diff --git a/src/lib/validation/form/note-countdown-timer.js b/src/lib/validation/form/note-countdown-timer.js
new file mode 100644
index 00000000..bfd1dc27
--- /dev/null
+++ b/src/lib/validation/form/note-countdown-timer.js
@@ -0,0 +1,37 @@
+const semver = require('semver');
+const { getNodes, getBindNodes } = require('../../forms-utils');
+
+const validateNoteCountdownTimer = async ({ xformPath, xmlDoc, apiVersion }) => {
+  if (!apiVersion) {
+    return { errors: [], warnings: [] };
+  }
+  if (semver.lt(apiVersion, '4.7.0')) {
+    return { errors: [], warnings: [] };
+  }
+
+  const bindNodes = getBindNodes(xmlDoc);
+
+  const warnings = getNodes(xmlDoc, '/h:html/h:body//*[@appearance]')
+    .filter(node => node.getAttribute('appearance').match(/(?:^|\s)countdown-timer(?:$|\s)/))
+    .map(node => node.getAttribute('ref'))
+    .filter(ref => {
+      const bind = bindNodes.find(b => b.getAttribute('nodeset') === ref);
+      return bind?.hasAttribute('readonly');
+    })
+    .map(ref => `  - ${ref}`);
+
+  if (warnings.length) {
+    warnings.unshift(
+      `Form at ${xformPath} contains fields with the deprecated countdown-timer note appearance. `
+      + 'Please update the following fields to use trigger fields instead:'
+    );
+  }
+
+  return { errors: [], warnings };
+};
+
+module.exports = {
+  requiresInstance: true,
+  skipFurtherValidation: false,
+  execute: validateNoteCountdownTimer
+};
diff --git a/test/lib/validate-forms.spec.js b/test/lib/validate-forms.spec.js
index b720487d..5a754751 100644
--- a/test/lib/validate-forms.spec.js
+++ b/test/lib/validate-forms.spec.js
@@ -77,6 +77,11 @@ describe('validate-forms', () => {
     expect(noRequiredNotes.requiresInstance).to.equal(false);
     expect(noRequiredNotes.skipFurtherValidation).to.equal(false);
 
+    const noteCountdownTimer = validations.shift();
+    expect(noteCountdownTimer.name).to.equal('note-countdown-timer.js');
+    expect(noteCountdownTimer.requiresInstance).to.equal(true);
+    expect(noteCountdownTimer.skipFurtherValidation).to.equal(false);
+
     expect(validations, 'Update this test if you have added a new form validation.').to.be.empty;
   });
 
diff --git a/test/lib/validation/form/note-countdown-timer.spec.js b/test/lib/validation/form/note-countdown-timer.spec.js
new file mode 100644
index 00000000..12347220
--- /dev/null
+++ b/test/lib/validation/form/note-countdown-timer.spec.js
@@ -0,0 +1,106 @@
+const { expect } = require('chai');
+const { DOMParser } = require('@xmldom/xmldom');
+const noteCountdownTimer = require('../../../../src/lib/validation/form/note-countdown-timer');
+
+const domParser = new DOMParser();
+const xformPath = 'test/form/path.xml';
+
+const getXml = ({ deprecated = false, newStyle = false } = {}) => `
+<?xml version="1.0"?>
+<h:html xmlns="http://www.w3.org/2002/xforms" xmlns:ev="http://www.w3.org/2001/xml-events" xmlns:h="http://www.w3.org/1999/xhtml" xmlns:jr="http://openrosa.org/javarosa" xmlns:orx="http://openrosa.org/xforms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+  <h:head>
+    <model>
+      <instance>
+        <data id="test">
+          ${deprecated ? '<deprecated_timer>15</deprecated_timer>' : ''}
+          ${newStyle ? '<required_timer/>' : ''}
+        </data>
+      </instance>
+      ${deprecated ? '<bind nodeset="/data/deprecated_timer" readonly="true()" type="string"/>' : ''}
+      ${newStyle ? '<bind nodeset="/data/required_timer" type="string" required="true()"/>' : ''}
+    </model>
+  </h:head>
+  <h:body>
+    ${deprecated
+    ? '<input ref="/data/deprecated_timer" appearance="countdown-timer"><label>Deprecated Timer</label></input>' : ''}
+    ${newStyle
+    ? '<trigger ref="/data/required_timer" appearance="countdown-timer"><label>Required Timer</label></trigger>' : ''}
+  </h:body>
+</h:html>`;
+
+const getXmlDoc = (opts) => domParser.parseFromString(getXml(opts), 'text/xml');
+
+const LATEST_VERSION = '999.99.99';
+const ERROR_HEADER = `Form at ${xformPath} contains fields with the deprecated countdown-timer note appearance. `
+  + 'Please update the following fields to use trigger fields instead:';
+
+describe('note-countdown-timer', () => {
+  it('resolves OK when no countdown-timer fields present', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc(), apiVersion: LATEST_VERSION })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).is.empty;
+      });
+  });
+
+  it('returns warning for deprecated countdown-timer note field', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc({ deprecated: true }), apiVersion: LATEST_VERSION })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).to.have.length(2);
+        expect(warnings[0]).to.equal(ERROR_HEADER);
+        expect(warnings[1]).to.equal('  - /data/deprecated_timer');
+      });
+  });
+
+  it('resolves OK for new trigger style countdown-timer', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc({ newStyle: true }), apiVersion: LATEST_VERSION })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).is.empty;
+      });
+  });
+
+  it('returns warning only for deprecated when both deprecated and new style present', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc({ deprecated: true, newStyle: true }), apiVersion: LATEST_VERSION })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).to.have.length(2);
+        expect(warnings[0]).to.equal(ERROR_HEADER);
+        expect(warnings[1]).to.equal('  - /data/deprecated_timer');
+      });
+  });
+
+  it('resolves OK when apiVersion is below 4.7.0', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc({ deprecated: true }), apiVersion: '4.6.0' })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).is.empty;
+      });
+  });
+
+  it('resolves OK when no apiVersion provided', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc({ deprecated: true }) })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).is.empty;
+      });
+  });
+
+  it('returns warning when apiVersion is exactly 4.7.0', () => {
+    return noteCountdownTimer
+      .execute({ xformPath, xmlDoc: getXmlDoc({ deprecated: true }), apiVersion: '4.7.0' })
+      .then(({ errors, warnings }) => {
+        expect(errors).is.empty;
+        expect(warnings).to.have.length(2);
+        expect(warnings[0]).to.equal(ERROR_HEADER);
+        expect(warnings[1]).to.equal('  - /data/deprecated_timer');
+      });
+  });
+});