How Do Identify A Bad Pressure Switch On a Furnace?

Though it is indispensable, you don’t really know much about your furnace. It consists of a complex system of components that work together to generate heat. Unless you are very familiar with HVAC systems, it can be hard to understand the functions these components perform or to judge if there is a problem. One of these components is the pressure switch.

What is a Pressure Switch and How Does it Function?

A pressure switch is a built-in, automatic safety feature located outside the furnace, near the motor. It controls the electrical energy going into the motor of the furnace. If the pressure switch is closed, electricity flows into the furnace, and if it is open, the furnace turns off.

With the help of sensors, a pressure switch can tell if there is a build-up of pressure inside the system and can help regulate it. If it senses negative motor pressure, it will turn off the motor. This helps prevent a backdraft of fumes into the ignition, which can be potentially lethal.

Types of Pressure Switches

Different types of furnaces have different functions and features. Most furnaces have a single-stage process to pump out heat. These furnaces have a single pressure switch.

In two-stage furnaces, there is an option that allows for different levels of heating, one level for standard heating and the other for additional warmth. This system is regulated by a pair of high-pressure furnace switches that allow the furnace to safely work at a higher pressure to provide the required level of heating.

Common Problems With a Pressure Switch

If your furnace doesn’t turn on, it may be because the pressure switch has found a problem and has turned the motor off as a safety precaution. The problem most likely must lie with the inducer or in the tube that connects the pressure switch to the inducer. In that case, you need expert for furnace repair in Marysville.

If a thorough examination shows that there is no problem with the above components, then the problem may be with the pressure switch itself.

  • The foremost problem is age. If the pressure switch of your furnace is old, its readings can be inaccurate, which will cause it to turn the motor off without reason.
  • With age, the switch will experience wear and tear. This long-term damage can be the reason why the switch is malfunctioning.
  • If the diaphragm of the switch hasn’t been cleaned properly, it can get coated in dirt and grime that can cause it to become stiff and unresponsive, affecting the function of the pressure switch.

It is possible to replace the pressure switch by yourself, but it is not advisable as there is a chance you can unwittingly damage the furnace or get injured yourself. In case the pressure switch is malfunctioning, it is best to contact a trustworthy professional for furnace maintenance near you.

At 1st Response Heating and Air Solutions, we have skilled and experienced technicians who can help you with repair, maintenance, and furnace installation in Lynwood and surrounding areasYou can depend on us to provide you with high-quality, reliable, and lasting services.

Contact us today to schedule an appointment for your furnace repair, to get any questions answered or to get a free estimate.