honeywell home t3r programmable wireless thermostat

Honeywell Home T3R Programmable Wireless Thermostat

Code: Honeywell Home T3R
Honeywell T3R wireless thermostat. reliable Programmable heating control. Battery powered. Ideal for use with combi boilers, gas boilers & heat pumps. LCD Display. Flexible scheduling options. Discover more below.
£55.00
(Incl VAT VAT£66.00)
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Honeywell T3R Wireless Thermostat

The Honeywell T3R wireless thermostat offers programmable heating control with 7-day scheduling, fuzzy logic, and frost protection. Ideal for homes with gas boilers, combi-boilers, or heat pumps. Features include wireless operation, LCD display, boiler service timer, and seasonal auto-changeover.

  • Wireless & battery operated – easy to install and use
  • Large LCD display – clear, user-friendly interface
  • 7-day or 5/2-day programs – flexible heating schedules
  • Up to 4 time/temperature settings per day – fine-tuned control
  • Fuzzy Logic & optimisation features – maintains accurate room temperatures
  • Boiler service timer – keeps maintenance on track
  • Automatic summer/winter changeover – adjusts with the seasons
  • Manual & timed override options – control when you need it
  • Frost protection (OFF mode) – protects pipes in cold conditions
  • Compatible with 24-230V on/off systems – works with gas boilers, combi-boilers, and heat pumps
  • Suitable for zone valve applications – but not for electric heating (240V systems)
  • Please note: Holiday mode is not included

How do I set my Honeywell thermostat?

To program your Honeywell T3R thermostat:

  1. Press the MENU button.
  2. Select PROG and press the tick (✓) to confirm.
  3. Choose the day of the week and confirm.
  4. Select a time period and set the desired temperature.
  5. Repeat for each period and day as needed.
  6. Use the COPY function to duplicate schedules.
  7. Hold the left button for 3 seconds to delete a time period.
  8. Press RETURN to exit.

Does the Honeywell Home thermostat need batteries?

Yes, the Honeywell Home thermostat (T3R) is battery-operated and requires two AA batteries for operation.

What happens when the Honeywell thermostat battery dies?

A flashing battery icon will appear when the batteries are low. If they are not replaced, the thermostat will stop controlling your heating system until new batteries are inserted.

How do I reset the Honeywell thermostat after replacing batteries?

After battery replacement, the T3R should resume normal function without a reset. If it doesn’t:

  • Ensure the batteries are inserted correctly — e.g. properly clicked into place, polarities matched up, etc.
  • Check the display for errors and consult the user manual for guidance.

How can I tell if a Honeywell thermostat needs new batteries?

A solid battery icon means about 10% battery life remains. A flashing icon signals critically low battery and indicates immediate replacement is needed.

What is the hold button on a Honeywell thermostat?

The T3R doesn’t have a "Hold" button, but it offers override functions:

  • Temporary Override: Adjust temperature manually; it will revert at the next schedule change.
  • Permanent Override: Press and hold both arrow buttons for 5 seconds to maintain a set temperature. Press MENU to cancel.

How do I change the settings on my thermostat?

  1. Press the MENU button.
  2. Navigate to SETTINGS and confirm.
  3. Adjust options such as language, cycle rate, or display preferences.
  4. Confirm each change and press RETURN to exit.

How do you reset a Honeywell T3R thermostat?

  1. Press MENU.
  2. Select SETTINGS and press the tick.
  3. Choose RESET and confirm to return the thermostat to factory settings.

Note: This will delete all schedules and preferences.

Honeywell T3R Thermostat – Installation Guide

Important Disclaimer: The information below is for general guidance only and is based on the official Honeywell installation manual. All installation and wiring must be carried out by a qualified professional. Do not attempt installation unless you are suitably trained. Always switch off mains power before carrying out any electrical work.

1. Mounting the Relay Box

Choose a location near your boiler or heating system.

Securely mount the relay box using screws and wall plugs.

Leave at least 30cm clearance around the unit.

2. Wiring the Relay Box

Supports 24–230V on/off appliances including combi boilers, standard boilers, and 2-port zone valves.

  • Use correct L, N, and switched live terminals.
  • Strip multi-core cables to fit neatly into the block.
  • Bundle single-core wires with a cable tie near the terminal block.

3. Pairing the Thermostat

The thermostat is pre-bound to the relay box. If re-binding is needed, follow the binding procedure in the manual.

4. Thermostat Positioning

  • Mount on an internal wall, around 1.5m above the floor.
  • Avoid heat sources, draughts, or direct sunlight.

5. Initial Setup Options

  • Language selection
  • Cycle rate (6 for gas boilers)
  • Minimum on time (default 1 minute)
  • Temperature limits
  • 7-day or 5+2 scheduling
  • Backlight, time format, daylight saving

Reminder: Installation should only be performed by a qualified heating engineer or electrician.

Honeywell T3R Wireless Thermostat

The Honeywell T3R wireless thermostat offers programmable heating control with 7-day scheduling, fuzzy logic, and frost protection. Ideal for homes with gas boilers, combi-boilers, or heat pumps. Features include wireless operation, LCD display, boiler service timer, and seasonal auto-changeover.

  • Wireless & battery operated – easy to install and use
  • Large LCD display – clear, user-friendly interface
  • 7-day or 5/2-day programs – flexible heating schedules
  • Up to 4 time/temperature settings per day – fine-tuned control
  • Fuzzy Logic & optimisation features – maintains accurate room temperatures
  • Boiler service timer – keeps maintenance on track
  • Automatic summer/winter changeover – adjusts with the seasons
  • Manual & timed override options – control when you need it
  • Frost protection (OFF mode) – protects pipes in cold conditions
  • Compatible with 24-230V on/off systems – works with gas boilers, combi-boilers, and heat pumps
  • Suitable for zone valve applications – but not for electric heating (240V systems)
  • Please note: Holiday mode is not included

How do I set my Honeywell thermostat?

To program your Honeywell T3R thermostat:

  1. Press the MENU button.
  2. Select PROG and press the tick (✓) to confirm.
  3. Choose the day of the week and confirm.
  4. Select a time period and set the desired temperature.
  5. Repeat for each period and day as needed.
  6. Use the COPY function to duplicate schedules.
  7. Hold the left button for 3 seconds to delete a time period.
  8. Press RETURN to exit.

Does the Honeywell Home thermostat need batteries?

Yes, the Honeywell Home thermostat (T3R) is battery-operated and requires two AA batteries for operation.

What happens when the Honeywell thermostat battery dies?

A flashing battery icon will appear when the batteries are low. If they are not replaced, the thermostat will stop controlling your heating system until new batteries are inserted.

How do I reset the Honeywell thermostat after replacing batteries?

After battery replacement, the T3R should resume normal function without a reset. If it doesn’t:

  • Ensure the batteries are inserted correctly — e.g. properly clicked into place, polarities matched up, etc.
  • Check the display for errors and consult the user manual for guidance.

How can I tell if a Honeywell thermostat needs new batteries?

A solid battery icon means about 10% battery life remains. A flashing icon signals critically low battery and indicates immediate replacement is needed.

What is the hold button on a Honeywell thermostat?

The T3R doesn’t have a "Hold" button, but it offers override functions:

  • Temporary Override: Adjust temperature manually; it will revert at the next schedule change.
  • Permanent Override: Press and hold both arrow buttons for 5 seconds to maintain a set temperature. Press MENU to cancel.

How do I change the settings on my thermostat?

  1. Press the MENU button.
  2. Navigate to SETTINGS and confirm.
  3. Adjust options such as language, cycle rate, or display preferences.
  4. Confirm each change and press RETURN to exit.

How do you reset a Honeywell T3R thermostat?

  1. Press MENU.
  2. Select SETTINGS and press the tick.
  3. Choose RESET and confirm to return the thermostat to factory settings.

Note: This will delete all schedules and preferences.

Honeywell T3R Thermostat – Installation Guide

Important Disclaimer: The information below is for general guidance only and is based on the official Honeywell installation manual. All installation and wiring must be carried out by a qualified professional. Do not attempt installation unless you are suitably trained. Always switch off mains power before carrying out any electrical work.

1. Mounting the Relay Box

Choose a location near your boiler or heating system.

Securely mount the relay box using screws and wall plugs.

Leave at least 30cm clearance around the unit.

2. Wiring the Relay Box

Supports 24–230V on/off appliances including combi boilers, standard boilers, and 2-port zone valves.

  • Use correct L, N, and switched live terminals.
  • Strip multi-core cables to fit neatly into the block.
  • Bundle single-core wires with a cable tie near the terminal block.

3. Pairing the Thermostat

The thermostat is pre-bound to the relay box. If re-binding is needed, follow the binding procedure in the manual.

4. Thermostat Positioning

  • Mount on an internal wall, around 1.5m above the floor.
  • Avoid heat sources, draughts, or direct sunlight.

5. Initial Setup Options

  • Language selection
  • Cycle rate (6 for gas boilers)
  • Minimum on time (default 1 minute)
  • Temperature limits
  • 7-day or 5+2 scheduling
  • Backlight, time format, daylight saving

Reminder: Installation should only be performed by a qualified heating engineer or electrician.

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