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Thermostat

YS4003

Product Support

Documentation

Frequently-Asked Questions

Q: Is the YoLink Thermostat easy to install?

A: Yes, the YoLink Thermostat is designed to be user-friendly and easy to install for most users. The installation process typically involves removing your old thermostat, labeling the wires, connecting the wires to the new thermostat, and following the setup instructions provided in the user manual.


Q: Does the YoLink Thermostat require a C wire?

A: Yes, the YoLink Thermostat does require a C wire (also known as a "common" wire) for proper installation and functionality. The C wire is essential for providing continuous power to the thermostat.


Q: Does the YoLink Thermostat support 2-stage heating and cooling systems?

A: No, the YoLink Thermostat does not support 2-stage heating and cooling systems.


Q: Can I use the YoLink Thermostat with my current HVAC system?

A: The YoLink Thermostat is compatible with most 24V HVAC systems, including gas, electric, and heat pump systems. However, it's essential to verify compatibility with your specific system before installation.


Q: Can I integrate the YoLink Thermostat with my smart home system?

A: The YoLink Thermostat is designed to work with a variety of smart home systems and platforms, such as Amazon Alexa and Google Assistant. However, to fully integrate the thermostat with these systems, a YoLink Hub is required. The YoLink Hub serves as a central communication point between your smart home devices, enabling seamless integration and control.


Q: Why doesn't YoLink Thermostat support 2-stage thermostats?

A: YoLink Thermostat is designed to be a simple, cost-effective, and user-friendly device. It is primarily intended for use with single-stage heating and cooling systems, which are more common in residential settings. As a result, it does not have the advanced features required to support multi-stage systems like 2-stage thermostats.


Q: Will YoLink Thermostat receive an update to support 2-stage thermostats in the future?

A: As of now, there are no official announcements regarding plans to update the YoLink Thermostat to support 2-stage systems. We recommend staying up-to-date with YoLink's product releases and announcements to be informed of any future changes or new product offerings.

If you have any further questions or need assistance, feel free to contact YoLink's customer support for more information.


Q: Can YoLink Thermostat function as a stand-alone unit without a hub?

A: Yes, the YoLink Thermostat can work as a stand-alone unit. Without the YoLink Hub, customers can still use it as a regular thermostat to manually control their heating and cooling systems. However, the smart features and remote access through the app will not be available.


Q: What features are available when using YoLink Thermostat as a stand-alone unit?

A: When used as a stand-alone unit, the YoLink Thermostat functions like a traditional thermostat, allowing you to manually adjust temperature settings, set schedules, and control your heating and cooling systems. However, you won't have access to remote control, smart home integration, or other advanced features available through the YoLink app.


Q: What is the purpose of the HP/GAS slide switch on the YoLink Thermostat?

A: The HP/GAS slide switch is used to set the thermostat for heat pump systems (HP) or gas systems (GAS). Set the switch to HP for heat pump systems, otherwise set it to GAS.


Q: How do I set the O/B slide switch on the YoLink Thermostat?

A: If you set the HP/GAS switch to HP, set the O/B slide switch to O for energizing the reversing valve on cooling (hot climates) or B for energizing the reversing valve on heating (cold climates) operation. If you set the HP/GAS switch to GAS, the valve will only energize for heating.


Q: What is the warranty period for the YoLink Thermostat?

A: YoSmart offers a 1-year warranty for the YoLink Thermostat from the date of purchase. The warranty covers any defects in materials and workmanship for the YoLink Thermostat. If you experience any issues with your thermostat within the warranty period, contact YoSmart customer service for support or possible replacement, in accordance with their warranty terms and conditions. The warranty generally covers defects in materials and workmanship. It may not cover accidental damage, improper installation, or issues caused by misuse. Please refer to the warranty terms and conditions provided by YoSmart for more information.


Q: What should I do if my YoLink Thermostat malfunctions after the warranty period?

A: If your thermostat malfunctions after the warranty period, you can still contact YoSmart customer service for assistance. They may be able to provide guidance on troubleshooting, repairs, or recommend a suitable replacement.


Q: Does the YoLink Thermostat support YoLink Control-Device to Device Tech?

A: No, the YoLink Thermostat does not support YoLink Control-Device to Device Tech.


Q: How can I configure the minimum running time for my YoLink Thermostat?

A: To set the minimum running time, make sure your app and device firmware are updated to the latest versions, then go to the details settings to set the minimum running time from 1 to 60 minutes.


Q: My YoLink Thermostat mounting plate is damaged. What should I do?

A: In case of a damaged mounting plate, please get in touch with YoLink Customer Support for assistance.


Q: What if I don't have a C wire for my YoLink Thermostat?

A: If you don't have a C wire, you'll need to add a 24 VAC power adapter and apply 24VAC to the R and C terminals.


Q: Can I use the YoLink Thermostat to control a humidifier?

A: Unfortunately, the YoLink Thermostat does not provide any terminal for humidifier control.


Q: Is there a battery-powered version of the YoLink Thermostat?

A: No, there is no battery-powered version of the YoLink Thermostat.


Q: Can I use Alexa or Google with my YoLink Thermostat for voice control?

A: Yes, the YoLink Thermostat is compatible with Alexa. You can use voice commands to switch between modes (Auto, Cool, Heat, Off) and to request information about the device's running mode, Cooling Point, and Heating Point.


Q: How do I connect the R and RC wires to the YoLink Thermostat?

A: The YoLink Thermostat does not have an RC slot. Connect both R and RC wires to the R slot of the YoLink Thermostat, as they are the same wire in your HVAC system.


Q: What should I do if the YoLink thermostat does not stay attached to the wall plate during installation?

A: If you are experiencing issues with the YoLink thermostat not staying attached to the wall plate, ensure that you heard a click sound when you initially pushed the thermostat onto the plate. If you heard the sound but still face issues with the thermostat detaching from the wall when using the physical buttons, please contact YoLink customer support for further assistance.


Q: How do I use the YoLink YS4003 thermostat to control a 2-wire heating or cooling system?

A: To control a 2-wire heating or cooling system with the YoLink YS4003 thermostat, follow these steps:

For a 2-wire heating system:

a. Set the Hp/Gas switch to the Gas position.

b. Ensure you have a 24VAC power supply. Connect one wire from the power supply to the C terminal and the other wire to the R terminal.

c. Connect one wire from your existing 2-wire heating system to the R terminal (along with the 24VAC wire) and the other wire to the W terminal.

For a 2-wire cooling system:

a. Set the Hp/Gas switch to the Gas position.

b. Ensure you have a 24VAC power supply. Connect one wire from the power supply to the C terminal and the other wire to the R terminal.

c. Connect one wire from your existing 2-wire cooling system to the R terminal (along with the 24VAC wire) and the other wire to the Y terminal.

Q: My YoLink thermostat is stuck in a power-on loop, the display keeps blinking, and I can't make any selections or factory reset. What should I do?

A: If your YoLink thermostat is stuck in a power-on loop with a blinking display, try connecting only the R and C terminals to check if the thermostat continues to blink. If the issue persists, contact YoLink customer support for further assistance.

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For product or technical support, please email us at service@yosmart.com or call us at 831-292-4831. Please note our Irvine, California office hours: 9AM - 5PM Pacific, Monday through Friday, for US phone support.  

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