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Honeywell T4 User Manual

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T4, T4R & T4M Thermostat

User Guide

Programmable Thermostat
Programmable Modulating



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  Summary of Contents for Honeywell T4

  • Page 1: User Guide

    T4, T4R & T4M Thermostat User Guide Programmable Thermostat Wireless Programmable Thermostat Programmable Modulating Thermostat...
  • Page 3: Table Of Contents

    Away mode ....................10 Schedule Override ..................11 Temporary Override ............. 11 Timed Override ..............11 Turn Schedule Off ..............11 Changing the Batteries (T4 & T4R only) .......... 12 Wireless Receiver Box (T4R only) ............13 Troubleshooting .................... 14...
  • Page 4: Thermostat Interface

    Thermostat Interface Setpoint Room Setpoint Heat periods temperature temperature demand battery Wireless Signal (T4R only) Days of week Current time / Schedule Timer status Menu items Alert / Fault Temperature adjustment / Menu navigation Timed override Back Menu Standby mode Away mode Confirm Home screen...
  • Page 5: Menu & Navigation Icons

    Menu & Navigation Icons Menu: Options and settings of your Thermostat: Heating schedule Clock Date Keypad lock Optimisation OpenTherm® boiler alerts (T4M only) Back: Return to the previous screen/menu. Confirm: Confirm a change or selection. Cancel: Reject a change without saving. Timed override: Set a timed duration for the override.
  • Page 6: Menu

    Menu 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) Period Time °C Time °C 6:30 - 8:00 19 °C 8:00 - 10:00 19 °C...
  • Page 7 4. Press to select the day to 5. Press to select the period be adjusted and press to be adjusted and press 6. Press to adjust the 7. Press to adjust the start time and press end time and press 8.
  • Page 8: Clock

    Menu Clock To make adjustments to the clock format or time. 1. Press to enter the main menu. 2. Press to select the Clock menu and press 3. Press to change the clock format and press 4. Press to adjust the time and press Date To make adjustments to the date - Year/Month/Day.
  • Page 9: Optimisation

    Menu Optimisation Your Thermostat has optimisation functions that aim to save energy while maintaining suitable comfort levels. The Thermostat displays during the optimisation period if set. • Optimum Start learns how long it takes your home to reach a set temperature and then turns the heating on a bit earlier to achieve that temperature at the programmed time.
  • Page 10: Opentherm® Boiler Alerts (T4M Only)

    Menu OpenTherm® boiler alerts (T4M only) If you have T4M Thermostat fitted to an OpenTherm® boiler, you can view alerts received form the boiler about your heating system. 1. Press to enter the main menu. 2. Press to select the OpenTherm alerts menu and press 3.
  • Page 11: Schedule Override

    Schedule Override During normal use your Thermostat will follow the programmed schedule - indicated by icon. There are a few ways you can override the schedule to suit your current needs. Temporary Override Set until next programmed setpoint is reached. 1.
  • Page 12: Changing The Batteries (T4 & T4R Only)

    Changing the Batteries (T4 & T4R only) The Thermostat is powered by batteries, although a battery icon is not shown on the display during normal use. The only time you will see the battery icon is when they get low on power.
  • Page 13: Wireless Receiver Box (T4R Only)

    Wireless Receiver Box (T4R only) The T4R Thermostat communicates wirelessly to the Receiver Box which is wired to the boiler. If the Thermostat loses wireless communication or becomes faulty, the boiler can be switched on or off manually using the button on the Receiver Box •...
  • Page 14: 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.
  • Page 15 T4R (Wireless) Thermostat & Receiver Box only Wireless signal lost - Move the Thermostat is flashing Thermostat to another location to try and Receiver Box LED is and restore communication. flashing RED. Check Receiver Box has power by pressing Thermostat is flashing the button to switch boiler on.
  • Page 16 Programmable Thermostat Wireless Programmable Thermostat Programmable Modulating Thermostat Honeywell Control Systems Ltd. Skimped Hill Lane, Bracknell, Berkshire RG12 1EB © 2016 Honeywell International Inc. Printed in the UK 32318059-001 B...

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