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Honeywell Thermostat Heat On Blinking (Complete Guide) 2024

honeywell thermostat blinking heat on

Thermostats are essential home appliances, especially to maintain temperatures during harsh conditions. Honeywell thermostats are the most commonly used among users. If you want to buy a thermostat to suit your requirements, then Honeywell is the one!

Have you noticed that your screen blinks when the heat is on or that your thermostat is powering on and off more than it should? If your thermostat keeps flashing, this means the batteries are dying. But there are some other reasons too which contribute to this factor. In this article, we will talk about all those features briefly.


If your thermostat heat stops working or keeps blinking, it can be extremely frustrating. If you’re wondering why the heat keeps flashing in your thermostats, here are some reasons for this issue:

  • Power outage
  • Switching from cooling to heating
  • Dirty ac coils
  • Weak/dead batteries



Honeywell Thermostats are evolving, efficient and perfect for keeping your homes cosy. They help users keep suitable temperatures at home. But sometimes the thermostats can face issues like heat on blinking. In this article, we will learn the reason behind Honeywell Thermostat blinking heat on issue and the solutions to this bug. The problem can be in the control board due to heat blinks for hours or the incorrect position of furnaceΒ switches.

Electric issues usually cause power failure if there is any power outage at your place. This can be the reason for the blinking problem. When the power gets restored, your compressor might be pressured, resulting in heat blinking. Let’s learn about troubleshooting causes and tips to resolve the heat on blinking.

thermostat flashing heat on


A poorly attached or loosen wiring can be the reason for the Honeywell Thermostat flashing heat on. What you need to do is to check the connection between the wires and terminals to see if they are correctly connected and if nothing is damaged. See if something is wrong with the wires. A short or damaged one can also cause heat on blinking as well as cool on issue. Manually check the wires and fix them.


You may also want to see what is behind the covers. Open the filters and coils to inspect if they are clean or not. Dirt clogs the coils so the heat won’t come from them. A clogged coil restricts the airflow to the furnace. This may be the reason for the Honeywell Thermostat heat on flashing. Any clogged dirt affects the overall performance of your thermostats. Replace your filters or clean the old ones properly to let airflow.

The blinking may be the β€˜delay mode’. You need to check the furnace; it may need fixing. The constant blinking can be a signal being sent to the furnace. If the furnace does not turn on with heat, the thermostat does not show but instead blinks. Also, make sure the units are powered.


The voltage in your batteries might have drained, and your thermostat may blink as a warning. In Honeywell Thermostats, the display screen shows low battery warnings before causing any trouble. Take the sign and replace the weak batteries with new batteries.

Most batteries do not have the required voltage. Check the battery voltage from the battery compartment. If the voltage is low you might witness a blank screen. Insert the batteries into your thermostat and see if the blinking issue has been resolved.


It is very common for a circuit breaker to trip. Check the HVAC system of your thermostats, and flip back the breaker. Tripped breakers can also cause the Honeywell heat on flashing. Also, check the power switch near the furnace and turn it on if it is switched off by mistake. Sometimes thermostat’s heat mode can be turned on but still does not heat the room enough. In this case, check the sensors. If broken, get new sensors.


Check if the thermostat is set to β€œHeat” mode and if the β€œHeat On” button is blinking. This means that a safety timer for your thermostat’s compressor has been tripped. Once this stops the heat blinking, your thermostat should be able to maintain its heat setting again. The 4-5 minute blinking is the time delay. It protects your device from short cycling during any power outage. But sometimes you can also face certain error codes and you might not have an idea what each code means. Make sure you have sufficient knowledge on this subject.

FAQs Related To Thermostat Flashing Heat On:

Q: Why is my thermostat blinking heat on?
A: If your thermostat has been blinking for almost 5 minutes, it is the time delay. Time delay turns on the heat and protects your equipment from short cycling. If the thermostat blinks for more than five minutes, check its HVAC system.

Q: How to unlock the pro series Honeywell Thermostat?
A: To unlock the pro series Honeywell Thermostat, follow these steps:

  • Find the β€˜Lock’ symbol on display.
  • It will prompt a PIN code area.
  • Enter the PIN code of your device.
  • Use +/- to correctly enter the PIN digits.
  • Once you’ve entered the PIN code, it will automatically unlock your thermostat.
  • Then you can access your settings and customize them manually.

Q: Why is my Honeywell Thermostat blinking?
A: Your Honeywell Thermostat might be blinking due to weak/dead batteries, check if the C wire is connected properly, compressor failure or the flashing can be the time delay feature. And if it’s still blinking, reset it to its default factory settings or get a new thermostat.


I hope this article helped you resolve the heat blinking. The best thing about Honeywell Programmable Thermostats is that they give warning indications before any issue occurs. Before calling any technician and spending money, use all these troubleshooting solutions and learn more about the thermostat’s components. Although Honeywell Thermostat heat on flashing doesn’t cost you much, our guide will still be enough to help you.

Blinking heat is a common issue with Honeywell. I hope all these helpful tips assist you in resolving the issue. If these tips don’t work, reset your Honeywell Thermostat flashing heat or call the technician.

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