Why is my Bosch TSTBM3H2CPH6W-A Thermostat not communicating with the outdoor or remote room temperature sensor?
- LLogan WilsonJul 31, 2025
If the outdoor temperature sensor or remote room temperature sensor are not communicating with the Bosch Thermostat: 1. Reestablish the communication for that particular device following the steps in the manual for that component. 2. Ensure that the remote sensor has good battery power by checking if the battery icon is present or not. The thermostat will also display “bA” next to the components name if the sensor’s batteries are low. If the battery icon is present on the sensor’s display, replace the batteries and perform the communication setup as described in that sensor’s manual.