Honeywell Home Pro Series Thermostat Troubleshooting

By | August 6, 2022

RobotPoweredHome is reader-supported. When you buy through links on my blog, I may earn an affiliate commission. As an Amazon Associate, I earn from qualifying purchases.

Thermostats accept become a necessity if you desire to maintain a comfortable home temperature. However, similar many other dwelling house appliances, thermostats tend to malfunction due to a software consequence or a hardware problem.

Recently, my Honeywell thermostat started acting up. Its brandish went bare, and the HVAC system was not working properly.

However, instead of opting for professional person help, I decided to troubleshoot the organization myself.

Turns out, thermostat bug are pretty common, and there are several troubleshooting methods that y’all can try to go the organization working again.

There is a lot of data on the internet, merely most of it is scattered. Hence, to assist you through the process of troubleshooting your Honeywell thermostat system, I take compiled this article.

The commodity explains how to decide the type of thermostat y’all accept and what troubleshooting method will work best.

If your Honeywell Thermostat is not working, troubleshoot by changing the batteries or past performing a difficult reset.

What Model of Thermostat Do I Have?

Honeywell makes three different types of thermostats. If you lot are unsure of what thermostat is installed in your business firm, minor pointers can help you determine the type.


A manual thermostat volition either exist dial-shaped or volition accept a dial on pinnacle of it, similar to what you use on a microwave to fix the time.

These manual thermostats are not very common present and can only be found in old buildings.


If your thermostat has a digital screen but does not come with a companion app, it is nigh probable a programmable thermostat. The screen too has a few buttons that yous can use to scroll around the menu.


Smart thermostats usually accept a large, vibrant display and a few buttons to change the settings. Nigh of its controls tin exist accessed using the companion app installed on a tablet or a smartphone.

As far equally the model of your Honeywell thermostat is concerned, it is written on the thermostat ID card that comes with information technology.

Withal, if you live in a rental or have misplaced the ID, y’all can find the model number by removing the thermostat from the wall plate.

Almost Honeywell thermostats tin can be removed by simply pulling them from the wall plate. If it does not come off, endeavour sliding or flipping it. The model number is mentioned at the back.

Popular:   Best All Season Tires For Jeep Grand Cherokee

Note that sudden jerks or mishandling can impairment your thermostat. Then, don’t fiddle with it if it does not come off easily.

Mutual Honeywell Thermostat Troubles

Troubleshooting a thermostat is not a difficult task. The main issue lies in diagnosing the problem. Hither are some of the most common thermostat troubles.

Display is Bare on Your Honeywell Thermostat

The display usually goes black due to the following reasons:

  • Drained batteries
  • Disrupted ability
  • Open furnace door
  • Disconnected C-wire

To prepare the upshot, replace the batteries if yous have a programmable thermostat. On the other mitt, if yous have a manual or smart thermostat, ensure that the power wiring is not disrupted.

In addition to this, make sure the power for your air handler and furnace is flowing (switch is turned up) and the air handler doors/panels, as well as the furnace cabinet doors, are tightly shut.

If the problem persists, y’all might have to replace the thermostat. Unfortunately, blank display issues cannot be stock-still past troubleshooting.

HVAC Unit Won’t Work

Some common HVAC issues are:

  • Sends out absurd air in heat mode.
  • The system is not responding.

As giddy equally this sounds, before panicking that your HVAC system is faulty, ensure that your thermostat is set to “cool” or “oestrus” according to the temperature. It would be all-time if you did not switch it off.

Apart from this, while setting the temperature, make sure it is either ready college or cooler than the room temperature.

Moreover, if the air handler doors/panels or the furnace cabinet doors are open, the HVAC system does not work properly.

If the solutions mentioned higher up don’t work, try checking and resetting the circuit breaker. Once the system comes dorsum online, wait for five minutes for the compressor to plow on.

“Cool On” or “Rut On” is Blinking

The ‘Cool On’ and ‘Heat On’ indicators denote what arrangement is running at the moment. If your thermostat is switched off, information technology will non display either of the indicators.

Yet, if the “Cool On” indicator is blinking, or even the “Heat On” indicator, don’t worry; your system is in a five-infinitesimal delay state. This is a built-in safe characteristic called ‘compressor protection timer’.

Information technology prevents the thermostat from brusk-circuiting if the ability goes away and comes back suddenly.

How to Troubleshoot A Faulty Honeywell Thermostat

Some of the methods you can try to troubleshoot a faulty Honeywell thermostat are:

Popular:   How Long Does The Average Electric Car Take To Charge

Change the Batteries

In most cases, changing the batteries resets the system settings to their original state, eliminating whatever problems acquired by software bugs.

  • Disconnect all the wires continued to the thermostat. Make sure you don’t mix them up while reconnecting.
  • Remove the device from the wall plate.
  • Remove the batteries and wait for five minutes.
  • Supercede the batteries and reconnect the wires.
  • Turn on the arrangement and wait for five minutes.

It’s possible that your Honeywell Thermostat will proceed to non work afterward changing the batteries.

Check for any Ability Disruptions

Most of the consumer complaints about thermostats non working properly are usually because of connectivity bug.

Either 1 of the wires is broken, or the power is disrupted due to some reason.

Hence, if your Honeywell thermostat system is acting up, brand sure there are no breakages in the wiring, and the power is flowing.

Also, don’t forget to check the air handler doors/panels or the furnace cabinet doors. Honeywell systems come with a condom feature that turns on if either of the openings is not closed properly.

If this feature is turned on, the HVAC organization stops working.

Fixing blinking “Cool On” Calorie-free

If the ‘Cool On’ calorie-free is blinking, mostly information technology ways that the system is kickstarting and the safety timer has been tripped to foreclose the thermostat’s compressor from malfunctioning.

In this case, you lot don’t have to perform any troubleshooting. The safety feature turns off automatically after 5 minutes.

However, if information technology does not plow off automatically, here is what y’all can do:

  • Set the temperature setting to the lowest temperature bachelor. Also, ensure the fan is gear up to auto.
  • Ensure the thermostat timer is turned off and is not in setup style.
  • Bank check if the battery depression indicator is on.
  • Make sure all the furnace openings are shut.
  • Ensure the AC filter is not high-strung.
  • Check if the Air-conditioning coils are muddied.
  • Reset it either using the above-mentioned battery alter method or discover the factory reset option in the card. The latter will only work on smart thermostats.

Fixing blinking “Heat On” low-cal

If the ‘Estrus On’ light is blinking, it means that the prophylactic timer has been tripped to forestall the thermostat’s compressor from malfunctioning.

In this case, you lot don’t have to perform whatsoever troubleshooting. The rubber feature turns off automatically after five minutes.

Popular:   Honda CR-V Door Edge Guard

However, if it does not turn off automatically, hither is what you tin can exercise:

  • Set the temperature setting to the lowest temperature available. Besides, ensure the fan is set to machine.
  • Ensure the thermostat timer is turned off and is not in setup mode.
  • Check if the battery low indicator is on.
  • Make certain all the furnace openings are shut.
  • Reset it either using the above-mentioned battery alter method or find the factory reset option in the menu. The latter will merely piece of work on smart thermostats.

Troubleshooting Honeywell Thermostats doesn’t need to be a mystery

Honeywell thermostats are pretty easy to troubleshoot. Nevertheless, if you have checked the batteries, wiring, and furnace door simply accept not institute an issue notwithstanding, the thermostat either has a hardware issue, or you are not setting the temperature high enough or low enough.

To ensure the organisation’due south heating and cooling settings are on point, use the permanent hold method.

All y’all have to do is long hold the ‘Upwardly’ pointer (for heating) or ‘Downwards arrow’ (for cooling) and the button which says ‘Switch to Permanent Concur’.

This will manually change the thermostat setting to a higher or lower temperature than the outdoors.

If neither of the methods mentioned in a higher place piece of work, you might want to seek professional help.

You lot May Also Relish Reading

  • Honeywell Thermostat Absurd On Not Working: Easy Fix [2021]
  • Honeywell Thermostat Not Communicating: Troubleshooting Guide [2021]
  • Honeywell Thermostat Flashing “Return”: What Does It Mean?
  • The Effortless Guide to Honeywell Thermostat Battery Replacement
  • Honeywell Thermostat No Display With New Batteries: How To Prepare
  • Honeywell Thermostat Display Backlight Non Working: Like shooting fish in a barrel Fix [2021]
  • Honeywell Thermostat Wait Message: How to Ready Information technology?
  • Honeywell Thermostat Recovery Mode: How to Override

Ofttimes Asked Questions

Does the Honeywell thermostat have a reset button?

A Honeywell thermostat can either be reset past using the battery change method or by selecting the factory reset option from the settings.

What is the recovery mode on the Honeywell thermostat?

Recovery way is when the thermostat is working on achieving a temperature lower or college than the outdoor temperature.

How exercise I featherbed the recovery mode on a Honeywell thermostat?

You can bypass the recovery mode on a Honeywell thermostat by it in the settings. You can also schedule or program the recovery mode according to your preferences.