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A blower motor is the component within a home’s HVAC system. The motor blows heated air through vents when the heating system is in use. Conversely, some blower motors blow cold air when the air conditioning system is in use. There are two main types of blower motors: single-speed motors and variable-speed motors.


The contactor is the part of the air conditioner that controls the flow of electricity into the unit. When you turn off your AC, the contactor goes up, blocking power. By the same token, every time you turn on the air conditioner, the contactor is lowered, allowing electricity to power the system. Once your home reaches the temperature set on the thermostat, the contactor goes up again.1. The condenser unit never shuts off
This could be a sign that the contactor has melted, leaving the air conditioner with no means to block electricity.
2. AC hums and won’t turn on
When you turn on the AC, you may hear the air conditioner humming, but it won’t fully power on.
3. AC makes a chattering noise
Another sign is a chattering sound coming from inside the air conditioning unit.
Is Your AC Contactor Failing?


Electric heaters are common in many split Hvac systems where it doesn’t get so cold, and also apart of many heat pump systems, which they are often referred to as ’emergency heat’. Electric heaters typically cost more to run than heat pumps, but are necessary when temperatures get so cold outside that the heat pump may not be able to keep up with the temperature.


Furnaces use a circuit or control board to perform any number of activities from simply igniting your furnace to alerting you to problems within your unit. This “brain” within the furnace initiates and ends the heating operation, monitors the temperature and watches your furnace for signs of problems.
Types of Control Boards
For a basic furnace, your control board will drive the operation of your ignitor, gas valve and flame sensor. These “simple ignition controls” are most common on older, less efficient units.
Integrated furnace controls, common on many high-efficiency furnaces today, lead the operation of many more activities. These might include the workings of the furnace blowers, as well as the onboard diagnostic system that provides you with troubleshooting information.
Control Board Operation
Typically, your control board kicks on the furnace ignition system (either a spark generator, glow coil or pilot light) after receiving a single from your thermostat that the temperature is too low. Once your ignitor is running hot, the control board gets gas flowing through the burners where that is ignited to start heating your home. Your control board then oversees the furnace’s operation until it receives another signal from your thermostat that your home has reached the appropriate temperature.


An HVAC sequencer is a small circuit designed to help stabilize circuits and turn switches on and off quickly in an electrical setting. The sequencers are designed to stage the different parts of the electrical equipment so that the appliance does not overload and break the circuits. Many products use the HVAC sequencers to keep engines and other mechanical devices from overheating or exploding.
An HVAC sequencer is identified by its unique size and shape. Depending on the size of the final product, the sequencers can be different sizes as well. There are usually two different segments to an HVAC sequencer, and they are attached together by a smaller middle piece. They are constructed of tough metal and are usually heavy. HVAC sequencer can be used in things such as electric pumps, furnaces, and motors.
Each type of HVAC sequencer has its own set of features. Some of the most common features, however, are shared among many different kinds of HVAC sequencers. Some common features are the ability to have a few seconds delay between sequences, several different mounting positions, the ability to resist shocks and vibrations, and 24-volt input control. HVAC sequencers are designed for several different kinds of tasks, which makes them have versatility in the features that they offer.