Safety Features
Heat pumps and dual fuel systems also feature a type of limit switch called the high-pressure limit switch. This device functions like the limit switch for gas furnaces, and it detects temperatures that are higher than normal in the airstream near the heat exchanger. It will shut down the backup gas furnace on dual fuel systems, but in the summer, the limit switch can accidentally get flipped under certain weather conditions, such as high air pressure.
More often than not, the limit switch on a heat pump shuts down the system because it got too hot due to improper airflow, which can be caused by a dirty or clogged air filter. If this happens often, these devices may eventually need to be replaced, and this is another reason it is important to change filters regularly. If you aren’t sure how to re-set your system, check the owner’s manual or call an HVAC technician.