Honeywell T3, T3R, T3M Programmable Thermostat

Screen and Button Overview

This section details the various buttons and screen elements of the thermostat.

Default Schedule

The thermostat comes with a pre-programmed default schedule for energy efficiency.

Adjusting the Schedule

Follow these steps to modify your heating schedule.

1. Press the [MENU] button.
2. Select [PROG] and confirm.
3. Adjust the time for the selected period and confirm.
4. Adjust the temperature for the selected period and confirm.
5. Select the desired schedule period (P1, P2, P3, P4) and confirm.
6. To save changes, hold the [◀️ Left button] for 3 seconds.

Copy Day

This feature allows you to copy the schedule from one day to another.

1. Select the source day you wish to copy from and confirm.
2. Select the schedule period you want to copy and confirm.
3. Select the source day again and press the [COPY] button.
4. Select the destination day (the day you want to copy to) and confirm.

Delete Period

Use this function to remove a specific period from your schedule.

1. Select the day from which you want to delete a period and confirm.
2. Select the period you wish to delete and confirm.
3. To confirm deletion, press and hold the [◀️ Left button] for 3 seconds.

Device Modes

The thermostat offers different operating modes to suit your needs.

• [AUTO] Mode: Follows the programmed schedule.
• [MAN] Mode: Maintains a constant set temperature, overriding the schedule.
• [OFF] Mode: Turns heating off.

Temperature Override

Temporarily change the temperature setting without altering the main schedule.

• Temporary Override: Press the [+1h] button to temporarily adjust the temperature until the next scheduled period begins.
• Permanent Override: Manually adjust the temperature using the [▶️ Right button] or [◀️ Left button]. The thermostat will maintain this temperature until manually changed back or until the next scheduled period if the override is set to be temporary.

Keypad Lock

Prevent accidental changes to settings by locking the keypad.

• To Lock: Hold the [◀️ Left button] and [▶️ Right button] simultaneously for 5 seconds.
• To Unlock: Hold the [◀️ Left button] and [▶️ Right button] simultaneously for 5 seconds.

Date and Time Setup

Ensure accurate time and date settings for proper schedule operation.

1. Press the [MENU] button.
2. Select [Settings] and confirm.
3. Set the current Month (1-12) and confirm.
4. Select YEAR and confirm.
5. Set the current Year and confirm.
6. Repeat the process to set the Day, Hour, and Minute.

Troubleshooting

Common issues and their solutions.

• ? [Battery] 10% Battery Power: The thermostat is running low on battery. Replace batteries soon.
• ? [Battery] Critical Low Battery: Battery is critically low. Replace batteries immediately.
• ⚠️ [Warning] Faulty Sensor: Indicates a problem with the internal or external temperature sensor. Contact support.
• ? [WiFi] Wireless Signal Loss (T3R Only): The wireless connection between the thermostat and receiver is lost. Check router and receiver.
• ♨️ [Boiler] Boiler Service Reminder (UK Only): The thermostat indicates that your boiler is due for servicing. Please contact your landlord or local housing authority.