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For any homeowner, a blank thermostat screen can be an alarming sign, especially in the hottest part of the summer or in the dead of winter. Is it just a case of needing to replace the batteries? It is an issue that is going to be very expensive to repair? Is there any faulty wiring? Maybe the entire HVAC system has broken down, and it needs to be replaced!

Don’t panic just yet. If the screen on your thermostat is blank, there might be a straightforward solution to the problem. The following are some of the common causes for a blank thermostat screen, and how to fix it.

Whenever your heating and cooling isn’t meeting your expectations is when you tend to take a look at it and fiddle around with it. A thermostat, like all other working parts, is vulnerable to having issues. Have you ever wondered what causes the thermostat to go blank and then turn back on? That is an indication that the thermostat has a part that isn’t working correctly.

The thermostat is one of the most critical components of all HVAC and AC units. It senses what the temperature is and helps to keep it regulated at the specified level. A thermostat works similar to a switch. Usually, they are heated activated. The temperature sensor is one component of the thermostat. It triggers the switch to close or open, by interjecting or completing an electrical circuit that operates the cooling and heating systems of a house.

Your thermostat is going blank and then coming back on; that is a classic sign of short cycling. Usually, this problem originates within the heating system. The cycle on an air conditioner, on average, lasts for about 20 minutes. Sometimes, there is an increase in the number of cycles. The problem is referred to as “short cycling.” This term refers to situations where the air conditioner turns off and on in small bursts. When that happens, the home does not adequately cool down or heat up. You can see an indication of short cycling with your own yes when your thermostat goes black and then repeatedly comes back on in quick succession.

An AC thermostat has a temperature sensor that measures the surrounding temperature. The thermostat uses the reading to send “off” and “on” signals to the unit’s compressor. The thermostat should ideally not be installed close to a window that gets lots of sunlight. It should also not be installed close to a supply air vent. The thermostat will be confused by these places about what the actual temperature is inside your house.

The actual thermostat might have a fault, and that could be the cause of the short cycling. It might be something basic like a loose wire, or it could be something more serious, which might need to be replaced. A local HVAC technician can validate this for you. Although it isn’t a significant issue to have a faulty thermostat if you replace it will solve the problem of the thermostat repeatedly switching off and on.

These leaks occur due to wear and tear on the coils and corrosion. If there is also a refrigerant leak in your AC, it means that the unit might have a low Freon level. The refrigerant or coolant is essential for absorbing heat in the air and then cooling it down. So anytime it is low, the compressor’s pressure level can become uneven, which can cause it to turn off and on intermittently. This, in turn, can cause the thermostat to go off and on repeatedly. If it is left unattended, this problem might seriously damage the unit. If you notice any signs that there is a refrigerant leak, make sure that you address the problem as soon as possible.

The AC might have a clogged or dirty air filter, which causes airflow restrictions. Whenever the flow of air is restricted, it freezes the evaporator coil ad that causes the AC unit to turn off and on. As previously mentioned, that can cause your thermostat to go black and then turn on again. It is essential to clean your air filters and replace them, if necessary, once a month, at least. If you are in an area where dusty is in the air continuously and you run your AC regularly all summer, then you might need to replace the filters more often.

Not every AC unit thermostat needs batteries. However, some of them do. When the batteries are weak, it may cause the screen on a thermostat to go blank and turn on again. First, you need to determine if this is the situation with your thermostat. If so, take the front panel off of the thermostat and then add new fully charged batteries to replace the old ones. This is a task that you can easily do yourself.

If your thermostat is blank, the first thing you should do is check the batteries. Chances are, the batteries have died and the thermostat simply can’t power on. Replace the batteries and see if your thermostat turns on. If not, proceed to the next step.

Typically, thermostats are connected to a home or business via the main electrical system. Sometimes, the thermostat or another source of electricity can cause the breaker to trip (similarly to how a hair dryer can trip the breaker for example).

If you’ve checked the batteries already, check the breaker. If it the breaker has tripped, simply flip the switch back on and check if this restores the thermostat screen.

Worst case scenario, your thermostat is at the end of its life and simply needs to be replaced. While all thermostats are different, the average device has a life expectancy of about 10 years.

If your thermostat is blank and you’re not sure why,contact the team at A+ Air Conditioning and Refrigeration. Your home’s comfort is our number one priority.

We offer high-quality air conditioning and heating repairs for Gainesville, Florida homeowners, and can diagnose what is causing your thermostat to malfunction and provide the right solution.

Thermostats are the brains behind HVAC systems used to manage and control temperature and comfort levels indoors. Once the user has set the desired temperature, the thermostat calls for heating or air conditioning, depending on the setting. Like most things today, innovation has led to significant changes with thermostat technology. Smart thermostats can control the HVAC and perform other functions like unlocking doors, controlling lights, and operating security cameras. Additionally, users can monitor and control all of these functions from devices like smartphones and tablets.

There are many advanced thermostats on the market today from various manufacturers. Trane produces both programmable and non-programmable thermostats in various models to control the temperature of your space. They also offer groundbreaking devices with unique features and advanced technology. Many users agree that Trane offers some of the best smart thermostats with easy-to-manage temperature controls and Wi-Fi. These devices have proven efficient, durable, reliable, and ideal for crafting the perfect home environment.

Like other pieces of technology, there are also detailed troubleshooting instructions to help homeowners manage any issue that may arise with their Trane thermostats. Since smart thermostats have become complex pieces of equipment, a few things can be checked if there is an issue. Let’s look at how you can try to resolve a Trane thermostat blank screen.

If you are experiencing a blank screen on your Trane thermostat, the problem could be as simple as dead batteries. While some thermostats don’t require batteries, several models do. If the batteries in your device have gone bad, your screen isn’t getting any power and will not respond. To replace the batteries, remove the front cover of the thermostat from the wall plate to access the battery slots at the back. Once you change the batteries and replace the cover, your thermostat should power back up. Be sure to purchase quality batteries and replace them as often as you change the batteries in your smoke detectors. Having a routine will ensure that you never have battery problems with your thermostat.

In some instances, users have mistaken a dark screen for a malfunctioning blank screen. The LCD screens can look blank if they are too dark, especially if viewed from a distance. You can resolve this issue by bringing up the brightness on the screen. If this is the case, you can refer to the owner’s manual to determine how to access the settings and adjust your screen brightness.

Electrical problems are the most common cause of blank screen issues. In some instances, the fuse could have gone bad and is no longer allowing electricity to flow to the circuit. You can check and replace a malfunctioning fuse to restore power to the screen. Additionally, you will experience a dark screen on your Trane thermostat if your circuit breaker trips. A tripped float switch will also cause a screen issue and can be resolved by resetting your circuit breaker. Other electrical problems from poor wiring due to installation issues could also create an issue. For these problems, you may need to contact a qualified HVAC technician.

Another common issue that could impact thermostat operation is dirty housing. Over time, dust can collect inside the thermostat and interfere with the screen. To clean the housing, you can remove the front cover and use canned air to remove the dust and other particles that have collected inside. This is a simple problem, but it can cause a malfunction with your thermostat.

A Trane thermostat can be a great tool for controlling and managing the temperature in your home. If you find that the screen on your device is acting up, you can try the above tips for troubleshooting the issue. If you cannot resolve the problem yourself, you may need to contact a qualified HVAC technician to diagnose and address the issue.

It’s an “Oh no!” moment when you approach your home’s thermostat and see its screen is blank. Is it serious? Does it mean your furnace, heat pump, or air conditioning is broken? Not necessarily. In fact, most of the time, it’s something minor and can be easily fixed.

If your thermostat wall does not have a c-wire, or common wire, your thermostat most likely is not hooked up to your HVAC system for its power and needs batteries. When your screen is blank, it could indicate you need to replace the batteries. It that is the case, you typically need AA alkaline or 3-volt lithium batteries, but see what type is currently powering the thermostat and simply replace them. Most thermostats display a low-battery symbol when the juice is running low.

On the other hand, if your thermostat is hardwired to your HVAC system for power, it could be a temporary blank screen if the thermostat is in the middle of recharging. Wait a short time and see if the display returns. If it does not, read on.

Sometimes the wires hooked up to your thermostat are responsible for its lack of power. If they were not firmly attached originally or the thermostat is in a high-traffic room, the vibrations from people walking by can sometimes affect the wires. Our technicians have also seen wires chewed by rodents in attics affect the wiring. Since wiring deals directly with electricity, we recommend you calling us to diagnose and repair the issue for you. When it comes to electricity, it’s better to be safe than sorry.

A quick fix to restore your thermostat’s power is a tripped circuit breaker or blown fuse, depending what you have in your home. Sometimes a surge can cause this issue. If you check your electrical box and a circuit breaker is tripped, just flip it back. If you have fuses, replace the fuse. Once this is done, check your thermostat. If you have power again, you are set; but if the breaker trips again or the replacement fuse blows, you have a more involved HVAC problem. You need to get a professional involved.

HVAC systems have built-in safety switches in the case of an unsafe situation. In the event a safety switch on one of your units is tripped, the transformer supplying voltage to your unit (and possibly your thermostat) will stop power. If this is a furnace, you need to call in a professional for a diagnosis and repair. If it’s your heat pump or air conditioner, check its condensate pan to see if it’s full. As a safety precaution, this will trip the safety switch. Empty the pan and see if power is restored to your unit and thermostat. If not, you need a professional.

Every once in a while, our technicians come across this issue. Some thermostats are more sensitive to this issue than others, but it is something worth checking. If your furnace door is not closed tightly, your thermostat will turn off. Simply closing the door securely should restore power if this is the cause.

Though thermostats can last 10 to 20 years, they do wear out. Sometimes it is just time to replace it. If your thermostat is older, unfortunately this may be the problem. If it is, be sure to have a professional install the new one, since the newer ones can be complicated, and you want to be sure you will not have issues with it in the future.

At Trouth Air Conditioning and Sheet Metal here in Sulphur, Louisiana, we frequently field phone calls regarding thermostat issues. If your thermostat has a blank display, try these ideas to see if you can restore its power. But if they are not solving your problem, or if you are hesitant about attempting these on your own, please call us at 337-527-8683. We would be happy to help.

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Heating or cooling room thermostat batteries & backujp power sources: What is the role of the battery in a room thermostat? How do we diagnose and fix a blank thermostat display?

Page top photo: a basic room thermostat showing the red and white wires being switched by the thermostat and a place where it"s easy to check for voltage at those terminals.

Some programmable digital room thermostats include an internal battery that will allow the device to remember the program that you have set even if there has been a power outage.

All programmable digital room thermostats are designed to return to a "safe" or "standard" temperature program to be sure that heat or air conditioning will continue to work in some reasonable range in case a power outage or dead internal battery causes the thermostat to forget how it was programmed by the user.

Watch out: some room thermostats require a battery to operate at all. These wall thermostats do not use power from the 24V thermostat wiring system and its low voltage transformer, and typically these thermostats will have larger batteries than those using battery power only for temporary backup.

Jeanie, the Hunter 44422 you are discussing is a Hunter Fan Company programmable thermostat. You can get product information and instructions at the company"s website www.hunterfan.com or contact the company directly at Hunter Fan

This thermostat is not designed for use with 110V/220 V systems. If you are unsure of what kind of heating and cooling system you have, please contact a qualified HVAC Technician for assistance.

The batteries in this unit, or at least the one that I examined, are in the back of the hinged, removable thermostat assembly. You"ll have to un-clip the thermostat from its top, swing it down and out on its hinge, and you"ll see that using a plug connector the entire assembly is removable to make it easier to change the batteries without breaking something.

When the batteries are weak, the CHANGE BATTERIES warning flashes until three new AA alkaline batteries are installed. If the batteries become too weak for normal operation, the thermostat enters the second battery power shortage mode.

When no battery power is left, the BATTERIES USED UP warning flashes on the display and the system turns off. The system remains off until new batteries are installed. The thermostat resumes normal operation after new batteries are installed.

Reader Question: Our digital thermostat is blank - what causes the thermostat LCD screen to go blank and refuse to respond when I press thermostat keys or controls?

When we came home from the store the digital thermostat was blank. We tried to take off the face of the thermostat to look for a battery as we were doing that the thermostat kicked on. Problem was it started to blow hot air. We went back to the thermostat and when we fiddled with it it went off but then came back on this time it blew cold air. Everything fine right?

Not so fast. In the middle of the night I woke up drenched with sweat. For some reason the AC started blowing hot air. I simply touched the thermostat and it went blank. I haven"t touched it since.

When the display on a digital thermostat goes blank that means that power has been lost to the unit. Power for a digital TT comes from one or at most two sources:

The low-voltage transformer mounted somewhere, often near the electrical panel or near the heating or cooling equipment supplies normal power to the thermostat; if one of those wires is disconnected, the transformer burned up, or power to the equipment where the transformer is mounted is turned off, the thermostat will go blank

Some thermostats also use a backup battery to remember settings when someone has turned off power or there has been a power outage. If the batteries are dead that"d be a second reason for a blank display. This is a less serious concern, as thermostats have a fall-back default program that will get things running after a power outage - which takes us back to reason #1 - power is off to the thermostat.

Next, check the thermostat setting mode and physical switches. Trane gives this advice if the display on their TCONT800 series Touch Screen programmable thermostat (illustrated at above left) is blank or not responding to touch:

If the display is not entirely blank, but does not respond to touch, check the thermostat"s Advanced Settings to see if the device was put into locked mode.

THERMOSTAT BACKUP BATTERIES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

All Proliphix Network Thermostats come with our free Uniphy Remote Management Service. This unique offering lets you monitor and control your HVAC systems by simply pointing your Browser to our secure Proliphix Web Site. Enjoy the convenience of programming a thermostat from any location, using a simple graphical interface. No computer equipment or software is required. And since Proliphix takes care of the network configuration for you, you’ll be up and running in no time. We’ll even proactively monitor your thermostats and send you an immediate email or SMS message when an HVAC problem is detected.

[4] Honeywell Corporation, Honeywell T451A, T651A, T694A,B,D,F Light Duty Line Voltage Thermostats, [installation, troubleshooting manual], 1992, Honeywell Consumer Products,

"T451, T651, T694 Thermostats provide on-off control of valves, fans, motors, contactors, electric heat elements, duct furnaces and fan coil units in heating/cooling systems. Switching sub-bases provide manual control of heating, cooling and fan."

[6] Honeywell EConnect™ Wireless Thermostat Kit TL9160AR System Installation Guide, retrieved 3/15/13, copy on file as Honeywell_EConnect69-2474EFS.pdf

[13] "Automatic Oil Burner Controls - Thermostats", Domestic and Commercial Oil Burners, 3rd Ed., Charles H. Burkhardt, McGraw Hill, 1969 (and later editions), ASIN B0000EG4Y8

[15] Trane TCONT800 Series Touch Screen Programmable Comfort Control Ownes Guide, American Standard, Inc., Troup Highway, Tyler TX 75711, January 2005, Telephone: Customer Service: 1-877-3381, website: www.trane.com