Honeywell T4 T4R T4M Thermostat User Manual

Honeywell Lyric T4, T4R & T4M Thermostat User Manual

Honeywell T4, T4R & T4M Table of Contents

Thermostat Interface

  • Status Icons
  • Menu & Navigation Icons
  • Navigating the menu


  • Heating Schedule
  • Clock
  • Date
  • Keypad lock
  • Optimisation
  • OpenTherm® boiler alerts (T4M only)

Standby mode
Away mode
Schedule Override

  • Temporary Override
  • Timed Override
  • Turn Schedule Off

Changing the Batteries (T4 & T4R only)
Wireless Receiver Box (T4R only)

Honeywell Lyric T4, T4R & T4M Heating schedule

Your Thermostat comes with the following default schedule.
Follow the next steps to adjust the programmed schedule


Days 1 to 5 (Mon to Fri)

Days 6 & 7 (Sat & Sun)







6:30 - 8:00

19 °C

8:00 - 10:00

19 °C


8:00 - 18:00

16 °C

10:00 - 17:00

16 °C


18:00 - 22:30

21 °C

17:00 - 23:00

21 °C


22:30 - 6:30

16 °C

23:00 - 8:00

16 °C

Honeywell T4, T4R & T4M Troubleshooting

If you have difficulty with your Thermostat, try these suggestions. Most problems can be corrected quickly and easily.

All models

Screen is blank

Replace the batteries (T4 & T4R only).

Check the OpenTherm boiler has power (T4M only). Contact installer.

Thermostat shows

Batteries have less than 10% power and need to be replaced soon.

Thermostat is flashing  +

Batteries are critically low and need to be replaced immediately - see ‘Changing the Batteries’.

Thermostat shows  but the boiler does not switch on.

The boiler cycles on and off as it controls the temperature, and sometimes the  icon will be displayed when the boiler has cycled off.

If the boiler doesn’t switch on after a long period of time contact your installer

Heating system does not respond to temperature adjustments.

Make sure the set temperature is higher than the actual room temperature.

Check the heating system is powered on.

Check the Receiver Box is powered and the Thermostat has a wireless signal (T4R only).

Thermostat shows



The temperature sensor of your Thermostat is faulty, contact your installer to repair

or replace the Thermostat.

Readmore and Download Honeywell Lyric T4, T4R & T4M Thermostat User Manual

Title : Honeywell Lyric T4, T4R & T4M Thermostat User Manual
Format : PDF
Pages : 16 Pages
Language : English
File Size : 1 MB


Honeywell Lyric T4, T4R & T4M Thermostat User Manual

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