Honeywell TH401 Non-programmable Thermostat Owner's Manual
About Your New Thermostat
This thermostat is designed to control electric heating systems, including baseboard heaters, radiant floors, radiant ceilings, convectors, and fan-forced heaters.
The thermostat CANNOT be used with:
- Resistive loads under 0.83 A
- Resistive loads over 10.4 A
- Systems driven by a contactor or relay (inductive loads)
- Central heating systems
Supplied Parts
- One (1) thermostat
- Two (2) 6-32 mounting screws
- Two (2) solderless connectors
Temperature Display and Setting
The thermostat normally displays the current ambient temperature.
To view the setpoint temperature, briefly press the Up or Down button. The setpoint will be displayed for 5 seconds, and the screen will illuminate for 12 seconds.
To change the setpoint temperature, press the Up or Down button until the desired value is displayed.
The display may show a 'Fan' indicator if the thermostat is configured for fan-forced heater control with 5-minute cycles.
A heating intensity indicator may appear when heating is active. No indicator appears when heating is off.
Visual Description: Image of the Honeywell TH401 thermostat display showing '21.0' and a 'Fan' indicator, with labels pointing to the 'Up button' and 'Down button'.
Removing the Faceplate
Safety First: TURN OFF POWER OF THE HEATING SYSTEM AT THE MAIN POWER PANEL TO AVOID ELECTRIC SHOCK.
Loosen the screw holding the faceplate to the base. This screw is captive and cannot be removed completely. Remove the faceplate from the base by pulling the bottom half away.
Visual Description: Diagram illustrating the removal of the thermostat faceplate. It shows a screw being loosened and the faceplate being pulled away from the base.
Wiring
Connect one thermostat wire to the heater (load) wire and the other to the power supply wire using the provided solderless connectors for copper wires. The thermostat wires are non-polarized, meaning either wire can connect to the load or the power supply.
Visual Description: Diagrams illustrating thermostat wiring. One shows a '2-wire installation' with two wires connected to the thermostat base. Another shows a '4-wire installation' with four wires connected.
Note: All cables and connections must conform to local electrical codes. Use special CO/ALR solderless connectors when connecting with aluminum conductors.
Installing the Faceplate
Install the base onto an electrical box.
Reinstall the faceplate onto the base and secure it in place with the screw.
Note: Keep the air vents of the thermostat clean and unobstructed at all times.
Visual Description: Diagram showing the installation of the thermostat faceplate. It depicts the base being attached to an electrical box and the faceplate being secured with a screw.
Setup Procedure
The setup menu allows you to configure the thermostat's settings. The following steps guide you through the process:
- Press the Up and Down buttons simultaneously for three seconds to enter the setup menu.
- Press the Up or Down button to change the current option.
- Press the Up and Down buttons simultaneously for one second to advance to the next parameter.
- When the last parameter is displayed, press the Up and Down buttons for three seconds to save any changes and exit the menu.
Note: If no button is pressed for one minute, the thermostat will automatically save any changes made and return to its normal display.
Table 1: Setup Menu
| Parameter | Options | Display and Default Setting |
|---|---|---|
| Temperature display format | °C / °F | °C (Default) |
| Cycle length | Fan: 5 minutes / Fan-forced heater Std: 15 seconds / Baseboard heater | FA (Default for Fan-forced) / Default for Std |
| Minimum setpoint | 5°C - 20°C (41°F - 68°F) | 5°C (Default) |
| Maximum setpoint | 15°C - 30°C (59°F - 86°F) | 30°C (Default) |
In Case of Difficulty
Table 2: Troubleshooting
| Problem | Solutions |
|---|---|
| Thermostat is hot. | This is normal. However, check if:
|
| Displayed temperature is wrong. | Remediate if any of the following conditions exist:
|
| Display disappears and reappears after a few minutes. | The thermal protection device on the heater has temporarily opened. This can happen if the heater is obstructed by furniture or curtains, causing it to overheat, or if the heater's thermal protection device is too sensitive. |
Specifications
- Supply: 120/240 VAC, 60 Hz
- Minimum load: 0.83 A (resistive only), 200 W @ 240 VAC, 100 W @ 120 VAC
- Maximum load: 10.4 A (resistive only), 2500 W @ 240 VAC, 1250 W @ 120 VAC
- Display range: 0°C to 50°C (32°F to 122°F)
- Setpoint range: 5°C to 30°C (41°F to 86°F)
- Storage: -20°C to 50°C (-4°F to 120°F)
- Heating cycle length: 15 seconds / 5 minutes (user-selectable)
- Permanent memory: Settings are retained after a power outage.
3-Year Limited Warranty
Resideo warrants this product (excluding battery) against defects in workmanship or materials for three (3) years from the date of original purchase, under normal use and service.
If the product is found to be defective during the warranty period, Resideo will repair or replace it at their option.
If the product is defective:
- Return it with a dated proof of purchase to the place of purchase; OR
- Call Resideo Customer Care at 1-800-468-1502. They will advise if the product should be returned to: Resideo Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr. N., Golden Valley, MN 55422, or if a replacement can be sent.
This warranty does not cover removal or reinstallation costs. It does not apply if the defect resulted from damage incurred while the product was in the consumer's possession.
Resideo's sole responsibility is to repair or replace the product as stated. Resideo is not liable for any incidental or consequential damages resulting from any breach of warranty or product failure.
Some states may not allow limitations on incidental or consequential damages, so this limitation might not apply to you.
This is the only express warranty Resideo makes. Implied warranties, including merchantability and fitness for a particular purpose, are limited to the three-year duration of this warranty. Some states do not allow limitations on how long an implied warranty lasts.
This warranty grants specific legal rights, and you may have other rights that vary by state. For questions, contact Resideo Customer Care at 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.
Documents / Resources
For more information, refer to the original Owner's Manual PDF:
Visual Description: Image of the Honeywell TH401 Non-programmable Thermostat Owner's Manual cover, also showing French and Spanish titles.
