Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -ra8a9efaaea2ba9f38705b4ec2d47ff1252c833e2 -rc52b833962efeed9be0616e3981d8a67ce6ae2d7
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision a8a9efaaea2ba9f38705b4ec2d47ff1252c833e2)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision c52b833962efeed9be0616e3981d8a67ce6ae2d7)
@@ -67,8 +67,8 @@
 #define D5_HEAT_TX_INIT_FEED_FORWARD                               0.0F                                                            ///< Initial Feed forward term for heater control
 
 // PI controller gain with initial Open loop and FF later
-#define D5_HEAT_TX_P_COEFFICIENT                                   0.015F                                                           ///< P Term for AC primary heater control during treatment mode.
-#define D5_HEAT_TX_I_COEFFICIENT                                   0.00007F                                                         ///< I Term for AC primary heater control during treatment mode.
+#define D5_HEAT_TX_P_COEFFICIENT                                   0.015F                                                          ///< P Term for AC primary heater control during treatment mode.
+#define D5_HEAT_TX_I_COEFFICIENT                                   0.0021F                                                         ///< I Term for AC primary heater control during treatment mode.
 
 #define D45_HEAT_P_COEFFICIENT                                     0.35F                                                           ///< P Term for trimmer heater control.
 #define D45_HEAT_I_COEFFICIENT                                     0.05F                                                           ///< I Term for trimmer heater control.