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Fix a heated driveway that will not melt snow

We'll check the thermostat, snow sensor, circuit breaker, and heating cables—or tell you when to call a pro for embedded cable repair.

Troubleshooting · Home appliances
15–45 min
What you'll need
  • Multimeter (for continuity tests)
  • Screwdriver set (Phillips and flathead)
  • Replacement controller (if tests show a fault)
Step 1 of 6

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Steps

Goal: Confirm the controller is set to heat, rule out power, then isolate the fault.

  • Set the controller to Heat or On. If the system has a snow sensor, confirm it is active and not blocked.
  • Good: The controller is set to heat but the driveway stays cold—fault in the system. Proceed to Check controller and power.
  • Bad: The controller was off or the snow sensor was blocked—adjust and retest.

Check controller and power

Goal: Rule out controller settings and power loss before opening the controller.

  • Verify the controller mode is set to Heat or On. For manual systems, turn on when snow is expected. For automatic systems, confirm the snow sensor is clear.
  • Check the circuit breaker for the driveway heat. Reset if tripped. If it trips again when the system runs, call an electrician.
  • Good: Controller is set to heat and the breaker is on. Proceed to Check snow sensor and heating cables.
  • Bad: Breaker keeps tripping—fix that first, or call a pro.

Check snow sensor and heating cables

Goal: Test the snow sensor and heating cables.

  • Check the snow sensor. Verify it is not covered by snow, ice, or debris. Clean if needed. Check the controller for a sensor fault indicator.
  • Test the controller for continuity with a multimeter when set to heat. Replace if it fails.
  • Test the heating cables for continuity. If no continuity and the cables are embedded, call a pro—repair requires cutting the driveway.
  • Good: You found and replaced the faulty part. The driveway should melt snow when the system runs.
  • Bad: All parts test good but the driveway still does not melt snow—call a technician.

When to get help

Call an electrician if:

  • The breaker trips when you reset it.
  • You see damaged or exposed wiring.
  • The heating cables are embedded and you cannot access them.
  • You have replaced the controller and it still does not melt snow.

Do not work on live circuits.

Verification

  • The driveway heats and melts snow when the controller is on and snow is present.
  • No error codes on the controller display.
  • The controller and snow sensor (if present) are functioning correctly.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Controller and power Confirm controller is set to heat; check circuit breaker.
  2. Snow sensor Check that the snow sensor is clear and active.
  3. Controller continuity Test controller for continuity; replace if faulty.
  4. Heating cables Test heating cables for continuity; call a pro if embedded.
  5. Call a pro Breaker trips, damaged wiring, embedded cables, or parts replaced and still no melt.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Controller model and any error codes
  • Circuit breaker status
  • Snow sensor status
  • Controller and cable continuity test results
  • Steps already tried

Is the controller set to heat and the breaker on?

Check the controller mode and the circuit breaker for the driveway heat.

Set the controller to Heat or On. Check the breaker in the electrical panel. Reset if tripped. Good: controller at heat and breaker on. Bad: breaker trips again—fault exists; call an electrician.

Yes No

You can change your answer later.

Is the snow sensor clear and active?

Systems with automatic activation need a clear snow sensor.

Check the snow sensor. Verify it is not covered by snow, ice, or debris. Clean if needed. Check the controller for a sensor fault. Good: sensor clear and active. Bad: sensor blocked or faulty—clean or replace.

Yes No

You can change your answer later.

Does the controller have continuity when set to heat?

Test the controller for continuity. A faulty controller can prevent heat.

Turn off power. Disconnect heating cable wires. Set controller to heat. Test for continuity between load terminals. No continuity: controller failed—replace with matching model. Continuity: controller good—proceed to heating cables.

Yes (good) No (failed)

You can change your answer later.

Replace controller and test

Replace the controller with a matching model. Restore power and set to heat. Wait for snow or test with a cold surface. The driveway should melt snow if the controller was the only fault.

Done

Do the heating cables have continuity?

Test the heating cables. A break in the circuit stops heating. Embedded cables require a pro.

With power off, test the heating cables for continuity. No continuity: cables failed. If embedded, call a pro; repair requires cutting the driveway. Continuity: cables good—check for error codes or call a technician.
Question

Do the heating cables have continuity?

Done

Call a technician

Call an electrician if: the breaker trips when you reset it; you see damaged or exposed wiring; the heating cables are embedded and you cannot access them; or you have replaced the controller and it still does not melt snow.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a heated driveway not melt snow?
Common causes: thermostat or controller set to off, tripped circuit breaker, faulty snow sensor, damaged heating cables, or controller failure. Check thermostat and power first, then the snow sensor.
Can I fix a heated driveway that will not melt snow myself?
Yes, for thermostat settings, circuit breaker, and snow sensor checks. You can test and replace the controller or thermostat if accessible. Repairing damaged cables embedded in concrete or asphalt requires a professional.
When should I call a technician for a heated driveway?
Call an electrician if the breaker trips when you reset it, you see damaged or exposed wiring, the heating cables are embedded and you cannot access them, or you have replaced the controller and it still does not melt snow.

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