This guide is for Honeywell Home T6R-HW owners whose heating doesn’t come on. The checks follow the “Heating system does not respond” section of the T6/T6R user guide from Resideo, which makes Honeywell Home products.

What This Problem Means

Resideo’s checks run from the thermostat setting to the power supply and the receiver box, which is wired to the boiler. The checks here stop at the thermostat, its alerts and the receiver box light; anything past them is for your installer or a heating engineer.

Common Symptoms

• The heating doesn’t come on
• The boiler doesn’t fire when the thermostat should be calling for heat
• A receiver or boiler alert on the thermostat
• A blank thermostat screen

Safe Checks You Can Try

1. Set the temperature above the room temperature

Resideo’s user guide says to make sure the set temperature is higher than the actual temperature.

2. Check the circuit breaker

Check the circuit breaker and reset it if necessary. If the thermostat screen is blank, Resideo also says to make sure the power is switched on.

3. Check the heating system is powered on

Resideo’s guide says to check the heating system is powered on.

4. Check the receiver box light

Check the receiver box is working: Resideo’s installation guide says its green LED is on after powering up both devices. Resideo says the receiver box must be installed by a competent person with the mains power switched off, so never open it or touch its wiring.

5. Look for an alert on the thermostat

Check the thermostat screen for a receiver or boiler alert, and follow the guide for it: receiver not communicating, rebinding the receiver or boiler fault alerts.

6. Call your installer for anything past this

Resideo’s installation guide gives the installer a test at the receiver box: pushing one of its buttons to check the valves are switching. If the heating still won’t come on, contact your installer or a heating engineer. Don’t open the boiler or touch any wiring. Any work on the boiler itself must be done by a Gas Safe registered engineer.

These checks come from Resideo’s T6/T6R user guide and Resideo’s T6R installation guide. Resideo says the receiver box must be installed by a competent person with the mains power switched off.

When To Contact Support

If none of these steps fix it, contact Resideo, which makes Honeywell Home products, through Resideo’s UK site.