On a Honeywell thermostat, pull the thermostat away from the wall, then look for the model number sticker on the back of the thermostat.
There are three types of old Honeywell thermostats: mechanical, digital non-programmable and digital programmable.
Yes, this thermostat is very standard and can be changed with just about any new thermostat on the market. That said, you say this one is not working? Can you put it back on the wall and switch the fan from auto to on?
Control your thermostat from anywhere using the Honeywell Home app, or with other smart home technology like Apple HomeKit*, Amazon Alexa, Google Home or IFTTT. Apple HomeKit is a common language that smart devices can understand, support and control via Siri®, the Apple voice assistant.
Look at Voltage Requirements
Most homes use either low-voltage systems or high-voltage systems. Low voltage systems are the most common for residential HVAC units. If your system is powered by low voltage (usually 24V), you'll need a thermostat that works with low voltage systems.
If your thermostat is registering incorrect temperatures, then it may be time for a replacement. You can test your thermostat's reading by using a portable indoor thermometer to verify the temperature is correct. The sensor in your thermostat can malfunction from old age, misuse, or manufacturing defect.
The average lifespan of a Honeywell thermostat is typically around 10-20 years, depending on various factors such as usage, maintenance, and environmental conditions. With proper care and regular servicing, a Honeywell thermostat can last even longer.
It's important to identify which heating/air system you have in your home to make sure your new thermostat will be compatible. The most common type is the central heating and AC system, but people also use heat pumps, electric baseboards, and furnaces.
If it's a round Honeywell thermostat there's not much to know. It's not programmable. You simply rotate the dial needle to the desired temperature and walk away.
The most common configuration is five wires. However, you could see as few as two and many as ten. Make a note of any present wire not connected to a terminal. Do not label these wires.
In 1906 the Honeywell company introduced homeowners to the very first thermostat; a significant moment in the history of thermostats.
Honeywell (and others such as Trane) use a C wire on models that use WiFi or voice recognition or Z-wave so they can have a 24V connection. All thermostats use low voltage from the other connectors and typically use the batteries as a backup when there's no C wire.
If a Honeywell thermostat is accidentally locked by an owner, guest, or personnel and the unlock code for the device is unknown, you can use the default unlock code which is "1234".
For most thermostats, the Model Number is located on the back of the detachable face plate. You can also find this on your product packaging, as well as included literature. If you're registering a warranty or rebate for a WiFi product, use the MAC ID as your Serial Number.
To further help, many Honeywell Home T-Series thermostats are mounted on a Universal Wall Plate that allows you to change models by simply 'popping' one in place of the other.
A bad thermostat can be detected when your AC or furnace is not turning on, your HVAC systems are not turning off, the thermostat not responding, your HVAC system is short-cycling, the room temperature not matching the temperature displayed on the thermostat, and the programmed setting resetting themselves.
Before installing a new thermostat, you must check your home's compatibility. Houses are wired in two ways, line voltage, and low voltage, and you'll want to buy a thermostat that will operate with your particular heating and cooling system. Therefore, choosing the right digital thermostats is important.
If your thermostat has fresh batteries but suddenly lacks power, flashes, or isn't responsive to adjustments, it may need replacement. If resetting the thermostat doesn't resolve the problem, you may have wiring problems or faulty components causing your thermostat to not turn on.
Start by looking in your owner's manual or any other paperwork that came with your product. If you don't happen to have them handy, you'll also find the model number printed right on the unit.
They're the same! In fact, the "Residential" vs. "Commercial" wording is nothing more than a cosmetic difference. If you are buying the product for use in a home, but you like the name "Resideo" more than "Honeywell Home", then feel free to get the Resideo variant.
If the thermostat is showing offline, try resetting your WiFi router. Make sure the network is a standard home network and does not require logging in from a web page, such as a guest network or business network. This specifically speaks to “Dual Band” routers which support both 2.4 GHz and 5 GHz networks.
If you have a manual thermostat, setting the temperature on your Honeywell thermostat is simple. All you need to do is to press the up and down buttons to set the temperature. The temperature you set will stay until you change the temperature again.