diff --git a/firmware/waveshare-thermostat.yaml b/firmware/waveshare-thermostat.yaml
index ee8d86b..f1d9d69 100644
--- a/firmware/waveshare-thermostat.yaml
+++ b/firmware/waveshare-thermostat.yaml
@@ -39,6 +39,9 @@ ota:
 
 logger:
   level: DEBUG
+  hardware_uart: UART0   # this board's "UART" USB-C port (used for flashing) also does log printing
+                          # per Waveshare's docs — ESPHome defaults S3 boards to USB_SERIAL_JTAG,
+                          # a different physical port, which is why logs went silent
 
 packages:
   display: !include components/display.yaml