Honeywell Home DT4R Black Room Thermostat Spare | DTS42BRFST22 Wireless

The Honeywell Home DT4R Black Room Thermostat DTS42BRFST22 is a spare wireless thermostat head for replacing failed DT4R units or expanding existing systems. Modern slim design with large energy-efficient LED display and full backwards/forwards compatibility across Honeywell RF ecosystem including evohome and HCC100.

Key Features

• Spare thermostat only - requires existing compatible receiver (DT4R, evohome, HCC100).
• Ramses II & III RF protocol ensures seamless integration with all Honeywell RF products.
• Built-in eco-mode provides timed temperature offset for energy savings.
• Energy-efficient LED display auto-off technology with wake-up button.
• Backlit captive touch buttons for intuitive operation in all lighting.
• Fuzzy Logic control optimises boiler operation for precise temperature maintenance.

Why Choose DT4R Black Spare Thermostat?

Cost-effective replacement for failed thermostat heads maintaining full system functionality without complete kit replacement.

Perfect match for black DT4R installations or system expansion with consistent styling and performance.

Suitable For

• DT4R system replacements (thermostat head failure).
• Evohome and HCC100 expansions requiring additional thermostats.
• Existing Honeywell RF installations needing spare parts stock.

Technical Specifications

• Brand: Honeywell Home by Resideo
• Model: DT4R Black Spare Thermostat Head
• MPN: DTS42BRFST22
• GTIN: 5059085002695
• Power Supply: 2 x AA batteries
• Battery Life: Approx. 3.5 years
• Set Point Range: 5 °C to 35 °C
• Display Range: 0 °C to 40 °C
• Sensor: 10k NTC thermistor @ 25 °C
• RF Frequency: ISM 868.0-868.6 MHz (Ramses II/III)
• Range: 30 m residential
• ErP Class: Class V (+3 %)
• Dimensions: 101 x 101 x 54 mm (WxHxD)
• Weight: 130 g
• Warranty: 2 years

Compatibility & Installation

Direct replacement for DT4R black thermostats or spare for evohome/HCC100 systems. Simple battery installation and automatic binding to existing receivers. Supports heat pumps, zoning, underfloor heating, and 24-230V on/off appliances.