diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index 021537e49..4b8852480 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -3730,13 +3730,18 @@ void Thermostat::register_device_values() {
                               MAKE_CF_CB(set_wwCircSwitchTime));
         break;
     case EMS_DEVICE_FLAG_JUNKERS:
-        register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
-                              &dateTime_,
-                              DeviceValueType::STRING,
-                              FL_(tpl_datetime),
-                              FL_(dateTime),
-                              DeviceValueUOM::NONE,
-                              MAKE_CF_CB(set_datetime));
+        if (has_flags(EMS_DEVICE_FLAG_JUNKERS_OLD)) {
+            // FR100 is not writable, see. https://github.com/emsesp/EMS-ESP32/issues/536
+            register_device_value(DeviceValueTAG::TAG_DEVICE_DATA, &dateTime_, DeviceValueType::STRING, FL_(tpl_datetime), FL_(dateTime), DeviceValueUOM::NONE);
+        } else {
+            register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
+                                  &dateTime_,
+                                  DeviceValueType::STRING,
+                                  FL_(tpl_datetime),
+                                  FL_(dateTime),
+                                  DeviceValueUOM::NONE,
+                                  MAKE_CF_CB(set_datetime));
+        }
         register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
                               &hybridStrategy_,
                               DeviceValueType::ENUM,
diff --git a/src/uart/emsuart_esp32.cpp b/src/uart/emsuart_esp32.cpp
index f22841cb0..79def3e3b 100644
--- a/src/uart/emsuart_esp32.cpp
+++ b/src/uart/emsuart_esp32.cpp
@@ -87,7 +87,7 @@ void EMSuart::start(const uint8_t tx_mode, const uint8_t rx_gpio, const uint8_t
         uart_set_pin(EMSUART_NUM, tx_gpio, rx_gpio, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
         uart_set_rx_full_threshold(EMSUART_NUM, 1);
         uart_set_rx_timeout(EMSUART_NUM, 0); // disable
-        xTaskCreate(uart_event_task, "uart_event_task", 2048, NULL, configMAX_PRIORITIES - 3, NULL);
+        xTaskCreate(uart_event_task, "uart_event_task", 2048, NULL, configMAX_PRIORITIES - 1, NULL);
     }
     tx_mode_ = tx_mode;
     uart_enable_intr_mask(EMSUART_NUM, UART_BRK_DET_INT_ENA | UART_RXFIFO_FULL_INT_ENA);