diff --git a/src/lib/ebus/device.cpp b/src/lib/ebus/device.cpp
index f581a234..319edf87 100755
--- a/src/lib/ebus/device.cpp
+++ b/src/lib/ebus/device.cpp
@@ -316,7 +316,7 @@ result_t Device::recv(unsigned int timeout, symbol_t* value, ArbitrationState* a
 
 result_t Device::startArbitration(symbol_t masterAddress) {
   if (m_arbitrationCheck) {
-    return RESULT_ERR_SEND; // should not occur
+    return RESULT_ERR_ARB_RUNNING; // should not occur
   }
   if (m_readOnly) {
     return RESULT_ERR_SEND;
diff --git a/src/lib/ebus/result.cpp b/src/lib/ebus/result.cpp
index 5616bfa8..b1c0f6fb 100755
--- a/src/lib/ebus/result.cpp
+++ b/src/lib/ebus/result.cpp
@@ -44,6 +44,7 @@ const char* getResultCode(result_t resultCode) {
   case RESULT_ERR_DUPLICATE:    return "ERR: duplicate entry";
   case RESULT_ERR_DUPLICATE_NAME: return "ERR: duplicate name";
   case RESULT_ERR_BUS_LOST:     return "ERR: arbitration lost";
+  case RESULT_ERR_ARB_RUNNING:     return "ERR: arbitration running";
   case RESULT_ERR_CRC:          return "ERR: CRC error";
   case RESULT_ERR_ACK:          return "ERR: ACK error";
   case RESULT_ERR_NAK:          return "ERR: NAK received";
diff --git a/src/lib/ebus/result.h b/src/lib/ebus/result.h
index 53470901..2ab59870 100755
--- a/src/lib/ebus/result.h
+++ b/src/lib/ebus/result.h
@@ -56,15 +56,16 @@ enum result_t {
   RESULT_ERR_DUPLICATE_NAME = -17,  //!< duplicate entry (name)
 
   RESULT_ERR_BUS_LOST = -18,        //!< arbitration lost
-  RESULT_ERR_CRC = -19,             //!< CRC error
-  RESULT_ERR_ACK = -20,             //!< ACK error
-  RESULT_ERR_NAK = -21,             //!< NAK received
+  RESULT_ERR_ARB_RUNNING = -19,     //!< arbitration running
+  RESULT_ERR_CRC = -20,             //!< CRC error
+  RESULT_ERR_ACK = -21,             //!< ACK error
+  RESULT_ERR_NAK = -22,             //!< NAK received
 
-  RESULT_ERR_NO_SIGNAL = -22,       //!< no signal found on the bus
-  RESULT_ERR_SYN = -23,             //!< SYN received instead of answer
-  RESULT_ERR_SYMBOL = -24,          //!< wrong symbol received instead of sent symbol
+  RESULT_ERR_NO_SIGNAL = -23,       //!< no signal found on the bus
+  RESULT_ERR_SYN = -24,             //!< SYN received instead of answer
+  RESULT_ERR_SYMBOL = -25,          //!< wrong symbol received instead of sent symbol
 
-  RESULT_ERR_NOTAUTHORIZED = -25    //!< not authorized for this action
+  RESULT_ERR_NOTAUTHORIZED = -26    //!< not authorized for this action
 };