You probably rely on your thermostat to keep the air in your house cool and pleasant. When you get home following a hard day at work, all you want is a pleasant temperature. But, how would you feel if your thermostat clicks but AC does not turn on?
Super frustrating, right? But, don’t worry. This guide explains all the possible fixes that can help you troubleshoot if your AC clicks but doesn’t turn on.
There may be a problem with your air conditioning if your AC is not turning on. We’ll show you the simplest ways to diagnose your AC unit in this article, along with the most effective ways to find the root of the problem and fix it.
Also Read: Thermostat Not Reaching Set Temperature
Why thermostat clicks but ac does not turn on?
We have put together a comprehensive list to assist you in identifying the cause of your AC not turning on, which might range from maintenance problems to your unit becoming older.
Let’s discuss each issue:
1. Circuit breaker tripped
Circuit breakers are made to turn off when they receive excessive power. This is advantageous. It offers fire protection for your house. Breakers may trip because too many appliances are being used at once, or perhaps one of the appliances is too old and uses too much power.
Whatever the reason, if the breaker that feeds power trips, your air conditioner won’t work.
2. Faulty thermostat
The thermostat may occasionally emit a gentle clicking sound as it asks for cool air or after you adjust its settings. This is because a relay component, which opens and shuts to switch your air conditioner on and off, is causing this noise.
This clicking sound shouldn’t be too loud if your thermostat is correctly fastened to the wall. However, the thermostat could be broken if the AC won’t switch on and you hear a loud clicking sound.
3. Ineffective control board
After receiving a command from the thermostat, the control board instructs the electrical signals to switch on or off to various components of the air conditioner, including the blower.
An electrical control issue on control boards occasionally results in relays timing out and failing, which produces the clicking sound.
4. Blocked air filters
Soiled or blocked-up filters might prevent your AC from functioning correctly. So no matter what kind of air conditioner you have, you must always clean the filters.
The filters’ responsibility is to guarantee proper airflow. Unfortunately, airflow is essentially obstructed if they are overflowing with trash. The cooling system of your home has to work harder in this condition in order to keep your home comfortable. The cooling system of your home has to work harder in this condition in order to keep your home comfortable. Over time, it may cease functioning.
5. Faulty contactor
Your contractor has a large relay that switches the outside unit on and off. The “middleman” who connects your compressor and thermostat is your contactor. Your contractor initiates the process of activating your compressor as soon as the thermostat transmits the cooling order.
However, if it’s broken, it can’t carry out the instructions from your thermostat, and your AC won’t turn on. Instead, the thermostat is sending you a signal, which is why you can hear it clicking.
6. Defective capacitor
Your outside unit houses your capacitor, which functions as a large battery to provide your AC compressor with the extra energy it needs to start.
However, not all ACs feature capacitors to aid in their startup. Capacitors are typically added to older AC units that require a little additional assistance to start. Like batteries, capacitors lose their charge over time and can no longer provide the necessary kick-start for your AC to switch on.
7. Contaminated evaporator coils
Your air conditioner’s evaporator coils, condenser, or filter may become covered in dander, grime, dust, and other unsavory detritus from your daily life.
ACs consists of several parts that accumulate waste over time. Debris accumulating on various AC components reduces system efficiency and may eventually cause a complete failure and can produce a clicking sound.
8. Leak of refrigerant
Coolant is refrigerant. In contrast to an automobile, it does not need to be added frequently. While an AC unit is functioning properly, there is no need to add refrigerant.
Your AC won’t function properly if you have a freon leak. There is also the possibility of refrigerant toxicity.
We now understand the cause of this issue. So let’s look at how to solve each below.
How to Repair a Thermostat That Clicks But Doesn’t Work
Once the underlying problem has been identified, you must decide whether to seek expert assistance or attempt to fix or replace the broken component yourself.
As we go through some of the best ways to fix an AC unit that won’t come on even if the thermostat is clicking, please continue reading.
1. Repair thermostat problems
Your air conditioner and you may communicate with each other through your thermostat. Therefore, your AC cannot detect when it has to be turned on if the thermostat is malfunctioning.
First, check the screen on your thermostat. Then, attempt to turn on your thermostat if it is off or has a blank display.
It’s also possible that the batteries in the thermostat are dead if they won’t turn on. So make careful you change the thermostat’s batteries.
If your thermostat still doesn’t turn on, it could be time for a replacement. This is because there can be an electrical issue with your thermostat. Therefore you will need a qualified specialist to examine it.
2. Fix Circuit Breaker Trip
Switching off the circuit breaker is a common issue. For example, a circuit breaker may trip if too many appliances are used simultaneously. It could also take place after a storm when there are power spikes.
Locate your electrical panel, then examine the AC switch. Flip the switch to “ON” if it is currently “OFF.”
Do not attempt to turn the circuit back on if it trips repeatedly. The circuit is overloaded for whatever reason, and turning it on might start an electrical fire. Instead, make an emergency call to an electrician.
3. Fix wiring issue
How many electric appliances do you have in your house overall? Do lights frequently flicker on and off? Are there any appliances that hum when you initially plug them in? Before the pudding hits the fan, wiring issues frequently show themselves in advance.
If you frequently encounter any of these, you’ll need an electrician to address the root issue. In addition, a diagnostic test must be performed by an HVAC expert if it has harmed your AC unit.
4. Fix False Temperature Readings
It’s also conceivable that your thermostat is sensing the temperature in your house incorrectly and turning off on its own.
This can occur if your thermostat is placed near a location in your house that experiences considerable temperature swings, such as a laundry room or kitchen, or on a wall that faces the outdoors.
You must place the thermostat in a new position to resolve this problem.
5. Replug Condenser Unit
Examine the cord that exits your air conditioner visually. For example, the issue may be as simple as the AC not being plugged in if you have a window unit. Typically, a little brown cord from your air conditioner will be attached to a panel on the side of your house.
These cables have the potential to be chewed through or disconnected. This will restrict the energy from going to your air conditioner, stopping it from turning on.
6. Remove Blown Fuse
The fuse box is outside of your house, next to the condenser. We advise turning off the electricity and the air conditioner, as we do with every item on this list. We must emphasize this. Failure to comply with this risked electrocution.
After finding the fuse box and cutting off the power, remove the fuses and use a multimeter to check for continuity. You may buy a replacement fuse at a hardware shop or from internet vendors if one of the fuses breaks. Just make sure to snap a picture of it to have the make and model ready.
7. Fix Clogged Air Filter
The filter collects dust, pollen, and other debris that block it during this procedure. Set your air conditioner to the “OFF” position before determining if this is the problem.
Replace the air filter after shutting off the breakers that give it power. You’ll need to wait a while for the ice to defrost after you’ve changed it. Before this occurs, avoid turning on the air conditioner because doing so might harm the machine.
If you don’t have the time or patience to do this, you could speed things up using a blow dryer on the lowest setting.
8. Clean the pilot ignitor
When the thermostat clicks on, the pilot ignitor may become too clogged with dirt and accumulation over time to light the furnace. Without this ignition, you won’t be able to heat your house for those chilly winter nights.
If the furnace’s front panel is removed, you can peek inside to determine if the pilot ignitor is the problem. Finding out whether this could be why the thermostat clicks but doesn’t produce any heat.
The important thing to remember is that you should only be checking your furnace’s pilot ignitor. A trained technician should do the actual cleaning tasks. It may be complicated and dangerous for the common layman to manage this component.
9. Confirm The Capacitor’s condition
The system has been adjusted, and the filter and the pilot ignitor have been cleaned, but the thermostat is still acting strangely. The issue might be the capacitor. The electrical charge that the system utilizes to start the compressor is kept in this device. Thus, it serves as a battery.
If the thermostat clicks, followed by a buzzing sound, the capacitor may malfunctioning. Although the compressor may be heard initially, it lacks the actual charge in the capacitor.
You might not be able to solve this problem. But because you know the capacitor is damaged, you should get a professional to address it. Recall that the capacitor has some voltage stored in it. Therefore, it can startle you if you handle it incorrectly.
10. Adjust the thermostat’s setting
Nothing happens despite the thermostat clicking. This may be happening because your thermostat is adjusted incorrectly. You must set the thermostat to a temperature that necessitates warming the air for the furnace to turn on. To test the system, you can try raising the specified temperature significantly.
Your thermostat’s other settings are also necessary. First, verify that the toggle is set to the proper seasonal setting. For the winter, the system switch should be set to “heat” or “auto.” Additionally, the fan should be set to “on” or “auto.”
11. Examine the breaker
The absence of electricity is one of the fundamental reasons a thermostat clicks, but the furnace doesn’t turn on. Although it would seem like one of the first things you should do, many homeowners overlook this action.
It’s entirely conceivable that the breaker has been switched if there was a recent surge in energy in your area. It is understandable why the thermostat clicks when there is no electricity but no heat or air conditioning. After checking your home’s breaker box, you must ensure that the furnace is switched on.
12. Fix AC motor malfunction
The component that charges the air conditioner’s motor is the capacitor. A bad capacitor may be to blame for your air conditioner’s inability to switch on if it is more than 15 to 20 years old.
Use a multimeter to see if this is the problem. Before testing your AC motor, don’t forget to turn off the AC and cut off its power source. You can rule out the motor as the likely offender if it turns out to be in working order.
13. Verify the relay
The click of the thermostat signals the completion of a relay circuit. The air conditioner is expected to receive a signal from this circuit telling it to switch on. The air conditioner is never turned on if it doesn’t arrive.
The relay lines leading to the air conditioner only need to be broken once to prevent the symbolic baton from passing. By doing the following, you can determine whether the thermostat may be having these issues:
- Look at the thermostat wire to see if any connections are loose.
- In your home’s breaker box, you can try to reset the thermostat by turning off its breaker. Switch the breaker on and wait a few seconds. Restart it after that. After this, the thermostat probably has a problem if it doesn’t recover.
- Have someone nearby the thermostat when you do flick the switch. Do you notice that the clicking is louder than usual? Or does it click more than once? The thermostat is then probably to blame.
14. Unclog a clogged drain pipe
Lack of upkeep will eventually result in the AC becoming clogged with muck and overloaded with moisture.
Pouring a cup of boiling water down your drain pipe around once a month can help maintain your condensate drain line clean. Before doing this, make careful to switch off the electricity and the air conditioner.
15. Now its time to call the experts
The majority of the fixes mentioned above involve do-it-yourself methods. Try your best, but if your thermostat continues to click but does nothing, you should contact an HVAC system expert.
Your system may have a problem that goes beyond what you can fix. Keep in mind that it is never safe to have a thermostat that clicks but does nothing. So, to be on the safe side, consider this control action as soon as possible.
Several DIY fixes you may attempt at home if your thermostat clicks but does nothing since it may be experiencing one of the abovementioned problems. Even though most of these procedures only take a few minutes, they might save you hundreds of dollars in future maintenance costs.
The nice part is that if you use any of the options mentioned above, you can always get beyond this issue.
Keep trying from the top until your thermostat starts to operate regularly once again. If none of these work, don’t be afraid to ask an HVAC system expert for assistance.
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