diff --git a/src/main/java/dev/dsf/bpe/CodeSystem.java b/src/main/java/dev/dsf/bpe/CodeSystem.java
index 1d618af9..bfaa0e82 100644
--- a/src/main/java/dev/dsf/bpe/CodeSystem.java
+++ b/src/main/java/dev/dsf/bpe/CodeSystem.java
@@ -387,6 +387,10 @@ public enum Concept
 					"send-message-http-502",
 					"Sending a message to the remote instance resulted in HTTP status 502"
 			),
+			SEND_MESSAGE_HTTP_503(
+					"send-message-http-503",
+					"Sending a message to the remote instance resulted in HTTP status 503"
+			),
 			SEND_MESSAGE_HTTP_504(
 					"send-message-http-504",
 					"Sending a message to the remote instance resulted in HTTP status 504"
@@ -432,6 +436,10 @@ public enum Concept
 					"receive-message-http-502",
 					"Received a message and responded with HTTP status 502"
 			),
+			RECEIVE_MESSAGE_HTTP_503(
+					"receive-message-http-503",
+					"Received a message and responded with HTTP status 503"
+			),
 			RECEIVE_MESSAGE_HTTP_504(
 					"receive-message-http-504",
 					"Received a message and responded with HTTP status 504"
@@ -485,6 +493,10 @@ public enum Concept
 					"local-binary-delete-http-502",
 					"Local instance encountered a HTTP status 502 trying to clean up the binary resource"
 			),
+			LOCAL_BINARY_DELETE_HTTP_503(
+					"local-binary-delete-http-503",
+					"Local instance encountered a HTTP status 503 trying to clean up the binary resource"
+			),
 			LOCAL_BINARY_DELETE_HTTP_504(
 					"local-binary-delete-http-504",
 					"Local instance encountered a HTTP status 504 trying to clean up the binary resource"
@@ -522,6 +534,10 @@ public enum Concept
 					"remote-binary-delete-http-502",
 					"Remote instance encountered a HTTP status 502 trying to clean up the binary resource"
 			),
+			REMOTE_BINARY_DELETE_HTTP_503(
+					"remote-binary-delete-http-503",
+					"Remote instance encountered a HTTP status 503 trying to clean up the binary resource"
+			),
 			REMOTE_BINARY_DELETE_HTTP_504(
 					"remote-binary-delete-http-504",
 					"Remote instance encountered a HTTP status 504 trying to clean up the binary resource"
@@ -551,6 +567,10 @@ public enum Concept
 					"local-binary-post-http-502",
 					"Local instance encountered a HTTP status 502 trying to post the binary resource to its own FHIR server"
 			),
+			LOCAL_BINARY_POST_HTTP_503(
+					"local-binary-post-http-503",
+					"Local instance encountered a HTTP status 503 trying to post the binary resource to its own FHIR server"
+			),
 			LOCAL_BINARY_POST_HTTP_504(
 					"local-binary-post-http-504",
 					"Local instance encountered a HTTP status 504 trying to post the binary resource to its own FHIR server"
@@ -592,6 +612,10 @@ public enum Concept
 					"remote-binary-post-http-502",
 					"Remote instance encountered a HTTP status 502 trying to post the binary resource to its own FHIR server"
 			),
+			REMOTE_BINARY_POST_HTTP_503(
+					"remote-binary-post-http-503",
+					"Remote instance encountered a HTTP status 503 trying to post the binary resource to its own FHIR server"
+			),
 			REMOTE_BINARY_POST_HTTP_504(
 					"remote-binary-post-http-504",
 					"Remote instance encountered a HTTP status 504 trying to post the binary resource to its own FHIR server"
@@ -650,6 +674,10 @@ public enum Concept
 					"response-message-timeout-http-502",
 					"Response message timed out. Received HTTP status 502 trying to check request status on the target"
 			),
+			RESPONSE_MESSAGE_TIMEOUT_HTTP_503(
+					"response-message-timeout-http-503",
+					"Response message timed out. Received HTTP status 503 trying to check request status on the target"
+			),
 			RESPONSE_MESSAGE_TIMEOUT_HTTP_504(
 					"response-message-timeout-http-504",
 					"Response message timed out. Received HTTP status 504 trying to check request status on the target"
@@ -684,6 +712,10 @@ public enum Concept
 					"local-binary-download-http-502",
 					"Local instance received HTTP status 502 trying to download the binary resource from the target"
 			),
+			LOCAL_BINARY_DOWNLOAD_HTTP_503(
+					"local-binary-download-http-503",
+					"Local instance received HTTP status 503 trying to download the binary resource from the target"
+			),
 			LOCAL_BINARY_DOWNLOAD_HTTP_504(
 					"local-binary-download-http-504",
 					"Local instance received HTTP status 504 trying to download the binary resource from the target"
@@ -729,6 +761,10 @@ public enum Concept
 					"remote-binary-download-http-502",
 					"Remote instance received HTTP status 502 trying to download the binary resource from this server"
 			),
+			REMOTE_BINARY_DOWNLOAD_HTTP_503(
+					"remote-binary-download-http-503",
+					"Remote instance received HTTP status 503 trying to download the binary resource from this server"
+			),
 			REMOTE_BINARY_DOWNLOAD_HTTP_504(
 					"remote-binary-download-http-504",
 					"Remote instance received HTTP status 504 trying to download the binary resource from this server"
diff --git a/src/main/java/dev/dsf/bpe/service/Cleanup.java b/src/main/java/dev/dsf/bpe/service/Cleanup.java
index b9c64990..8fe60092 100644
--- a/src/main/java/dev/dsf/bpe/service/Cleanup.java
+++ b/src/main/java/dev/dsf/bpe/service/Cleanup.java
@@ -142,6 +142,10 @@ private ProcessError toProcessError(WebApplicationException e, String process)
 					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
 			case 502 -> new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_DELETE_HTTP_502,
 					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+			case 503 -> new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_DELETE_HTTP_503,
+					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+			case 504 -> new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_DELETE_HTTP_504,
+					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
 			default -> new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_DELETE_HTTP_UNEXPECTED,
 					null);
 		};
diff --git a/src/main/java/dev/dsf/bpe/service/GenerateAndStoreResource.java b/src/main/java/dev/dsf/bpe/service/GenerateAndStoreResource.java
index ebf39e90..c7168a38 100644
--- a/src/main/java/dev/dsf/bpe/service/GenerateAndStoreResource.java
+++ b/src/main/java/dev/dsf/bpe/service/GenerateAndStoreResource.java
@@ -111,6 +111,12 @@ public void doExecuteWithErrorHandling(DelegateExecution delegateExecution, Vari
 					errorRemote = new ProcessError(process, CodeSystem.DsfPingError.Concept.REMOTE_BINARY_POST_HTTP_502,
 							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
 					break;
+				case 503:
+					error = new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_POST_HTTP_503,
+							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+					errorRemote = new ProcessError(process, CodeSystem.DsfPingError.Concept.REMOTE_BINARY_POST_HTTP_503,
+							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+					break;
 				case 504:
 					error = new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_POST_HTTP_504,
 							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
diff --git a/src/main/java/dev/dsf/bpe/service/ping/CheckPingTaskStatus.java b/src/main/java/dev/dsf/bpe/service/ping/CheckPingTaskStatus.java
index 6dc55e8f..c4031823 100644
--- a/src/main/java/dev/dsf/bpe/service/ping/CheckPingTaskStatus.java
+++ b/src/main/java/dev/dsf/bpe/service/ping/CheckPingTaskStatus.java
@@ -97,6 +97,12 @@ private static ProcessError getProcessError(WebApplicationException e)
 			case 502 -> new ProcessError(ConstantsPing.PROCESS_NAME_PING,
 					CodeSystem.DsfPingError.Concept.RESPONSE_MESSAGE_TIMEOUT_HTTP_502,
 					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+			case 503 -> new ProcessError(ConstantsPing.PROCESS_NAME_PING,
+					CodeSystem.DsfPingError.Concept.RESPONSE_MESSAGE_TIMEOUT_HTTP_503,
+					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+			case 504 -> new ProcessError(ConstantsPing.PROCESS_NAME_PING,
+					CodeSystem.DsfPingError.Concept.RESPONSE_MESSAGE_TIMEOUT_HTTP_504,
+					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
 			default -> new ProcessError(ConstantsPing.PROCESS_NAME_PING,
 					CodeSystem.DsfPingError.Concept.RESPONSE_MESSAGE_TIMEOUT_HTTP_UNEXPECTED,
 					ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
diff --git a/src/main/java/dev/dsf/bpe/util/BinaryResourceDownloader.java b/src/main/java/dev/dsf/bpe/util/BinaryResourceDownloader.java
index 5777d4ad..c40fd9c6 100644
--- a/src/main/java/dev/dsf/bpe/util/BinaryResourceDownloader.java
+++ b/src/main/java/dev/dsf/bpe/util/BinaryResourceDownloader.java
@@ -127,6 +127,13 @@ public DownloadResult download(Variables variables, ProcessPluginApi api, Task t
 							CodeSystem.DsfPingError.Concept.REMOTE_BINARY_DOWNLOAD_HTTP_502,
 							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
 					break;
+				case 503:
+					error = new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_DOWNLOAD_HTTP_503,
+							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+					errorRemote = new ProcessError(process,
+							CodeSystem.DsfPingError.Concept.REMOTE_BINARY_DOWNLOAD_HTTP_503,
+							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
+					break;
 				case 504:
 					error = new ProcessError(process, CodeSystem.DsfPingError.Concept.LOCAL_BINARY_DOWNLOAD_HTTP_504,
 							ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP);
diff --git a/src/main/java/dev/dsf/bpe/util/task/SendTaskErrorConverter.java b/src/main/java/dev/dsf/bpe/util/task/SendTaskErrorConverter.java
index 0fac4f4d..41b84a99 100644
--- a/src/main/java/dev/dsf/bpe/util/task/SendTaskErrorConverter.java
+++ b/src/main/java/dev/dsf/bpe/util/task/SendTaskErrorConverter.java
@@ -314,6 +314,11 @@ yield new ProcessErrorWithStatusCode(
 									CodeSystem.DsfPingError.Concept.SEND_MESSAGE_HTTP_502,
 									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
 							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
+					case 503 -> new ProcessErrorWithStatusCode(
+							new ProcessError(ConstantsPing.PROCESS_NAME_PING,
+									CodeSystem.DsfPingError.Concept.SEND_MESSAGE_HTTP_503,
+									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
+							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
 					case 504 -> new ProcessErrorWithStatusCode(
 							new ProcessError(ConstantsPing.PROCESS_NAME_PING,
 									CodeSystem.DsfPingError.Concept.SEND_MESSAGE_HTTP_504,
@@ -359,6 +364,11 @@ yield new ProcessErrorWithStatusCode(
 									CodeSystem.DsfPingError.Concept.RECEIVE_MESSAGE_HTTP_502,
 									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
 							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
+					case 503 -> new ProcessErrorWithStatusCode(
+							new ProcessError(ConstantsPing.PROCESS_NAME_PING,
+									CodeSystem.DsfPingError.Concept.RECEIVE_MESSAGE_HTTP_503,
+									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
+							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
 					case 504 -> new ProcessErrorWithStatusCode(
 							new ProcessError(ConstantsPing.PROCESS_NAME_PING,
 									CodeSystem.DsfPingError.Concept.RECEIVE_MESSAGE_HTTP_504,
@@ -397,6 +407,11 @@ else if (ConstantsPing.PROCESS_NAME_PONG.equals(process))
 									CodeSystem.DsfPingError.Concept.SEND_MESSAGE_HTTP_502,
 									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
 							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
+					case 503 -> new ProcessErrorWithStatusCode(
+							new ProcessError(ConstantsPing.PROCESS_NAME_PONG,
+									CodeSystem.DsfPingError.Concept.SEND_MESSAGE_HTTP_503,
+									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
+							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
 					case 504 -> new ProcessErrorWithStatusCode(
 							new ProcessError(ConstantsPing.PROCESS_NAME_PONG,
 									CodeSystem.DsfPingError.Concept.SEND_MESSAGE_HTTP_504,
@@ -429,6 +444,11 @@ else if (ConstantsPing.PROCESS_NAME_PONG.equals(process))
 									CodeSystem.DsfPingError.Concept.RECEIVE_MESSAGE_HTTP_502,
 									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
 							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
+					case 503 -> new ProcessErrorWithStatusCode(
+							new ProcessError(ConstantsPing.PROCESS_NAME_PONG,
+									CodeSystem.DsfPingError.Concept.RECEIVE_MESSAGE_HTTP_503,
+									ConstantsPing.POTENTIAL_FIX_URL_ERROR_HTTP),
+							CodeSystem.DsfPingStatus.Code.NOT_REACHABLE);
 					case 504 -> new ProcessErrorWithStatusCode(
 							new ProcessError(ConstantsPing.PROCESS_NAME_PONG,
 									CodeSystem.DsfPingError.Concept.RECEIVE_MESSAGE_HTTP_504,
diff --git a/src/main/resources/fhir/CodeSystem/dsf-ping-error.xml b/src/main/resources/fhir/CodeSystem/dsf-ping-error.xml
index db18184a..93913e74 100644
--- a/src/main/resources/fhir/CodeSystem/dsf-ping-error.xml
+++ b/src/main/resources/fhir/CodeSystem/dsf-ping-error.xml
@@ -41,6 +41,10 @@
         <code value="send-message-http-502"/>
         <display value="Sending a message to the remote instance resulted in HTTP status 502"/>
     </concept>
+    <concept>
+        <code value="send-message-http-503"/>
+        <display value="Sending a message to the remote instance resulted in HTTP status 503"/>
+    </concept>
     <concept>
         <code value="send-message-http-504"/>
         <display value="Sending a message to the remote instance resulted in HTTP status 504"/>
@@ -87,6 +91,10 @@
         <code value="receive-message-http-502"/>
         <display value="Received a message and responded with HTTP status 502"/>
     </concept>
+    <concept>
+        <code value="receive-message-http-503"/>
+        <display value="Received a message and responded with HTTP status 503"/>
+    </concept>
     <concept>
         <code value="receive-message-http-504"/>
         <display value="Received a message and responded with HTTP status 504"/>
@@ -140,6 +148,10 @@
         <code value="local-binary-delete-http-502"/>
         <display value="Local instance encountered a HTTP status 502 trying to clean up the binary resource"/>
     </concept>
+    <concept>
+        <code value="local-binary-delete-http-503"/>
+        <display value="Local instance encountered a HTTP status 503 trying to clean up the binary resource"/>
+    </concept>
     <concept>
         <code value="local-binary-delete-http-504"/>
         <display value="Local instance encountered a HTTP status 504 trying to clean up the binary resource"/>
@@ -177,6 +189,10 @@
         <code value="remote-binary-delete-http-502"/>
         <display value="Remote instance encountered a HTTP status 502 trying to clean up the binary resource"/>
     </concept>
+    <concept>
+        <code value="remote-binary-delete-http-503"/>
+        <display value="Remote instance encountered a HTTP status 503 trying to clean up the binary resource"/>
+    </concept>
     <concept>
         <code value="remote-binary-delete-http-504"/>
         <display value="Remote instance encountered a HTTP status 504 trying to clean up the binary resource"/>
@@ -206,6 +222,10 @@
         <code value="local-binary-post-http-502"/>
         <display value="Local instance encountered a HTTP status 502 trying to post the binary resource to its own FHIR server"/>
     </concept>
+    <concept>
+        <code value="local-binary-post-http-503"/>
+        <display value="Local instance encountered a HTTP status 503 trying to post the binary resource to its own FHIR server"/>
+    </concept>
     <concept>
         <code value="local-binary-post-http-504"/>
         <display value="Local instance encountered a HTTP status 504 trying to post the binary resource to its own FHIR server"/>
@@ -247,6 +267,10 @@
         <code value="remote-binary-post-http-502"/>
         <display value="Remote instance encountered a HTTP status 502 trying to post the binary resource to its own FHIR server"/>
     </concept>
+    <concept>
+        <code value="remote-binary-post-http-503"/>
+        <display value="Remote instance encountered a HTTP status 503 trying to post the binary resource to its own FHIR server"/>
+    </concept>
     <concept>
         <code value="remote-binary-post-http-504"/>
         <display value="Remote instance encountered a HTTP status 504 trying to post the binary resource to its own FHIR server"/>
@@ -305,6 +329,10 @@
         <code value="response-message-timeout-http-502"/>
         <display value="Response message timed out. Received HTTP status 502 trying to check request status on the target"/>
     </concept>
+    <concept>
+        <code value="response-message-timeout-http-503"/>
+        <display value="Response message timed out. Received HTTP status 503 trying to check request status on the target"/>
+    </concept>
     <concept>
         <code value="response-message-timeout-http-504"/>
         <display value="Response message timed out. Received HTTP status 504 trying to check request status on the target"/>
@@ -339,6 +367,10 @@
         <code value="local-binary-download-http-502"/>
         <display value="Local instance received HTTP status 502 trying to download the binary resource from the target"/>
     </concept>
+    <concept>
+        <code value="local-binary-download-http-503"/>
+        <display value="Local instance received HTTP status 503 trying to download the binary resource from the target"/>
+    </concept>
     <concept>
         <code value="local-binary-download-http-504"/>
         <display value="Local instance received HTTP status 504 trying to download the binary resource from the target"/>
@@ -384,6 +416,10 @@
         <code value="remote-binary-download-http-502"/>
         <display value="Remote instance received HTTP status 502 trying to download the binary resource from this server"/>
     </concept>
+    <concept>
+        <code value="remote-binary-download-http-503"/>
+        <display value="Remote instance received HTTP status 503 trying to download the binary resource from this server"/>
+    </concept>
     <concept>
         <code value="remote-binary-download-http-504"/>
         <display value="Remote instance received HTTP status 504 trying to download the binary resource from this server"/>