Key Features:

• Wireless programmer and thermostats — flexible heating control without extra wiring
• Energy-saving TPI control — maintains comfort while reducing wasted energy
• Two-way wireless communication — ensures reliable, responsive system performance
• Signal strength indicator — helps position devices for optimal wireless connection
• Built-in Economy and Comfort programmes — simple scheduling to suit daily routines
• Industry standard backplate fit — easy upgrade from ST9400 and ST6400 models
• 1 year guarantee

What's Included:

• ST9420C (wireless-enabled programmer)
• DT92E (wireless room thermostat)
• CS92A (wireless cylinder thermostat)

The Honeywell Home Sundial RF² Pack 3 Wireless Thermostat System offers a versatile and reliable way to manage your heating. Combining a wireless programmer, room thermostat, and cylinder thermostat, it provides flexible control without the need for additional wiring. Designed for both homeowners and installers, it features energy-saving TPI control, intuitive programming, and dependable wireless communication. Ideal for upgrades, it fits industry-standard backplates and replaces older models with ease. Upgrade your heating control today with Honeywell Home.

Wireless Heating Control

This fully wireless system includes a programmer, room thermostat and cylinder thermostat, allowing flexible placement around your home without disruptive wiring.

Energy-Saving TPI Technology

Time Proportional Integral control helps maintain a consistent temperature by reducing temperature swings, improving comfort and energy efficiency.

Two-Way Wireless Communication

Devices communicate continuously with each other, ensuring commands are received accurately and heating responds quickly to changes.

Built-In Economy and Comfort Programmes

Pre-set programmes make it easy to balance comfort and efficiency, with simple options to suit different household routines.

Wireless Signal Strength Indicator

A built-in wireless signal strength indicator helps you find the best position for each device, ensuring reliable communication between components and optimal system performance.

Clear LoT Text-Based Display

The programmer features a LoT (Line of Text) display, providing clear, step-by-step, text-based guidance during setup and everyday operation for simple, confident control.

Flexible Wireless Installation

With wireless, battery-powered components, the system allows flexible placement throughout the home without the need for additional wiring, making installation easier and ideal for upgrades or retrofits.

Installer-Friendly Upgrade

Designed to fit an industry-standard backplate, the ST9420C programmer is a direct replacement for ST9400 and ST6400 models, making upgrades quick and straightforward.