KING K901-W
KING K901-W Hoot WiFi Line Voltage Smart Programmable Thermostat User Manual
Model: K901-W | Brand: KING
Introduction
This user manual provides comprehensive instructions for the installation, operation, and maintenance of your KING K901-W Hoot WiFi Line Voltage Smart Programmable Thermostat. Designed for electric heating systems, this thermostat offers precise temperature control and convenient remote management via the Hoot smartphone application. Please read this manual thoroughly before installation and use to ensure safe and optimal performance.
Safety Information
WARNING: Risk of electrical shock. Installation must be performed by a qualified electrician in accordance with all local and national electrical codes. Disconnect power at the circuit breaker before installing or servicing the thermostat.
- Ensure the power supply is completely off before beginning any wiring.
- Verify voltage compatibility (120/208/240V) with your heating system.
- Do not operate the thermostat with wet hands or while standing in water.
- Keep children away from electrical components.
- This thermostat is designed for use with baseboard, fan forced, and radiant electric heaters only.
Product Features
- Single Pole Line Voltage 3-Wire Installation
- Programmable via Hoot Smart Phone App
- Large LCD Touchscreen Display
- Multi-Volt Rated: 120V, 208V, 240V
- Over-The-Air (OTA) Firmware Upgradeable
- Temperature Range: 41°F - 90°F (5°C - 32°C)
- User Defined Max Temperature Lock
- Program 4 or 6 Time Periods Per Day for Maximum Flexibility
- Electronic Sensing with Thermistor for Accurate Temperature Control (±1°F)
- Compatible with Baseboard, Fan Forced & Radiant Electric Heaters
Setup and Installation
1. Wiring Installation
Before starting, ensure power is OFF at the circuit breaker. The K901-W thermostat is designed for single pole, 3-wire line voltage installations. Connect the wires according to the diagram provided in the packaging. Ensure all connections are secure and insulated. This thermostat is compatible with 120V, 208V, and 240V systems.

Figure 1: KING K901-W Thermostat. This image displays the sleek, white design of the thermostat with its large, clear LCD touchscreen, indicating time, current temperature, and set temperature.
2. Wi-Fi Connection
The Hoot thermostat requires a 2.4GHz Wi-Fi network for connectivity. Follow these steps to connect your thermostat to your home network:
- Power on the thermostat after wiring is complete.
- Access the Wi-Fi setup menu on the thermostat's touchscreen.
- Select your 2.4GHz Wi-Fi network from the list.
- Enter your Wi-Fi password using the on-screen keyboard.
- Confirm the connection. A successful connection will be indicated on the thermostat display.
3. Hoot App Download and Setup
Download the "Hoot" app from your smartphone's app store (iOS or Android). Create an account and follow the in-app instructions to add your K901-W thermostat. This will allow you to control and program your thermostat remotely.

Figure 2: Hoot Smartphone Application. This image shows the user interface of the Hoot app on a smartphone, with clear temperature display and various control buttons for settings, programming, and vacation mode.
Operating Instructions
Touchscreen Operation
The K901-W features a responsive touchscreen for direct control. Use the up/down arrows to adjust the set temperature. The power icon turns the heating system on or off. The hand icon allows for temporary hold of the temperature setting.
App Control and Programming
The Hoot app provides advanced control and programming capabilities:
- Scheduling: Program up to 4 or 6 time periods per day to automatically adjust temperature settings based on your schedule.
- Remote Adjustment: Change temperature settings from anywhere using your smartphone.
- Vacation Mode: Set a specific temperature for extended periods when you are away to save energy.
- Temperature Lock: Define a maximum temperature limit to prevent overheating or unauthorized adjustments.
- Boost Function: Temporarily increase heating for a quick warm-up.
Maintenance
The KING K901-W thermostat requires minimal maintenance. Keep the touchscreen clean with a soft, dry cloth. Avoid using abrasive cleaners or solvents. The thermostat supports Over-The-Air (OTA) firmware upgrades, ensuring your device always has the latest features and improvements. The Hoot app will notify you when an update is available.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat not powering on. | No power from circuit breaker; incorrect wiring. | Check circuit breaker. Verify wiring connections are secure and correct. Consult a qualified electrician if unsure. |
| Cannot connect to Wi-Fi. | Incorrect Wi-Fi password; not a 2.4GHz network; weak signal. | Ensure correct password. Confirm your network is 2.4GHz. Move thermostat closer to router or use a Wi-Fi extender. |
| Thermostat screen unresponsive. | Temporary software glitch. | Turn off power to the thermostat at the circuit breaker for 30 seconds, then restore power. |
| Heating system not responding. | Incorrect wiring; thermostat in OFF mode; system malfunction. | Check thermostat mode (ON/OFF). Verify wiring. If problem persists, consult an HVAC professional. |
Specifications
| Attribute | Detail |
|---|---|
| Brand | KING |
| Model Number | K901-W |
| Voltage | 120V / 208V / 240V |
| Wattage | 3840 watts (max) |
| Controller Type | Touchscreen, Smartphone App |
| Connectivity Technology | Wi-Fi (2.4GHz) |
| Temperature Range | 41°F - 90°F (5°C - 32°C) |
| Control Method | App, Touch |
| Mounting Type | Wall Mount |
| Item Weight | 10.2 ounces |
| Dimensions | 7.09 x 3.19 x 2.99 inches (Package) |
| UPC | 093319335093 |
Warranty Information
Specific warranty details for the KING K901-W thermostat are provided by the manufacturer. Please refer to the warranty card included with your product or visit the official KING Electric website for the most current warranty terms and conditions.
Customer Support
For technical assistance, troubleshooting beyond this manual, or general inquiries, please contact KING Electric customer support. Contact information can typically be found on the manufacturer's website or on the product packaging.
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