diff --git a/lambda/display.c b/lambda/display.c
index b9e748a..9c50b5b 100644
--- a/lambda/display.c
+++ b/lambda/display.c
@@ -65,13 +65,8 @@
  * Formats and displays the time since last start/reset.
  */
 static void displayTime(void) {
-	uint32_t time = getTime();
-	uint16_t hours = time / 3600;
-	uint8_t mins = time % 3600 / 60;
-	uint8_t secs = time % 60;
-
-	char line1[17];
-	snprintf(line1, sizeof(line1), "%u:%02u:%02u", hours, mins, secs);
+	char line1[12];
+	formatTime(line1, sizeof(line1));
 	setText(MSG_TIME_SINCE_START, line1);
 }
 
diff --git a/lambda/interrupts.c b/lambda/interrupts.c
index 6e325b8..7e89b81 100644
--- a/lambda/interrupts.c
+++ b/lambda/interrupts.c
@@ -47,6 +47,15 @@
 	return getInts() / INTS_PER_SEC;
 }
 
+void formatTime(char* const str, size_t const size) {
+	uint32_t time = getTime();
+	uint16_t hours = time / 3600;
+	uint8_t mins = time % 3600 / 60;
+	uint8_t secs = time % 60;
+
+	snprintf(str, size, "%5u:%02u:%02u", hours, mins, secs);
+}
+
 void resetTime(void) {
 	ATOMIC_BLOCK(ATOMIC_FORCEON) {
 		ints = 0;
diff --git a/lambda/interrupts.h b/lambda/interrupts.h
index 343a8e1..2a5c580 100644
--- a/lambda/interrupts.h
+++ b/lambda/interrupts.h
@@ -26,6 +26,11 @@
 uint32_t getTime(void);
 
 /**
+ * Writes the time since last reset in format HHHHH:MM:SS to the given string.
+ */
+void formatTime(char* str, size_t size);
+
+/**
  * Resets the time to 0.
  */
 void resetTime(void);
diff --git a/lambda/sensors.c b/lambda/sensors.c
index ed608d2..b084d6d 100644
--- a/lambda/sensors.c
+++ b/lambda/sensors.c
@@ -187,7 +187,7 @@
 	}
 }
 
-void setHeatingOn(bool on) {
+void setHeatingOn(bool const on) {
 	if (on) {
 		PORTB |= (1 << PB2);
 		heatingState = HEATING_UP;
@@ -195,7 +195,7 @@
 	} else {
 		PORTB &= ~(1 << PB2);
 		heatingState = HEATING_OFF;
-		cancelAlert(true);
+		// cancelAlert(true);
 	}
 }
 
@@ -203,7 +203,7 @@
 	return bit_is_set(PORTB, PB2);
 }
 
-void setHeatingState(int8_t state) {
+void setHeatingState(int8_t const state) {
 	heatingState = state;
 }