BOSCH RT20 RF Room Thermostat User Manual

Bosch RT20 Manual: Questions and Answers

Bosch RT20 specifications

Full specifications, page 22

What do the power terminal and control terminal on the Bosch RT20 receiver do?

Connect blue and brown wires to power, black wire to control.

User Manual, p. 24

Can I mount the Bosch RT20 thermostat on a wall box instead of the wall?

Yes, it fits a 86x86mm wall box and must be secured with screws only. User Manual, p. 25

How do I connect the receiver to my boiler?

Turn off the boiler, remove the terminal short wiring, and connect the T.A wire.

1. Disconnect the boiler power supply
2. Find the terminal for the receiver connection
3. Remove the terminal short wiring
4. Connect the T.A wire to that terminal User Manual, p. 24

What's the difference between green and red LED on Bosch RT20 receiver?

Green LED stays on when heating is turned ON. Red LED stays on when heating is turned OFF.

User Manual, p. 27

How do I set the target temperature on Bosch RT20?

Rotate the temperature knob to adjust the target temperature.

1. Rotate the knob clockwise to increase temperature or counter-clockwise to decrease it.
2. The target temperature displays when you rotate the knob.
3. After the value flashes 5 times, the chosen temperature is set. User Manual, p. 27

What does it mean when Bosch RT20 receiver red LED flashes fast and slowly alternately?

The thermostat and receiver have failed to communicate. The heating is automatically turned OFF. User Manual, p. 27

What temperature range can you set on Bosch RT20?

Room temperature setting range is 3~35°C with 0.2°C accuracy. User Manual, p. 22

Do you need to replace batteries in the Bosch RT20 thermostat?

Yes. The thermostat runs on two 1.5V LR03/AAA batteries with a lifetime over 1 year. Press the cover-opening button while turning it out to access the battery compartment. User Manual, p. 22

What's the wireless range for the Bosch RT20 receiver?

868MHz on open areas covers up to 100 meters. User Manual, p. 22

Bosch RT20 compared with other room thermostats

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