Quick Start — Therma One T1

What's in the box

1. Therma One T1 thermostat unit
2. Wall mounting plate
3. Wiring labels (8 pre-printed)
4. M3 screws and wall anchors (x4)
5. USB-C power adapter
6. Quick start card

Step 1: Switch off power at the breaker

Locate the circuit breaker controlling your heating and cooling system and switch it off before touching any wiring. Confirm power is off by checking that your existing thermostat has no display.

Step 2: Remove your old thermostat and label the wires

Take a photo of the existing wiring before disconnecting anything. Use the included wiring labels to mark each wire with its terminal letter (R, G, Y, W, C, etc.) before removing them.

Step 3: Mount the wall plate

Attach the wall plate to the wall using the supplied screws. Use the built-in bubble level to confirm it is straight. Feed your labelled wires through the central opening.

Step 4: Connect the wires

Match each labelled wire to the corresponding terminal on the wall plate and tighten the screws firmly. The C-wire (common) is required for continuous power. If your system lacks a C-wire, the included adapter works with most 4-wire systems.

Step 5: Attach the T1 unit

Align the thermostat body with the wall plate and press until it clicks into place. Restore power at the breaker. The display will illuminate within a few seconds.

Step 6: Connect to Wi-Fi

Follow the on-screen setup wizard. Select your Wi-Fi network and enter your password using the touchscreen. The T1 will confirm connection with a brief chime and display the current temperature.

Step 7: Set your first schedule

In the app or on the thermostat, go to Schedule > Create. Set at least two time slots — one for daytime comfort temperature and one for overnight setback. The T1 learns your preferences over the first 7 days.

Tips

• Place the T1 away from direct sunlight, vents, and exterior walls for accurate readings.
• Enable Away Mode in the app when leaving home for extended periods.
• The T1 supports multi-zone setups — add additional units through the app under Home > Add Device.