diff --git a/ChangeLog b/ChangeLog
index e535e2cb..24754fba 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -11,6 +11,7 @@
     * Add a way to download logs even on systemd journal based systems
     * Bump the API version so it is the same as the xBuddy reported one
     * Support the new multi-level telemetry data structure
+    * Don't send over serial when temperature calibration is running
 
 0.7.1rc1 (2023-08-10)
     * Fixed HTTP response status on HEAD request for non-existing files
diff --git a/prusa/link/printer_adapter/prusa_link.py b/prusa/link/printer_adapter/prusa_link.py
index 544d7325..f2037ea7 100644
--- a/prusa/link/printer_adapter/prusa_link.py
+++ b/prusa/link/printer_adapter/prusa_link.py
@@ -85,6 +85,8 @@
     PAUSE_PRINT_REGEX,
     PRINTER_BOOT_REGEX,
     RESUME_PRINT_REGEX,
+    TM_CAL_END_REGEX,
+    TM_CAL_START_REGEX,
     TM_ERROR_LOG_REGEX,
 )
 from .telemetry_passer import TelemetryPasser
@@ -225,6 +227,10 @@ def __init__(self, cfg: Config, settings: Settings) -> None:
         self.serial_parser.add_decoupled_handler(
             MBL_TRIGGER_REGEX,
             lambda sender, match: self.printer_polling.invalidate_mbl())
+        self.serial_parser.add_decoupled_handler(
+            TM_CAL_START_REGEX, self.block_serial_queue)
+        self.serial_parser.add_decoupled_handler(
+            TM_CAL_END_REGEX, self.unblock_serial_queue)
 
         self.print_stat_doubler = PrintStatDoubler(self.serial_parser,
                                                    self.printer_polling)
@@ -796,6 +802,14 @@ def instruction_confirmed(self, _) -> None:
         """
         self.state_manager.instruction_confirmed()
 
+    def block_serial_queue(self, *_, **__) -> None:
+        """Blocks the serial queue"""
+        self.serial_queue.block_sending()
+
+    def unblock_serial_queue(self, *_, **__) -> None:
+        """Unblocks the serial queue"""
+        self.serial_queue.unblock_sending()
+
     def printer_reconnected(self, *_, **__) -> None:
         """
         Connects the printer reconnect (reset) to many other components.
diff --git a/prusa/link/printer_adapter/structures/regular_expressions.py b/prusa/link/printer_adapter/structures/regular_expressions.py
index 1a529746..b4255e98 100644
--- a/prusa/link/printer_adapter/structures/regular_expressions.py
+++ b/prusa/link/printer_adapter/structures/regular_expressions.py
@@ -145,3 +145,7 @@
 TM_ERROR_CLEARED = re.compile(r"^TM: error cleared$")
 
 URLS_FOR_WIZARD = re.compile(r"/(\d{1,3})?/?")
+
+TM_CAL_START_REGEX = re.compile(r"^TM: calibration start$")
+TM_CAL_END_REGEX = re.compile(r"^(TM: calibr\. failed!)|"
+                              r"(Thermal Model settings:)$")
diff --git a/prusa/link/serial/serial_queue.py b/prusa/link/serial/serial_queue.py
index d19f7eac..a35e6e30 100644
--- a/prusa/link/serial/serial_queue.py
+++ b/prusa/link/serial/serial_queue.py
@@ -108,6 +108,9 @@ def __init__(self,
         self.m110_workaround_slot = None
         self.worked_around_m110 = False
 
+        # Allows to temporarily block sending to the serial queue
+        self._block_sending = False
+
         self.serial_parser.add_handler(CONFIRMATION_REGEX,
                                        self._confirmation_handler,
                                        priority=float("inf"))
@@ -131,6 +134,8 @@ def _keep_sending(self):
             if self.quit_evt.is_set():
                 break
             self.send_event.clear()
+            if self._block_sending:
+                continue
             with self.write_lock:
                 if not self.can_write():
                     continue
@@ -141,6 +146,16 @@ def _keep_sending(self):
                              "reader to fix the problem. In the meantime "
                              "waiting for a nudge to send again.")
 
+    def block_sending(self):
+        """Block sending of instructions until we unblock again"""
+        self._block_sending = True
+
+    def unblock_sending(self):
+        """Unblock sending of instructions"""
+        if self._block_sending:
+            self._block_sending = False
+            self._try_writing()
+
     def _try_writing(self):
         """
         Nudge the sender thread to send an instruction
@@ -550,6 +565,7 @@ def _printer_reconnected(self, was_printing):
         prctl_name()
         with self.write_lock:
             self._flush_queues()
+            self._block_sending = False
 
             final_instruction = None