Why Your Air Conditioner Won’t Shut off And How to Fix it?

Air Conditioner won’t Shut off

Air Conditioners are a must household appliance to beat the heat of Summers. We all love to relax after work or do household chores under an AC. But what if you could not switch it off?

Air Conditioner Won’t Shut off: It is one of the most common problems people face globally. It causes power wastage, the home becomes too cool, and eventually disbalances your monthly utility bills.

This guide will explain why AC stays switched on and what could be done to troubleshoot the problem either by yourself or through a professional technician.

If you are taking professional help and waiting for arrival, switch OFF the breaker in the circuit board. It will switch off the AC immediately. It will save from further energy waste.

Meanwhile, if you’re taking matters into your own hands. Then read the problems and solution guide below regarding ac won’t shut off. 

What To Do If Your Air Conditioner Won’t Turn Off? (Solution)

1. Check Your AC Electrical Components Problem

A stuck relay switch can cause a continuous switch on. Your air conditioner contains numerous electrical components, and the relay switch is one of the crucial components.

A relay switch allows an electrical circuit to stay closed and facilitates the required quantity of power for the unit. It is advisable to consult a professional to repair or replace the troubled switch.

2. Check For A Dysfunctional Thermostat

If your air conditioner is more than ten years old, consider replacing the thermostat because a dysfunctional thermostat could also be the reason for abnormal AC function. With time, sensors accumulate dirt and debris that cause inaccurate room temperature readings. 

There might be loose and damaged wiring between the thermostat and the air conditioner. Loss of communication or interrupted connection can also cause such problems with your unit. Consult an authorized technician to check wires and clean the sensors. They can also replace the unit if required.

3. Check Your Thermostat Settings

Check your thermostat settings to ensure they are running according to your desired instructions. The air conditioner might function only when the unit fan is ‘On’—selecting the ‘On’ setting at the thermostat powers the fan and blower motor continuously, not only during the cooling periods. It will cause hot air to come out of vents because AC is not cooling.

In addition, if there is a difference between the set temperature and desired temperature, the air conditioner will keep running. Reset the thermostat according to your requirement and see if the problem is resolved.

4. Check Your AC Fan Limit Switch

Fan limit switch might get stuck in the override position that can cause continuous running of fan motor even when AC is not operational. You can reset the limit switch yourself or call an expert for any doubts and concerns.

5. Check For Dirty Condenser Coil

Over time condenser coil can accumulate dust and debris, restricting its capacity to push heat from the refrigerant. Condenser coil plays a crucial role in cooling our home, and if it is congested with dirt, the cooling power of AC will be affected, and the machine will keep running in an attempt to cool all parts of your house.

Keep the coils clean for cool and hygienic indoor air. You can refer to the manual and online videos about cleaning the condenser properly. It is advisable to make it a regular or weekly habit to experience uninterrupted air conditioning.

6. Check For Frozen Evaporator Coils

The frozen evaporator coil is another reason for the air conditioner malfunctioning. It happens mostly due to accumulated dirt and debris. AC unit cannot cool the home despite running for hours and causing you high utility bills. 

The unit issue restricts the coils from absorbing enough heat, so condensation is extracted from the air stuck on the surface of the evaporator coil during the cooling process.

It led to a thin layer of ice on the coils and prevented the refrigerant from receiving heat in the air. The machine gets clogged and holds moisture within the system as a process.

To resolve, the first thing is to keep the evaporator coils clean and regularly monitor them to restrict dirt and debris accumulation. If the problem persists, you should call for expert support. They might use heavy-duty equipment to clean it properly and repair the frozen evaporator coil.

7. Check Your AC Air Filter

Though a small component in the air conditioner, air filter plays a vital role in pure and hygienic indoor air. Sometimes it gets clogged with minute particles, pollutants, dirt, etc.

Therefore, it affects the health of you and your family. In addition, it also led to continuous switch on. It is advisable to either replace the air filter yourself or hire a technician.

8. Check Your AC Refrigerant Levels

ac refrigerant

Air conditioners come with a particular quantity of refrigerant for optimum cooling atmosphere. Sometimes refrigerants leak due to damaged coils, faulty components, and cracks in refrigerant lines. 

Leaks in refrigerant reduce capacity to cool, and the machine runs continuously to fulfill its shortcoming. This problem is a technical one and needs professional support. Call a reliable and trustworthy technician. They will check problem areas and do the required to solve the situation.

9. Check Your Blower Fan

A clogged blower fan can disrupt air conditioner functions. The machine kept running when it could not cool the room. A slow fan caused slower cooling and led to hours of AC operation. You can do the cleaning by yourself at home after reading the user manual and online tutorials.

10. Check Your AC Size

Air conditioners come in different sizes and capacities. It varies as per your home area, climate, and other local factors. If the size of the unit is too small for cooling your entire home, it will keep running.

As a result, improperly sized units consume more power, led to higher energy bills, and yet cannot cool your home because of lack of capacity. Check your home size, climate and buy an air conditioner that fits your home cooling needs. You can also contact local HVAC technicians for exchanging the unit. 


The air conditioner is a significant piece of equipment to handle extreme heat and humidity. If your machine does not stop, refer to the passage for the probable reason and resolve the issue. Contact a professional technician if you feel any concern or confusion.

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