In the video “HVAC Furnace/Air Conditioner Thermostat Blank – 10 Reasons Why” by Word of Advice TV, you’ll discover 10 possible reasons why your thermostat screen may be blank. The video covers common issues such as dead thermostat batteries, tripped circuit breakers, off furnace power switches, blown fuses, and overheating furnaces. It also mentions related topics like thermostat wiring, AC tripping breaker, low voltage shorts, and replacing a thermostat. The video provides playlists for more repair videos and offers options to donate to support the channel. A disclaimer advises that all repairs should be done by a trained professional and that Word of Advice TV is not responsible for any damages or injuries caused by the use of the information provided. If you’re experiencing a blank thermostat screen, this video can provide you with useful insights and potential solutions to get your HVAC system up and running again.
If you’re curious about the possible reasons and solutions for a blank thermostat screen on your HVAC furnace or air conditioner, look no further than the informative video “HVAC Furnace/Air Conditioner Thermostat Blank – 10 Reasons Why” by Word of Advice TV. Covering a range of issues that are often easy to fix, this video explains potential causes such as dead thermostat batteries, tripped circuit breakers, and off furnace power switches. It also offers references to related videos on topics like thermostat wiring, circuit breaker replacement, and replacing a furnace air filter. Furthermore, the video provides playlists for more repair videos and even offers options to donate to support the channel. While it’s important to seek professional assistance for appliance and HVAC repair work, this video can be a valuable resource in troubleshooting and understanding common issues with a thermostat screen going blank.
HVAC Furnace/Air Conditioner Thermostat Blank – 10 Reasons Why
Is your home furnace or air conditioner HVAC thermostat screen blank and you have no idea why? In this article, we will explore the top 10 reasons why a thermostat could go blank and provide simple solutions to fix these issues. Most of these problems can be easily resolved, allowing you to get your furnace or AC back up and running in no time.
Reason 1: Dead thermostat batteries
Some thermostats require batteries to operate. If your thermostat screen is blank, the first thing you should check is the batteries. To access the batteries, you will need to remove the thermostat face from the wall. If you can’t remember the last time you replaced your thermostat batteries, this could be the reason for the blank screen.
Reason 2: Tripped circuit breaker
A tripped circuit breaker can also cause the thermostat screen to go blank. Power spikes, outages, or thunderstorms can trip the breaker. To fix this issue, try resetting the circuit breaker by switching it off and then back on. If the breaker continues to trip, there may be a short inside the furnace or air handler, or the breaker itself may be faulty and need replacement.
Reason 3: Off furnace power switch
Sometimes, the furnace power switch can accidentally be turned off, causing the thermostat screen to go blank. This can happen when replacing a filter or due to kids playing near the switch. Check if the power switch is in the “on” position. If it’s turned off, simply turn it back on to restore power to the furnace or air conditioner.
Reason 4: Blown 3 amp fuse
In some systems, there is a small 3 amp fuse that can blow, causing the cooling and heating functions of the HVAC system to stop and the thermostat screen to go blank. If you find that the fuse is blown, it indicates a short circuit in the low voltage side of the system. It is important to identify and fix the underlying issue causing the fuse to blow.
Reason 5: Overheating furnace
All furnaces have a safety temperature sensor that shuts off the furnace if it gets too hot. In some systems, this sensor is wired in series with the thermostat. If the sensor trips and opens, the thermostat may go blank. Overheating can be caused by a dirty air filter, blocked vents, or other issues. Replacing the air filter is a good first step in addressing this problem.
Reason 6: Tripped safety overflow switch
The evaporator coil of an air conditioner has a drain pan underneath it to collect condensation. If the drain line becomes plugged, the drain pan can overflow, tripping a safety switch and causing the thermostat to go blank. Check if there’s standing water in the drain pan, and if so, clear the drain line to resolve the issue.
Reason 7: Open door switch
Most furnaces have a safety switch behind the bottom door. If the door is left open or not properly closed, the switch opens and cuts off power to the furnace or air handler, resulting in a blank thermostat screen. Ensure that all furnace doors are securely closed to restore power.
Reason 8: Incorrectly wired thermostat
If you recently replaced your thermostat and noticed that the screen went blank shortly after, there’s a possibility that it was wired incorrectly. Ensure that the wiring is correct by referring to a basic thermostat wiring diagram. Incorrect wiring can prevent the thermostat from functioning properly.
Reason 9: Bad thermostat
In some cases, the thermostat itself might be faulty. If you have checked all the other possible causes and are still experiencing a blank screen, it may be necessary to replace the thermostat with a new one. Consult a professional if you are unsure how to proceed with this step.
Reason 10: Rare case scenario involving control board issue
In rare cases, a blank thermostat screen can be attributed to a control board issue within the HVAC system. This requires professional diagnosis and repair. If all other potential causes have been ruled out, it is recommended to contact a trained professional to address the control board issue.
Conclusion
Experiencing a blank thermostat screen can be frustrating, but with these 10 reasons why it may occur, you can troubleshoot the problem and potentially resolve it on your own. Remember to always prioritize safety and consult a professional if you are unsure or uncomfortable with performing any HVAC repairs.
