View the manual for the Honeywell RTH221B1021/A here, for free. This manual comes under the category thermostat and has been rated by 1 people with an average of a 7.5. This manual is available in the following languages: English. Do you have a question about the Honeywell RTH221B1021/A or do you need help? Ask your question here


The Honeywell RTH221B1021/A thermostats are LCD-displayed temperature controllers designed for home and office settings. They feature a compact and intuitive user interface that enables users to customize their heating and cooling schedules with ease. The thermostats do not come with remote control capability and do not have any memory function to retain the user's settings in the event of a power outage. These thermostats operate on a simple programming system that uses a five-two day schedule. This means that the user can program one set of heating and cooling temperatures for weekdays and another for weekends. With an accuracy of +/- one degree Celsius, the thermostats can reliably maintain a comfortable temperature setting throughout the day. The LCD display shows both the current room temperature and the user-set temperature. At a size of 10.67 centimeters in length and 8.38 centimeters in height, the thermostat is small enough to provide versatile mounting choices. Additionally, the thermostat is battery-operated, thus eliminating the need for complicated wiring that can require the services of an electrician. Despite its small size, the thermostat is engineered to provide durability and reliability over time, and its premium design ensures that it will blend in seamlessly with the surrounding decor.
| Brand | Honeywell |
| Model | RTH221B1021/A | RTH221B1021/A |
| Product | thermostats |
| EAN | 0085267312776, 0926801048730, 0852678669580 |
| Language | English |
| Filetype | User manual (PDF) |
| Memory function | No |
| Product color | White |
| Display | LCD |
| Handheld remote control | No |
Can't find the answer to your question in the manual? You may find the answer to your question in the FAQs about the Honeywell RTH221B1021/A below.
The best place for the thermostat is the room where you spend the most time, in many cases the living room or kitchen. Place the thermostat about one and a half metres above the floor, not in the sun and not on an outside wall.
If your thermostat has a dead band, your installation is, as it were, 'at rest'. The thermostat only switches on when, for example, the difference deviates more than 2˚C from the set room temperature.
Most people find that the ideal room temperature is between 19 and 22 degrees Celsius.
Press the "Up" or "Down" arrows on the thermostat to adjust the temperature to your desired level.
Check the batteries in your thermostat and make sure they are properly installed and not depleted.
Press the "Set" button, then use the arrows to navigate to the desired time slot and temperature. Repeat this process for each time slot you want to program.
Ensure that the thermostat is properly wired and connected to your heating or cooling system. Check if the circuit breaker is tripped or if there is a blown fuse that may be affecting the system's power supply.
Check if there are any drafts or open windows that may be affecting the temperature regulation. Additionally, ensure that the thermostat is located in an area where it can accurately sense the ambient temperature of the room.
No, the Honeywell RTH221B1021/A does not have a memory function. This means that it does not have the ability to remember and store user settings, so the user will need to manually adjust the settings every time they want to change the temperature.
The Honeywell RTH221B1021/A has an LCD display. This means that it has a digital screen that shows the current temperature and other settings in a clear and easy-to-read format.
No, the Honeywell RTH221B1021/A does not come with a remote control. This means that the user will need to manually operate the thermostat and make adjustments directly on the device.
Yes, the manual of the Honeywell RTH221B1021/A is available in English .
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Number of questions: 48Does this thermostat internally open and close a physical contact? I am replacing an old thermostat like the one in the photo.
This message has been automatically translatedMy thermostat has a blank screen. No menu button. I’ve changed the batteries. How do I reset this model please?
1 comment
To reset the Honeywell RTH221B1021/A thermostat, follow these steps: 1. Press and hold the "s" and "t" buttons simultaneously for three seconds until the display appears. 2. Use the "s" or "t" buttons to navigate to the desired function number or option number. 3. Press the "s" or "t" button to change the option. 4. Press the "s" and "t" buttons simultaneously for one second to advance to the next function. 5. When the last function is displayed, press the "s" and "t" buttons to save any changes and exit the menu.
This answer is automatically generatedHow do I bypass all the settings and just turn it on to Heat or Cool when I want it to work?
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To activate the thermostat for heating or cooling without considering any settings, please follow these steps: 1. Adjust the jumper JP1 located on the back of the thermostat. If you have connected a wire to the G terminal, leave the jumper in the factory-set position (HG) if you have a gas or oil furnace. If you have an electric furnace, move the jumper to the HE position. 2. Switch off the power to the heating/cooling system.
This answer is automatically generatedI have the same question.
How do I bypass all the settings and just turn it on to heat or cool when I want it to work?
bought home has the rth221b1021 thermostat but I don't know how to program it not wanting to do the down loads on this computer is there anyway I can get instructions on how to program it.
I am having a very tough time setting up thermostat . All i seem to be getting is the fan running . The pipe coming from the compressor is all icy . Is the problem with the thermostat or something else ?
Which terminal on the thermostat is the neutral (W or B) and which is the aux, heat (B or W)?
How to cut off the thermostat. How to reset if time is not lnown, I do not know how to operate the thermostat.
I need to reset the schedule on the thermostat. Our landlord had set it prior to our move in, and we cannot figure out how to reset it, so there is no schedule.
So we have the thermosat programmed for the day. Somethibg happened and the program is not going as request set up. How can we clear it out to no program and reset to a new program please. Thank you