diff --git a/heater.c b/heater.c
index 5b93e36..dc5a787 100644
--- a/heater.c
+++ b/heater.c
@@ -457,20 +457,6 @@ uint8_t heaters_all_zero() {
   return 255;
 }
 
-/** \brief turn off all heaters
-
-	for emergency stop
-*/
-uint8_t heaters_all_off() {
-	uint8_t i;
-	for (i = 0; i < NUM_HEATERS; i++) {
-		if (heaters_runtime[i].heater_output > 0)
-			return 0;
-	}
-
-	return 255;
-}
-
 #ifdef EECONFIG
 /** \brief set heater P factor
 	\param index heater to change factor for
diff --git a/heater.h b/heater.h
index a6f8746..c16e6e3 100644
--- a/heater.h
+++ b/heater.h
@@ -22,7 +22,6 @@ void heater_set(heater_t index, uint8_t value);
 void heater_tick(heater_t h, temp_type_t type, uint16_t current_temp, uint16_t target_temp);
 
 uint8_t heaters_all_zero(void);
-uint8_t heaters_all_off(void);
 
 #ifdef EECONFIG
 void pid_set_p(heater_t index, int32_t p);