diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c450e1a..2d963ab4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,13 @@ will consitute of a breaking change warranting a new major release:
 
 # [v4.0.0] to be released
 
+# [v3.1.0]
+
+## Fixed
+
+- TCS heater switch enumeration naming was old/wrong and was not updated in sync with the object ID
+  update. This lead to the TCS controller commanding the wrong heaters.
+
 # [v3.0.0] 2023-06-11
 
 - `eive-tmtc` version v4.0.0
diff --git a/mission/controller/ThermalController.cpp b/mission/controller/ThermalController.cpp
index 6205ce44..53babbd5 100644
--- a/mission/controller/ThermalController.cpp
+++ b/mission/controller/ThermalController.cpp
@@ -1002,7 +1002,7 @@ void ThermalController::copyDevices() {
 
 void ThermalController::ctrlAcsBoard() {
   heater::Switch switchNr = heater::HEATER_2_ACS_BRD;
-  heater::Switch redSwitchNr = heater::HEATER_0_OBC_BRD;
+  heater::Switch redSwitchNr = heater::HEATER_3_OBC_BRD;
 
   // A side
   thermalComponent = ACS_BOARD;
@@ -1067,7 +1067,7 @@ void ThermalController::ctrlMgt() {
   sensors[2].first = sensorTemperatures.plpcduHeatspreader.isValid();
   sensors[2].second = sensorTemperatures.plpcduHeatspreader.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_2_ACS_BRD, heater::HEATER_3_PCDU_PDU, mgtLimits);
+  HeaterContext htrCtx(heater::HEATER_2_ACS_BRD, heater::HEATER_1_PCDU_PDU, mgtLimits);
   ctrlComponentTemperature(htrCtx);
   if (componentAboveUpperLimit and not mgtTooHotFlag) {
     triggerEvent(tcsCtrl::MGT_OVERHEATING, tempFloatToU32());
@@ -1206,7 +1206,7 @@ void ThermalController::ctrlIfBoard() {
   sensors[2].first = deviceTemperatures.mgm2SideB.isValid();
   sensors[2].second = deviceTemperatures.mgm2SideB.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_2_ACS_BRD, heater::HEATER_3_PCDU_PDU, ifBoardLimits);
+  HeaterContext htrCtx(heater::HEATER_2_ACS_BRD, heater::HEATER_1_PCDU_PDU, ifBoardLimits);
   ctrlComponentTemperature(htrCtx);
   // TODO: special event overheating + could go back to safe mode
 }
@@ -1220,7 +1220,7 @@ void ThermalController::ctrlTcsBoard() {
   sensors[2].first = sensorTemperatures.tmp1075Tcs1.isValid();
   sensors[2].second = sensorTemperatures.tmp1075Tcs1.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_0_OBC_BRD, heater::HEATER_2_ACS_BRD, tcsBoardLimits);
+  HeaterContext htrCtx(heater::HEATER_3_OBC_BRD, heater::HEATER_2_ACS_BRD, tcsBoardLimits);
   ctrlComponentTemperature(htrCtx);
   // TODO: special event overheating + could go back to safe mode
 }
@@ -1234,7 +1234,7 @@ void ThermalController::ctrlObc() {
   sensors[2].first = sensorTemperatures.tmp1075Tcs0.isValid();
   sensors[2].second = sensorTemperatures.tmp1075Tcs0.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_0_OBC_BRD, heater::HEATER_2_ACS_BRD, obcLimits);
+  HeaterContext htrCtx(heater::HEATER_3_OBC_BRD, heater::HEATER_2_ACS_BRD, obcLimits);
   ctrlComponentTemperature(htrCtx);
   if (componentAboveUpperLimit and not obcTooHotFlag) {
     triggerEvent(tcsCtrl::OBC_OVERHEATING, tempFloatToU32());
@@ -1253,7 +1253,7 @@ void ThermalController::ctrlObcIfBoard() {
   sensors[2].first = sensorTemperatures.tmp1075Tcs1.isValid();
   sensors[2].second = sensorTemperatures.tmp1075Tcs1.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_0_OBC_BRD, heater::HEATER_2_ACS_BRD, obcIfBoardLimits);
+  HeaterContext htrCtx(heater::HEATER_3_OBC_BRD, heater::HEATER_2_ACS_BRD, obcIfBoardLimits);
   ctrlComponentTemperature(htrCtx);
   if (componentAboveUpperLimit and not obcTooHotFlag) {
     triggerEvent(tcsCtrl::OBC_OVERHEATING, tempFloatToU32());
@@ -1288,7 +1288,7 @@ void ThermalController::ctrlPcduP60Board() {
   sensors[1].first = deviceTemperatures.temp2P60dock.isValid();
   sensors[1].second = deviceTemperatures.temp2P60dock.value;
   numSensors = 2;
-  HeaterContext htrCtx(heater::HEATER_3_PCDU_PDU, heater::HEATER_2_ACS_BRD, pcduP60BoardLimits);
+  HeaterContext htrCtx(heater::HEATER_1_PCDU_PDU, heater::HEATER_2_ACS_BRD, pcduP60BoardLimits);
   ctrlComponentTemperature(htrCtx);
   if (componentAboveUpperLimit and not pcduSystemTooHotFlag) {
     triggerEvent(tcsCtrl::PCDU_SYSTEM_OVERHEATING, tempFloatToU32());
@@ -1300,7 +1300,7 @@ void ThermalController::ctrlPcduP60Board() {
 
 void ThermalController::ctrlPcduAcu() {
   thermalComponent = PCDUACU;
-  heater::Switch switchNr = heater::HEATER_3_PCDU_PDU;
+  heater::Switch switchNr = heater::HEATER_1_PCDU_PDU;
   heater::Switch redSwitchNr = heater::HEATER_2_ACS_BRD;
 
   if (chooseHeater(switchNr, redSwitchNr)) {
@@ -1340,7 +1340,7 @@ void ThermalController::ctrlPcduPdu() {
   sensors[2].first = sensorTemperatures.tmp1075Tcs0.isValid();
   sensors[2].second = sensorTemperatures.tmp1075Tcs0.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_3_PCDU_PDU, heater::HEATER_2_ACS_BRD, pcduPduLimits);
+  HeaterContext htrCtx(heater::HEATER_1_PCDU_PDU, heater::HEATER_2_ACS_BRD, pcduPduLimits);
   ctrlComponentTemperature(htrCtx);
   if (componentAboveUpperLimit and not pcduSystemTooHotFlag) {
     triggerEvent(tcsCtrl::PCDU_SYSTEM_OVERHEATING, tempFloatToU32());
@@ -1361,7 +1361,7 @@ void ThermalController::ctrlPlPcduBoard() {
   sensors[3].first = sensorTemperatures.plpcduHeatspreader.isValid();
   sensors[3].second = sensorTemperatures.plpcduHeatspreader.value;
   numSensors = 4;
-  HeaterContext htrCtx(heater::HEATER_3_PCDU_PDU, heater::HEATER_2_ACS_BRD, plPcduBoardLimits);
+  HeaterContext htrCtx(heater::HEATER_1_PCDU_PDU, heater::HEATER_2_ACS_BRD, plPcduBoardLimits);
   ctrlComponentTemperature(htrCtx);
   tooHotHandler(objects::PLPCDU_HANDLER, eBandTooHotFlag);
 }
@@ -1375,7 +1375,7 @@ void ThermalController::ctrlPlocMissionBoard() {
   sensors[2].first = sensorTemperatures.dacHeatspreader.isValid();
   sensors[2].second = sensorTemperatures.dacHeatspreader.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_1_PLOC_PROC_BRD, heater::HEATER_0_OBC_BRD,
+  HeaterContext htrCtx(heater::HEATER_0_PLOC_PROC_BRD, heater::HEATER_3_OBC_BRD,
                        plocMissionBoardLimits);
   ctrlComponentTemperature(htrCtx);
   tooHotHandler(objects::PLOC_SUPERVISOR_HANDLER, plocTooHotFlag);
@@ -1390,7 +1390,7 @@ void ThermalController::ctrlPlocProcessingBoard() {
   sensors[2].first = sensorTemperatures.dacHeatspreader.isValid();
   sensors[2].second = sensorTemperatures.dacHeatspreader.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_1_PLOC_PROC_BRD, heater::HEATER_0_OBC_BRD,
+  HeaterContext htrCtx(heater::HEATER_0_PLOC_PROC_BRD, heater::HEATER_3_OBC_BRD,
                        plocProcessingBoardLimits);
   ctrlComponentTemperature(htrCtx);
   tooHotHandler(objects::PLOC_SUPERVISOR_HANDLER, plocTooHotFlag);
@@ -1405,7 +1405,7 @@ void ThermalController::ctrlDac() {
   sensors[2].first = sensorTemperatures.plocHeatspreader.isValid();
   sensors[2].second = sensorTemperatures.plocHeatspreader.value;
   numSensors = 3;
-  HeaterContext htrCtx(heater::HEATER_1_PLOC_PROC_BRD, heater::HEATER_0_OBC_BRD, dacLimits);
+  HeaterContext htrCtx(heater::HEATER_0_PLOC_PROC_BRD, heater::HEATER_3_OBC_BRD, dacLimits);
   ctrlComponentTemperature(htrCtx);
   tooHotHandler(objects::PLPCDU_HANDLER, eBandTooHotFlag);
 }
diff --git a/mission/tcs/defs.h b/mission/tcs/defs.h
index cb1a73e4..747dbc6d 100644
--- a/mission/tcs/defs.h
+++ b/mission/tcs/defs.h
@@ -5,10 +5,10 @@
 
 namespace heater {
 enum Switch : uint8_t {
-  HEATER_0_OBC_BRD,
-  HEATER_1_PLOC_PROC_BRD,
+  HEATER_0_PLOC_PROC_BRD,
+  HEATER_1_PCDU_PDU,
   HEATER_2_ACS_BRD,
-  HEATER_3_PCDU_PDU,
+  HEATER_3_OBC_BRD,
   HEATER_4_CAMERA,
   HEATER_5_STR,
   HEATER_6_DRO,