diff --git a/app/assets/stylesheets/conditions_component.scss b/app/assets/stylesheets/conditions_component.scss
index 152eb8c0a..4633531bd 100644
--- a/app/assets/stylesheets/conditions_component.scss
+++ b/app/assets/stylesheets/conditions_component.scss
@@ -3,6 +3,15 @@
 
 .conditionnel {
 
+  .condition-error {
+    background: $background-red;
+    margin: ($default-spacer) (-$default-spacer);
+
+    ul {
+      padding: $default-spacer;
+    }
+  }
+
   .condition-table {
     table-layout: fixed;
 
diff --git a/app/components/types_de_champ/conditions_component/conditions_component.html.haml b/app/components/types_de_champ/conditions_component/conditions_component.html.haml
index f28edcfc2..871cb2e9b 100644
--- a/app/components/types_de_champ/conditions_component/conditions_component.html.haml
+++ b/app/components/types_de_champ/conditions_component/conditions_component.html.haml
@@ -5,6 +5,8 @@
         %p.mr-2 Logique conditionnelle
         = logic_conditionnel_button
 
+      = render TypesDeChamp::ConditionsErrorsComponent.new(conditions: condition_per_row, upper_tdcs: @upper_tdcs)
+
       - if @condition.present?
         %table.condition-table.mt-2.width-100
           %thead
diff --git a/app/components/types_de_champ/conditions_errors_component.rb b/app/components/types_de_champ/conditions_errors_component.rb
new file mode 100644
index 000000000..c9d706145
--- /dev/null
+++ b/app/components/types_de_champ/conditions_errors_component.rb
@@ -0,0 +1,34 @@
+class TypesDeChamp::ConditionsErrorsComponent < ApplicationComponent
+  def initialize(conditions:, upper_tdcs:)
+    @conditions, @upper_tdcs = conditions, upper_tdcs
+  end
+
+  private
+
+  def errors
+    @conditions
+      .filter { |condition| condition.errors(@upper_tdcs.map(&:stable_id)).present? }
+      .map { |condition| row_error(Logic.split_condition(condition)) }
+      .uniq
+      .map { |message| tag.li(message) }
+      .then { |lis| tag.ul(lis.reduce(&:+)) }
+  end
+
+  def row_error((left, operator_name, right))
+    targeted_champ = @upper_tdcs.find { |tdc| tdc.stable_id == left.stable_id }
+
+    if targeted_champ.nil?
+      "Un champ cible n'est plus disponible. Il est soit supprimé, soit déplacé en dessous de ce champ."
+    elsif left.type == :unmanaged
+      "Le champ « #{targeted_champ.libelle} » de type #{targeted_champ.type_champ} ne peut pas être utilisé comme champ cible."
+    else
+      "Le champ « #{targeted_champ.libelle} » est #{t(left.type, scope: '.type')}. Il ne peut pas être #{t(operator_name, scope: 'logic.operators').downcase} #{right.to_s.downcase}."
+    end
+  end
+
+  def render?
+    @conditions
+      .filter { |condition| condition.errors(@upper_tdcs.map(&:stable_id)).present? }
+      .present?
+  end
+end
diff --git a/app/components/types_de_champ/conditions_errors_component/conditions_errors_component.fr.yml b/app/components/types_de_champ/conditions_errors_component/conditions_errors_component.fr.yml
new file mode 100644
index 000000000..213de5ed8
--- /dev/null
+++ b/app/components/types_de_champ/conditions_errors_component/conditions_errors_component.fr.yml
@@ -0,0 +1,6 @@
+---
+fr:
+  type:
+    number: un nombre
+    string: un texte
+    boolean: soit oui, soit non
diff --git a/app/components/types_de_champ/conditions_errors_component/conditions_errors_component.html.haml b/app/components/types_de_champ/conditions_errors_component/conditions_errors_component.html.haml
new file mode 100644
index 000000000..b0e3dbce7
--- /dev/null
+++ b/app/components/types_de_champ/conditions_errors_component/conditions_errors_component.html.haml
@@ -0,0 +1,2 @@
+.condition-error
+  = errors
diff --git a/spec/components/types_de_champ/conditions_errors_component_spec.rb b/spec/components/types_de_champ/conditions_errors_component_spec.rb
new file mode 100644
index 000000000..4a9bc8532
--- /dev/null
+++ b/spec/components/types_de_champ/conditions_errors_component_spec.rb
@@ -0,0 +1,43 @@
+describe TypesDeChamp::ConditionsErrorsComponent, type: :component do
+  include Logic
+
+  describe 'render' do
+    let(:conditions) { [] }
+    let(:upper_tdcs) { [] }
+
+    before { render_inline(described_class.new(conditions: conditions, upper_tdcs: upper_tdcs)) }
+
+    context 'when there are no condition' do
+      it { expect(page).to have_no_css('.condition-error') }
+    end
+
+    context 'when the targeted_champ is not available' do
+      let(:tdc) { create(:type_de_champ_integer_number) }
+      let(:conditions) { [ds_eq(champ_value(tdc.stable_id), constant(1))] }
+
+      it do
+        expect(page).to have_css('.condition-error')
+        expect(page).to have_content("Un champ cible n'est plus disponible")
+      end
+    end
+
+    context 'when the targeted_champ is unmanaged' do
+      let(:tdc) { create(:type_de_champ_address) }
+      let(:upper_tdcs) { [tdc] }
+      let(:conditions) { [ds_eq(champ_value(tdc.stable_id), constant(1))] }
+
+      it do
+        expect(page).to have_css('.condition-error')
+        expect(page).to have_content("ne peut pas être utilisé")
+      end
+    end
+
+    context 'when the types mismatch' do
+      let(:tdc) { create(:type_de_champ_integer_number) }
+      let(:upper_tdcs) { [tdc] }
+      let(:conditions) { [ds_eq(champ_value(tdc.stable_id), constant('a'))] }
+
+      it { expect(page).to have_content("Il ne peut pas être") }
+    end
+  end
+end