diff --git a/app/src/main/java/ee/ria/DigiDoc/android/Constants.java b/app/src/main/java/ee/ria/DigiDoc/android/Constants.java
index 319c1f75d..5d06aeebc 100644
--- a/app/src/main/java/ee/ria/DigiDoc/android/Constants.java
+++ b/app/src/main/java/ee/ria/DigiDoc/android/Constants.java
@@ -31,6 +31,12 @@ public final class Constants {
      */
     public static final int MAXIMUM_PERSONAL_CODE_LENGTH = 11;
 
+    /**
+     * CAN number
+     */
+
+    public static final int CAN_LENGTH = 6;
+
     /**
      * View type to identify screen when restarting app
      */
diff --git a/app/src/main/java/ee/ria/DigiDoc/android/signature/update/nfc/NFCView.java b/app/src/main/java/ee/ria/DigiDoc/android/signature/update/nfc/NFCView.java
index b5fc2847d..58ea6049c 100644
--- a/app/src/main/java/ee/ria/DigiDoc/android/signature/update/nfc/NFCView.java
+++ b/app/src/main/java/ee/ria/DigiDoc/android/signature/update/nfc/NFCView.java
@@ -1,6 +1,7 @@
 package ee.ria.DigiDoc.android.signature.update.nfc;
 
 import static com.jakewharton.rxbinding4.widget.RxTextView.afterTextChangeEvents;
+import static ee.ria.DigiDoc.android.Constants.CAN_LENGTH;
 import static ee.ria.DigiDoc.android.accessibility.AccessibilityUtils.removeAccessibilityStateChanged;
 import static ee.ria.DigiDoc.common.PinConstants.PIN2_MIN_LENGTH;
 import static ee.ria.DigiDoc.common.PinConstants.PIN_MAX_LENGTH;
@@ -80,13 +81,13 @@ public NFCView(Context context) {
     }
 
     public Observable<Object> positiveButtonState() {
-        return Observable.merge(positiveButtonStateSubject, afterTextChangeEvents(pinView));
+        return Observable.merge(positiveButtonStateSubject, afterTextChangeEvents(canView) , afterTextChangeEvents(pinView));
     }
 
     public boolean positiveButtonEnabled() {
         Editable canText = canView.getText();
         Editable pinText = pinView.getText();
-        return canText != null && canText.length() == 6 && pinText != null && isPinLengthValid(pinText.toString());
+        return canText != null && isCANLengthValid(canText.toString()) && pinText != null && isPinLengthValid(pinText.toString());
     }
 
     @Override
@@ -118,17 +119,29 @@ public void response(@Nullable NFCResponse response, @Nullable RadioGroup method
     }
 
     private void checkInputsValidity() {
-        checkPinCodeValidity();
+        canView.setOnFocusChangeListener((view, hasfocus) -> checkCANCodeValidity());
         pinView.setOnFocusChangeListener((view, hasfocus) -> checkPinCodeValidity());
     }
 
+    private void checkCANCodeValidity() {
+        canLayout.setError(null);
+        Editable canCodeView = canView.getText();
+        if (canCodeView != null && !canCodeView.toString().isEmpty() &&
+                !isCANLengthValid(canCodeView.toString())
+        ) {
+            canLayout.setError(getResources().getString(
+                    R.string.nfc_sign_can_invalid_length,
+                    Integer.toString(CAN_LENGTH)));
+        }
+    }
+
     private void checkPinCodeValidity() {
-        pinLabel.setError(null);
+        pinLayout.setError(null);
         Editable pinCodeView = pinView.getText();
         if (pinCodeView != null && !pinCodeView.toString().isEmpty() &&
                 !isPinLengthValid(pinCodeView.toString())
         ) {
-            pinLabel.setError(getResources().getString(
+            pinLayout.setError(getResources().getString(
                     R.string.id_card_sign_pin_invalid_length,
                     getResources().getString(R.string.signature_id_card_pin2),
                     Integer.toString(PIN2_MIN_LENGTH),
@@ -141,6 +154,10 @@ private boolean isPinLengthValid(String pin) {
                 pin.length() <= PinConstants.PIN_MAX_LENGTH;
     }
 
+    private boolean isCANLengthValid(String can) {
+        return can.length() == CAN_LENGTH;
+    }
+
     private void setAccessibilityDescription() {
         canView.setContentDescription(getResources().getString(R.string.signature_update_nfc_can) + " " +
                 AccessibilityUtils.getTextViewAccessibility(canView));
diff --git a/app/src/main/res/values-et/strings.xml b/app/src/main/res/values-et/strings.xml
index a184dbdf0..58f51cf80 100644
--- a/app/src/main/res/values-et/strings.xml
+++ b/app/src/main/res/values-et/strings.xml
@@ -293,6 +293,7 @@
     <string name="signature_update_id_card_sign_pin2_invalid_final">Vale PIN2. Järgmise vale sisestusega lukustub PIN.</string>
     <string name="signature_update_id_card_sign_pin2_locked">PIN2 on lukus. Mine Minu eID, et avada.</string>
 
+    <string name="nfc_sign_can_invalid_length">CAN-kood peab olema %1$s-kohaline</string>
     <string name="id_card_sign_pin_invalid_length">%1$s-kood peab olema vähemalt %2$s-kohaline ja maksimaalselt %3$s-kohaline</string>
 
     <string name="signature_update_nfc_message">Enter your CAN number and PIN 2 code to sign with ID-Card using NFC</string>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index 9d91fbd7d..014fc8e94 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -295,6 +295,7 @@
     <string name="signature_update_id_card_sign_pin2_invalid_final">Неверный PIN2. У Вас осталась 1 попытка до блокировки Вашего PIN2.</string>
     <string name="signature_update_id_card_sign_pin2_locked">PIN2 заблокирован. Зайдите в Мой eID, чтобы разблокировать его.</string>
 
+    <string name="nfc_sign_can_invalid_length">CAN-код должен состоять из %1$s символов</string>
     <string name="id_card_sign_pin_invalid_length">%1$s-код должен состоять минимум из %2$s и максимум из %3$s символов</string>
 
     <string name="signature_update_nfc_message">Enter your CAN number and PIN 2 code to sign with ID-Card using NFC</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f8ffbbd0b..8ea82eed5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -293,6 +293,7 @@
     <string name="signature_update_id_card_sign_pin2_invalid_final">Wrong PIN2. You have 1 attempt left until your PIN2 is blocked.</string>
     <string name="signature_update_id_card_sign_pin2_locked">PIN2 blocked. Go to My eID to unblock it.</string>
 
+    <string name="nfc_sign_can_invalid_length">CAN-code must be %1$s digits long</string>
     <string name="id_card_sign_pin_invalid_length">%1$s code must be at least %2$s and a maximum of %3$s digits long</string>
 
     <string name="signature_update_nfc_message">Enter your CAN and PIN 2 code to sign with ID-Card using NFC</string>