Honeywell Home DT4R

The Honeywell Home DT4R is a wireless non-programmable room thermostat. The YT42WRFT20 reference combines a white room unit with an On/Off receiver.

Model Identification

Brand: Honeywell Home
Company: Resideo
Series: DT4
Model: DT4R
Reference ordering code: YT42WRFT20
Specification scope: EMEA On/Off reference kit; white

Room Thermostat Specifications

Room-unit power2 × AA alkaline batteries

Room-to-receiver linkRF, 868.0–868.6 MHz

Temperature setting range5–35°C (technical data table)

Control methodFuzzy Logic

DisplayLED segment display

OperationLocal temperature control with eco/boost offset

ApplicationCompatible heating and cooling systems

Manufacturer communication range30 m in a residential building environment; actual range varies

Receiver Specifications

Power supply230V AC mains

Relay switching capacity5A resistive / 3A inductive

Equipment controlOn/Off relay for this YT42 reference

Protection classIP30

Specification scope: The YT42 kit is the On/Off configuration. YT43M modulating kits and DTS42 spare room units are distinct references; their features are not assigned to YT42WRFT20.

Compatibility and Installation

The RF room unit needs its compatible receiver, which still connects by cable to the controlled equipment. Match the receiver output and rating to the appliance or zone controller. Follow the exact thermostat and equipment manuals; electrical installation should be performed by a qualified installer.

Wireless Thermostats · Honeywell Home manufacturer · Honeywell Home DT4 · Honeywell Home DT4M

Official Resources

Reference data checked against Resideo model-specific catalog information and official documentation on 11 October 2026.

Official DT4R reference product page
Official DT4 specification sheet
Official DT4 family overview

AirAlign is an independent informational resource and is not affiliated with Honeywell Home or Resideo.