A common issue encountered in residential heating systems is the absence of forced air circulation. This malfunction, characterized by a functional heating unit that fails to distribute warm air throughout the living space, can stem from a variety of underlying causes. An example includes a furnace firing correctly but no air emanating from the vents.
Addressing this problem is critical for maintaining comfortable indoor temperatures, preventing potential damage to the heating system, and ensuring efficient energy consumption. Historically, ineffective air circulation has led to increased energy bills, uneven heating, and, in some cases, the premature failure of heating components due to overheating.
Understanding the potential causes and troubleshooting steps is essential for homeowners and HVAC technicians alike. The following sections will explore common reasons for this issue, diagnostic procedures, and potential solutions to restore proper airflow within a home heating system.
1. Blocked Air Filter
The story of a malfunctioning heater often begins with a seemingly insignificant component: the air filter. This unassuming barrier, typically made of fiberglass or pleated material, serves as the system’s first line of defense against dust, pollen, and other airborne particles. Over time, these filters become laden with debris, gradually impeding airflow. The consequence is a diminished ability of the blower fan to draw air across the heating element and circulate it through the ductwork. Imagine a runner attempting to sprint while breathing through a constricted straw; the effort becomes exponentially more difficult. Similarly, a heating system laboring against a blocked filter struggles to move air, resulting in minimal output at the vents. The impact on the “house heater not blowing air” is direct and profound.
Consider the scenario of a family experiencing increasingly cold rooms despite a functioning thermostat. A technician, after ruling out more complex issues, discovers a completely clogged air filter a thick mat of dust accumulated over months of neglect. Replacing the filter immediately restores proper airflow, demonstrating the critical role this component plays. This underscores the filter’s necessity to keep the system working efficiently, reducing stress on other components, and significantly improving indoor air quality. Regular filter replacement is not merely preventative maintenance; it is a fundamental requirement for optimal system performance.
The connection between a blocked air filter and the phenomenon of “house heater not blowing air” illustrates a fundamental principle of HVAC operation. Even a system with a robust heating element and a powerful blower fan cannot overcome the resistance imposed by a significantly clogged filter. Addressing this often-overlooked component is a simple, cost-effective solution that can prevent more serious mechanical failures and ensure consistent, comfortable heating throughout the home. The blocked filter serves as a potent reminder that routine maintenance is essential for prolonged system health and efficacy.
2. Blower Motor Failure
The absence of warm air emanating from vents, an indication that the “house heater not blowing air”, often leads to an investigation of the blower motor. This component, the engine of air circulation within the heating system, is responsible for pushing heated air throughout the ductwork. When the blower motor falters, the entire distribution network grinds to a halt. Its failure represents a critical breakdown, directly impacting the system’s ability to deliver warmth.
-
Winding Burnout
The motor’s core lies in its windings coils of wire that generate the magnetic field necessary for rotation. Over time, these windings can succumb to overheating, insulation degradation, and, ultimately, burnout. Imagine a wire carrying too much current for too long; it eventually melts. Similarly, a blower motor subjected to excessive strain, perhaps due to a blocked filter, overheats, leading to short circuits and complete motor failure. A homeowner might report a burning smell preceding the complete cessation of airflow, a telltale sign of winding failure.
-
Bearing Seizure
The blower motor’s shaft spins on bearings, designed to minimize friction and ensure smooth rotation. Lack of lubrication, dust ingress, or simple wear and tear can cause these bearings to seize, locking the motor in place. A homeowner may hear a high-pitched squeal or grinding noise gradually worsening over time, followed by the complete absence of blower function. This is akin to a rusty hinge resisting movement; the motor struggles until it can no longer overcome the friction.
-
Capacitor Defect
The capacitor provides the initial jolt of energy required to start the blower motor. A failing capacitor can prevent the motor from starting, resulting in silence where there should be a hum of activity. One might compare it to a car battery that lacks the power to crank the engine; the starter motor merely clicks, unable to initiate the combustion process. A technician might use a multimeter to test the capacitor’s capacitance, revealing a significant drop below the specified value, confirming the diagnosis.
-
Electrical Connection Issues
Loose or corroded wiring can interrupt the power supply to the blower motor. Over time, vibrations and environmental factors can loosen connections or cause corrosion to develop, increasing resistance to electrical flow, ultimately resulting in complete electrical outage to the motor. One might compare it to a disconnected wire for a light bulb; no electricity flow so no light. A technician might look for burned or damaged wires near the motor.
These facets of blower motor failure paint a vivid picture of its central role in the “house heater not blowing air” scenario. The consequences range from the subtle a gradual decrease in airflow efficiency to the catastrophic a complete absence of warm air. Diagnosing and addressing blower motor issues requires a systematic approach, considering the interconnectedness of its internal components and the external factors that can contribute to its demise. Replacing the blower motor can restore heat through the home again.
3. Ductwork Obstructions
The tale of a home stubbornly resisting warmth often leads investigators to the labyrinthine network of ducts snaking through walls, ceilings, and crawl spaces. These conduits, the arteries of a heating system, are susceptible to blockages that choke off airflow. When ductwork becomes obstructed, the promise of warmth becomes a frustrated expectation, resulting in a definitive case of “house heater not blowing air”.
-
Collapsed Duct Sections
Imagine the aftermath of a heavy snow: A flexible duct, strained by age or inadequate support, succumbs to gravity’s persistent tug. It buckles, its circular form flattening into a constricted passage. The blower motor strains, but the air, like a river forced through a narrow gorge, encounters insurmountable resistance. Rooms at the duct’s terminus receive only a whisper of warmth, if any at all. The homeowner, oblivious to the hidden collapse, wonders why the thermostat setting bears no relation to the actual room temperature. This is a case of ductwork obstruction.
-
Debris Accumulation
Over years, dust, rodent nests, and detached insulation accumulate within the ductwork. This detritus, a silent accrual of refuse, gradually narrows the passage, impeding airflow. Consider an older home where construction debris was carelessly left behind during initial installation; over time, this material settles and consolidates, creating a dam-like effect. The blower fights against this resistance, working harder and less efficiently. Eventually, the accumulated debris causes substantial obstruction, and the system may eventually fail as the fan will work very hard.
-
Damper Malfunctions
Dampers, strategically placed within the ductwork, regulate airflow to different zones of the house. A malfunctioning damper, stuck in a partially or fully closed position, can severely restrict airflow to specific rooms or entire sections of the home. Picture a homeowner unknowingly fighting against a closed damper. The system may attempt to provide even heating, but instead airflow is redirected to other zones causing an imbalance. The issue could cause complete airflow stoppage, and create major imbalances in room temperatures. This situation results in uneven heating and reinforces the condition of “house heater not blowing air” in affected areas.
-
Improper Installation
Sometimes, the problem originates with the initial ductwork installation itself. Sharp bends, excessive length, or undersized ducts can inherently restrict airflow, even in the absence of other obstructions. A contractor, in an attempt to save costs, may install ducts that are too narrow for the intended airflow requirements. This “design flaw” creates a constant source of resistance, forcing the blower to work harder and ultimately limiting the system’s overall heating capacity. The consequence is predictable: insufficient heating, especially during peak demand, solidifying the problem, that house heater not blowing air.
These examples showcase how ductwork obstructions create a detrimental effect on a heating system’s ability to function properly. Addressing the obstruction by inspecting and cleaning the ductwork can restore airflow and allow the heater to function and resolve the issue of “house heater not blowing air” for occupants of the home.
4. Thermostat Malfunction
The inquiry into a “house heater not blowing air” often leads to the unassuming device on the wall: the thermostat. While seemingly a mere temperature gauge, it serves as the central nervous system of the heating apparatus. A fault within this control unit can disrupt the entire heating sequence, leaving rooms chilled and expectations unmet. The thermostat is more than just a switch; it is the director of the entire heating symphony, and when it’s off-key, the whole performance suffers.
-
Incorrect Temperature Readings
Imagine a thermostat perpetually misreporting the room temperature. Believing the house to be warmer than it actually is, it never signals the heater to initiate its cycle. A family huddles under blankets, unaware that the thermostat, due to a faulty sensor, is contentedly displaying a balmy 72 degrees when the actual temperature hovers near 60. The heater remains dormant, and the air remains still. This subtle deception can persist for days, leading to escalating discomfort and mounting frustration. The “house heater not blowing air” becomes a chilling reality, masked by a deceptive display.
-
Faulty Wiring and Connections
Within the thermostat’s casing lies a network of delicate wires and connections, vulnerable to corrosion, loosening, or outright breakage. Picture a scenario where a crucial wire, responsible for signaling the blower fan to activate, has detached from its terminal. The thermostat dutifully triggers the heating element, but the signal to circulate the warmth never arrives. The heater generates heat, but the blower remains silent, resulting in an uneven distribution of the heat if any at all. The system becomes a paradox: warmth generated, yet cold air persists due to the lack of air flow. The “house heater not blowing air” in certain rooms is a direct consequence of broken connectivity.
-
Relay Failure
The thermostat relies on relays, electromechanical switches that translate its temperature readings into commands for the heating system. A failing relay, its contacts pitted or corroded, may fail to properly switch, preventing the blower motor from engaging. Imagine the relay is a gatekeeper who has lost his keys and the warm air is trapped inside. The heater might ignite, but the relay, weakened by age or electrical surges, cannot complete the circuit to the blower motor. This is akin to a drawbridge failing to lower, preventing the traffic flow. The “house heater not blowing air” emanates an issue of component failure that must be addressed.
-
Incorrect Settings or Programming
Modern programmable thermostats offer intricate control over heating schedules, but complexity also introduces the potential for error. A user, inadvertently setting the thermostat to “hold” at a low temperature or creating conflicting program settings, can inadvertently prevent the heater from activating during occupied hours. The “house heater not blowing air” becomes an unintended consequence of misguided automation. Overriding any changes to settings or programming can resolve the issue.
In each of these instances, the thermostat, despite its outward appearance of functionality, contributes directly to the problem of “house heater not blowing air.” It is a silent saboteur, undermining the heating system’s ability to deliver warmth, often without any obvious indication of its malfunction. Investigating the thermostat is a vital step in resolving the lack of airflow and restoring comfortable temperatures throughout the home.
5. Limit Switch Tripped
The narrative of a cold home sometimes centers on a small, often overlooked component: the limit switch. This safety device, wired into the furnace’s control circuit, acts as a vigilant sentinel, guarding against overheating. When temperatures within the heat exchanger reach unsafe levels, the limit switch abruptly interrupts the heating cycle, preventing potential damage or even fire. This protective measure, while crucial for safety, can manifest as the unwelcome symptom of “house heater not blowing air.” The tripped limit switch, in effect, silences the blower, leaving the homeowner to grapple with a sudden and unexplained absence of warmth.
Consider a scenario where a homeowner, plagued by persistently clogged air filters, unwittingly pushes their furnace to its thermal limits. The restricted airflow forces the heat exchanger to work harder, driving temperatures skyward. The limit switch, sensing this dangerous escalation, trips, cutting power to the gas valve and, critically, the blower motor. The homeowner, discovering that the heater is no longer blowing air, may initially suspect a blower motor failure. However, a closer examination reveals the tripped limit switch, a silent testament to the underlying issue of restricted airflow. Resetting the switch might restore temporary operation, but unless the root cause the clogged air filter is addressed, the cycle of overheating and shutdown will inevitably repeat. This example underscores the limit switch’s vital role as a safeguard, preventing catastrophic damage at the cost of temporary discomfort. The homeowner is now forced to keep the heat turned off, until the problem is found and resolved.
In essence, a tripped limit switch is not the primary problem, but rather a symptom of a deeper issue. It serves as a crucial warning sign, indicating that the furnace is operating outside its safe parameters. Understanding the relationship between a tripped limit switch and the symptom of “house heater not blowing air” is paramount for effective troubleshooting. Ignoring this warning can lead to further component damage and potentially hazardous conditions. Addressing the underlying cause of the overheating be it a blocked filter, ductwork obstruction, or blower motor malfunction is essential to ensure the safe and reliable operation of the heating system. Once that is resolved, the limit switch is reset and the system restarts and the heat is restored to the home.
6. Capacitor Issues
The blower motor’s silent struggle often points towards the humble capacitor. This small, cylindrical component stores electrical energy, providing the surge needed to kickstart the motor. Its failure, often subtle at first, can lead to a complete cessation of airflow, culminating in the disheartening discovery of “house heater not blowing air.” Consider a scenario where the homeowner notices the furnace takes longer and longer to initiate. Initially, the delay is barely perceptible a few seconds of hesitation. But, over weeks, the lag grows more pronounced, accompanied by a faint humming sound emanating from the furnace cabinet. This humming is the blower motor attempting, unsuccessfully, to overcome inertia, starved of the energy it requires to begin rotation. The capacitor, weakened by age and constant use, can no longer deliver the necessary jolt. The blower motor strains, eventually giving up, leaving the house airless and cold. The importance of the capacitor becomes strikingly clear, as the heating system becomes non-functional.
Imagine the technician arriving, multimeter in hand. He tests the capacitor, its reading falling far below the specified capacitance. A replacement is installed, and with a smooth whir, the blower motor springs back to life, pushing warm air through the vents. The problem solved, the connection between a failing capacitor and the absence of airflow is revealed. The significance lies in the capacitor’s role as a starting mechanism. Without it, the blower motor, no matter how robust, remains dormant. This is not merely a matter of inconvenience; a struggling blower motor can draw excessive current, potentially damaging other components and shortening the system’s lifespan. Regular inspection and timely replacement of capacitors, therefore, become essential for maintaining the overall health and efficiency of the heating system. A faulty capacitor can also lead to complete system failure.
The story of the capacitor and the “house heater not blowing air” serves as a reminder that even small components can wield significant influence. Understanding the capacitor’s function and recognizing the early warning signs of its failure is crucial for preventing heating system breakdowns. The challenge lies in the fact that capacitor issues often manifest gradually, making them easy to overlook. Addressing the early signs of a failing capacitor, can restore the comfort of a warm house.
7. Ignition Problems
The enigma of a “house heater not blowing air” sometimes originates not in the ductwork or blower itself, but in the fiery heart of the furnace: the ignition system. This crucial component, responsible for initiating combustion, can indirectly cause a cessation of airflow if its operation is compromised. A failure in ignition, while primarily affecting heat generation, sets off a chain of events that can prevent the blower from ever engaging, leaving the house cold and still.
-
Failed Pilot Light
Picture an older furnace, its pilot light extinguished by a draft or a gas supply interruption. The thermocouple, sensing the absence of the pilot’s flame, shuts off the gas valve, preventing a potentially dangerous accumulation of unburned fuel. The furnace control board, designed to initiate the blower only after successful ignition, remains dormant. The homeowner, accustomed to the familiar rush of warm air, is met with an unsettling silence. The “house heater not blowing air” becomes a consequence of a simple, yet critical, flameout. Relighting the pilot becomes a task to restore heat to the home.
-
Faulty Flame Sensor
Consider a scenario where the ignition system sparks to life, igniting the gas. However, a faulty flame sensor, its surface coated with soot or its circuitry degraded, fails to detect the presence of the flame. The control board, misinterpreting the signal as an ignition failure, abruptly shuts down the gas valve and, consequently, prevents the blower from activating. The “house heater not blowing air” stems from a miscommunication between the flame and the control system. Cleaning or replacing the flame sensor is the key for a successful heating system.
-
Ignitor Malfunction
Imagine a modern furnace equipped with an electronic ignitor, a small but crucial element that generates the spark needed to ignite the gas. Over time, the ignitor can weaken or crack, failing to produce a sufficiently strong spark. The gas valve opens, but the fuel fails to ignite, resulting in an aborted heating cycle. The control board, detecting the lack of flame, prevents the blower from starting, adhering to its safety protocols. The “house heater not blowing air” becomes an indirect result of an electrical failure. The homeowner should have it professionally inspected.
-
Control Board Issues
The furnace control board orchestrates the entire heating sequence, including ignition and blower operation. A malfunction within the control board itself can disrupt the ignition process, preventing the blower from engaging. Picture a scenario where the board, due to a software glitch or component failure, sends an erroneous signal, prematurely cutting off the gas supply. The blower, programmed to activate only after successful ignition, remains idle. The “house heater not blowing air” becomes a symptom of a larger, more complex electronic problem. This needs to be addressed by a qualified professional.
The connection between ignition problems and the phenomenon of “house heater not blowing air” may seem indirect, but it highlights the intricate interplay of components within a heating system. The safety mechanism is designed to shut down the system when something goes wrong. Addressing the ignition issue is only one step, the technician will make sure the other components of the system are still in good working order.
8. Electrical Connections
The persistent chill within a home can sometimes be traced to a seemingly innocuous source: compromised electrical connections within the heating system. The narrative of “house heater not blowing air” often involves a disruption of power flow, silently halting the machinery designed to circulate warmth. A loose wire, a corroded terminal, or a failing relay can sever the electrical pathway, preventing the blower motor from receiving the energy required to propel heated air through the ductwork. The system may appear functional, yet the absence of airflow betrays the underlying electrical fault. Picture a homeowner grappling with escalating energy bills despite a seemingly responsive thermostat. The technician, after systematically eliminating other possibilities, discovers a corroded connection at the blower motor’s power supply. The diminished voltage, insufficient to start the motor, had been the culprit all along. Cleaning and tightening the connection restores proper voltage and airflow, revealing the critical role of reliable electrical pathways.
Consider the case of a newly installed furnace exhibiting intermittent airflow issues. The homeowner, frustrated by the unreliable heating, calls the installation company, where the technician discovers that the wire was not tightly secured by the person who installed it. The installer had failed to properly tighten the connections during installation, creating a high-resistance junction. This loose connection, undetectable to the naked eye, generated heat, further accelerating corrosion and eventually leading to intermittent power loss. The “house heater not blowing air” became a direct consequence of substandard installation practices. Correcting the connection ensures consistent power flow, restoring the furnace’s intended performance. A faulty electrical connection in the wire can result in a surge which would damage the unit, including the thermostat which may need to be replaced.
The electrical network within a heating system represents a critical, yet often overlooked, component in the pursuit of consistent warmth. While mechanical failures frequently dominate diagnostic efforts, the integrity of electrical connections should not be underestimated. Recognizing the potential for such failures and implementing diligent inspection and maintenance practices can prevent the frustrating scenario of “house heater not blowing air.” Furthermore, this understanding underscores the importance of qualified technicians who understand the electrical components and interworking within the system.
Frequently Asked Questions
The following section addresses common inquiries regarding heating systems that fail to circulate air. Each question delves into a specific concern arising from this malfunction, offering insights gleaned from experience.
Question 1: If the furnace ignites and produces heat, but air fails to exit the vents, is the heater itself broken?
Not necessarily. The issue of “house heater not blowing air” often masks a problem distinct from the heating element. The blower motor, responsible for circulating the heated air, may be the true culprit. Imagine a skilled blacksmith forging a sword, but unable to deliver it to the battlefield. The sword’s creation is flawless, yet its purpose remains unfulfilled. Similarly, a functional heating element rendered useless by a failed blower necessitates a separate investigation.
Question 2: Is it safe to continuously reset a tripped limit switch to restore airflow temporarily?
While tempting, repeatedly resetting a tripped limit switch invites potential danger. This safety device activates to prevent overheating, a condition that can lead to fire or component damage. Ignoring this warning is akin to disabling a smoke detector to silence its alarm. The underlying cause of the overheating, be it a blocked filter or duct obstruction, must be addressed to prevent further risks.
Question 3: Can a thermostat set to “Auto” still cause airflow problems if the temperature settings are correct?
Yes, even in “Auto” mode, a thermostat can influence airflow. Consider a scenario where the fan setting is inadvertently set to “Off” instead of “Auto” or “On.” In this configuration, the blower will only activate during the heating cycle, potentially leading to stagnant air and uneven temperatures. A thermostat set to “Off” is like a conductor who only allows the orchestra to play during specific segments of the concert, disrupting the flow of music. The “Auto” setting ensures consistent air circulation, independent of heating or cooling demand.
Question 4: If some vents blow air while others remain still, does this indicate a problem with the entire heating system or just specific ducts?
Uneven airflow often points to localized ductwork issues. A collapsed or obstructed duct can restrict airflow to specific rooms or zones, while others receive adequate circulation. Imagine a branching river system, with some channels choked by debris while others flow freely. The problem lies not with the river’s source, but with the individual channels. Inspecting and clearing the affected ducts is crucial for restoring balanced airflow.
Question 5: How does a dirty air filter contribute to the problem of “house heater not blowing air”?
A clogged air filter acts as a dam, impeding airflow and forcing the blower motor to work harder. This added strain can lead to overheating, premature component failure, and ultimately, reduced airflow. The buildup prevents normal circulation that is needed to heat the room. A clean air filter is essential for maintaining optimal system performance and preventing the costly problem of “house heater not blowing air”.
Question 6: Can an old or failing capacitor directly prevent the blower motor from starting and cause no air to come out?
Yes, an old or failing capacitor will result in no hot air or blowing air. It provides the initial surge of energy needed to start the motor. Without this initial spark, the motor will not begin and there will be no airflow to the system and no hot air. This can be solved by replacing the capacitor in the furnace. The capacitor needs to be checked at least once a year for the best performance of the heating system.
In summary, the absence of airflow from a heating system often stems from issues beyond the heater itself. Thorough investigation into blower motors, ductwork, thermostats, and safety switches is essential for accurate diagnosis and effective resolution.
The next section will cover regular maintenance that a homeowner can do to prevent the problem of “house heater not blowing air” from ever happening.
Preventative Measures
The dread of a cold home, betrayed by a heating system that promises warmth but delivers only silence, lingers in the back of every homeowner’s mind. The problem: “house heater not blowing air.” It’s a scenario that can be largely avoided through consistent, proactive measures. Consider this guidance as an investment in future comfort, a shield against the chill.
Tip 1: The Vigilant Filter Replacement A story: an older couple diligently maintained their home, save for the unseen filter hidden within their furnace. Over time, dust and debris accumulated, choking the system’s airflow. One frigid January morning, their heating system fell silent, leaving them to shiver in the cold. The lesson: replace the air filter every one to three months, depending on usage and air quality. A clean filter is more than just good practice; it’s essential.
Tip 2: The Annual Professional Inspection A tale: a young family trusted their heating system to function flawlessly, year after year, without so much as a cursory examination. One winter, a corroded electrical connection caused the blower motor to fail, plunging their home into darkness. A qualified technician can identify potential issues before they escalate into full-blown failures. Schedule an annual inspection and cleaning.
Tip 3: The Ductwork Detective A cautionary tale: a homeowner noticed a gradual decrease in airflow over several seasons, dismissively attributing it to the age of his system. He later discovered that a section of flexible ductwork had collapsed beneath his home, restricting airflow. Inspect accessible ductwork for signs of damage, leaks, or obstructions. Seal any visible gaps or tears with appropriate tape.
Tip 4: The Thermostat Guardian Imagine a vacation home left unchecked. The thermostat’s settings accidentally lowered and caused frozen pipes. Ensure the thermostat is functioning correctly, accurately reflecting the ambient temperature. Consider a smart thermostat with remote monitoring capabilities for added control and peace of mind.
Tip 5: The Blower Motor Listener The old house creaks, the furnace hums, but all is not well. If the blower motor begins to whine, squeal, or exhibit unusual vibrations, it is broadcasting a distress signal. Attend to it promptly. Addressing it early can prevent a complete system failure.
Tip 6: Clear the Vents Keep vents unobstructed by furniture, rugs, or other items. This ensures proper airflow and prevents the system from working harder than it needs to.
Tip 7: Check Carbon Monoxide Detectors Malfunctioning heating systems can leak carbon monoxide. Having working detectors is life-saving.
Regular attention to these details minimizes the risk of a heating system’s silent betrayal. By proactively addressing potential problems, one ensures a comfortable and secure living environment.
With these practical safeguards in place, the journey towards a warm and worry-free winter is within reach. The final section revisits the overarching significance of maintaining a functional heating system.
The Cold Truth Revealed
The journey through the inner workings of a home’s heating system has revealed a stark reality: the silence of “house heater not blowing air” is rarely a simple matter. From the humble air filter to the intricate electrical connections, each component plays a critical role in ensuring warmth reaches its intended destination. The failure of any one element can disrupt the delicate balance, leaving residents to face the biting consequences. Diagnosing and rectifying this problem requires a systematic approach, a blend of technical knowledge and deductive reasoning.
Consider the story of a family, weathered by years of winters, who awoke to find their home gripped by an unexpected cold. The heater, their trusted ally against the elements, stood silent. Frustration quickly gave way to concern as temperatures plummeted. It was not merely a matter of discomfort; it was a threat to their well-being. This illustrates the deeper significance of a functional heating system. It protects against the dangers of hypothermia, prevents frozen pipes, and ensures a safe and habitable living environment. Maintaining a working heating system is not a luxury but a necessity. Safeguarding against the silence of a heater is safeguarding against the cold and the dangers that can accompany it.
