Installation in 3 steps


Before installation

  • Check that the thermostat is compatible with your boiler. Refer to the boiler manufacturer’s instructions.
  • The wireless thermostat can be located almost anywhere you wish; see diagrams for guidance on the ideal location. As it requires no wires it makes the installation very simple.
  • Before installing the Boiler Relay, ensure the mains power to the boiler is switched off.

During installation

You will need the following:

  • Cross-head screwdriver
  • Small flat blade screwdriver
  • Pliers
  • Wire-strippers

After installation

  • Dispose of any old electronic equipment at an authorized recycling center.

Step 1 : Install the Thermostat and Boiler Relay

  1. If necessary, disconnect and remove the old equipment.
  2. Separate the thermostat from the mounting plate.
  3. Attach the mounting plate to the wall.
  4. Reattach the thermostat to the mounting plate

    Step 1 b : Install the Thermostat and Boiler Relay
  5. Remove the wiring plate from the Boiler Relay.
  6. Mount the wiring plate to the wall.

    Mount on a plastic wallbox or directly on the wall next to the boiler. For best RF performance keep a distance of at least 30cm from the boiler, other metal objects or mains cables.
  7. Wiring the Boiler Relay
    Refer to the boiler installation guide for instructions on wiring the Boiler Relay to the correct terminals in the boiler.
  8. Attach the Boiler Relay to the wiring plate.

    Locate hinges, rotate the cover downwards and click into place.

Step 2 : Install the Internet Gateway RFG100

  1. Connect the Gateway to a mains power source.

    During power up the 3 LEDs will light up red.
    The power  and RF communication  LEDs should then change to green – indicating that the Gateway is powered and successfully connected to the Thermostat.
  2. Connect the Gateway to an internet router with the provided Ethernet cable.

    The connectivity  LED should begin to flash green – indicating that the Gateway has successfully connected to the internet (but not yet registered)

Step 3 : Get Connected

  1. Create an account online.
    Visit the website below and follow the steps to create an account.
  2. Name your location.
    After creating an account and receiving the activation confirmation e-mail, choose a suitable name for the location of the thermostat (e.g. My Home).
  3. Register the Internet Gateway.
    Enter the MAC and CRC codes of your Internet Gateway

    The MAC and CRC codes are on the information label on the bottom of the Gateway

    The green LED will stop flashing when the Internet Gateway has been successfully registered.
  4. Download the Smartphone App
    Download the “Total Connect Comfort International” App for your Smartphone or Tablet.

  5. Use the app
    Log in to the App and start controlling your heating remotely, or setting up a heating schedule for each day of the week.

Error Messages

Loss of RF communication with the GatewayCycle the power to the Gateway and verify that it is located within the RF communication limits of the thermostat.
Loss of RF communication with the ThermostatCheck the RF thermostat is powered and is within RF range.
No internet connectionCheck the router has access to the internet.
Connecting to the routerIf the LED stays orange, check the cables and power supply to the router.
Gateway not yet registeredCreate an account and register the Internet Gateway on:
Note : RF communication can be affected by obstacles, metal objects or excessive distance between the RF devices. It may be necessary to reposition devices for better performance if the RF communication seems unreliable.

For support:
200 Berkshire Place
Winnersh Triangle, Berkshire
RG41 5R
Phone: 0300 130 1299

 Pittway Sarl, Z.A. La Pièce 4, 1180 Rolle, Switzerland
Country of origin : UK

© 2020 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell International Inc.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.

Documents / Resources

Honeywell Y87RFC Connected Single Zone Thermostat [pdf] User Guide
Y87RFC, Connected Single Zone Thermostat
Honeywell Y87RFC Connected Single Zone Thermostat [pdf] User Guide
Y87RFC, Connected Single Zone Thermostat


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