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Fix a heat tape that will not heat

We'll confirm power and thermostat, check the heating cable for damage, then isolate the cause—or tell you when to call a pro.

Troubleshooting · Home maintenance
15–30 min
What you'll need
  • Screwdriver (to open outlet cover if needed)
  • Replacement heat tape (if damage is found)
Step 1 of 5

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Steps

Goal: Confirm power and thermostat, then inspect the heat tape for damage or incorrect installation.

  • Check that the heat tape is plugged in and the circuit breaker and GFCI have not tripped.
  • Good: Power is on. Proceed to Check thermostat.
  • Bad: Breaker or GFCI trips again—call a pro.

Check power

Goal: Rule out power loss and thermostat behavior.

  • Confirm the heat tape thermostat activates only when the pipe is cold (below ~38°F). When the air is warm, the tape will not heat—that is normal. Test by pouring cold water on the thermostat area.
  • Good: Tape warms when the pipe is cold. Proceed to Inspect heat tape.
  • Bad: Tape does not warm when the pipe is cold—may have failed.

Inspect heat tape

Goal: Look for damage, overlap, or incorrect installation.

  • Inspect the tape for cuts, burns, or exposed wire. Confirm there is no overlap—heat tape must not cross over itself.
  • Good: Tape is intact and installed correctly. The system is working.
  • Bad: Damage or overlap—unplug, replace, or call a pro. Do not repair damaged heat tape.

When to get help

Call an electrician if:

  • The breaker or GFCI trips when the heat tape runs.
  • The tape shows burns, cuts, or exposed wire.
  • You are not comfortable with electrical work.
  • The tape is in a hard-to-reach location.

Verification

  • The heat tape is plugged in and the breaker and GFCI are on.
  • The tape warms when the pipe is cold.
  • No damage, overlap, or exposed wire.
  • The pipe does not freeze when the tape is running.

Escalation ladder

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

  1. Confirm power Check plug, outlet, breaker, and GFCI.
  2. Check thermostat Confirm the tape activates when the pipe is cold.
  3. Inspect tape Look for damage, overlap, or incorrect installation.
  4. Call a pro Breaker trips, damaged tape, or electrical concerns—call an electrician.

What to capture if you need help

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

  • Whether power is on and breaker/GFCI has not tripped
  • Thermostat behavior when pipe is cold
  • Any visible damage or overlap
  • Steps already tried

Is the heat tape plugged in and the breaker on?

Heat tape needs power. A tripped breaker or GFCI prevents it from heating.

Check the plug, outlet, circuit breaker, and GFCI. Reset if tripped. Good: power on. Bad: breaker or GFCI trips again—possible short; call a pro.

Yes No

You can change your answer later.

Is the pipe cold? (Heat tape turns on only when cold)

Most heat tape has a thermostat that activates only when the pipe is below ~38°F.

Confirm the pipe is cold. Heat tape will not warm when the air is warm. Pour cold water on the thermostat area to test. Good: tape warms when pipe is cold. Bad: tape does not warm when pipe is cold—may have failed.

Yes No

You can change your answer later.

Is the heat tape intact with no damage or overlap?

Damage or [overlap](#term-overlap) can prevent heating or cause a short.

Inspect the heat tape. Look for cuts, burns, exposed wire, or overlap. Good: tape intact, no overlap. Bad: damage or overlap—unplug, replace, or call a pro.

Yes No

You can change your answer later.

Heat tape working

The heat tape is operating. Confirm it warms when the pipe is cold.

Done

Call a professional

Call an electrician if: the breaker or GFCI trips when the heat tape runs, the tape shows damage, or you are not comfortable with electrical work.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would heat tape not heat?
Power loss, tripped breaker, or a thermostat that does not sense cold. Heat tape also fails from age, damage, or incorrect installation (overlapping can overheat and fail). Check power and thermostat first.
Can I fix heat tape myself?
Yes, you can check power, the thermostat, and inspect for damage. Replacing heat tape requires unplugging, removing the old tape, and wrapping the new tape correctly—no overlap. If the breaker trips, call an electrician.
When should I call a professional for heat tape?
Call an electrician if: the breaker trips when the heat tape runs, the tape shows burns or damage, you are not comfortable with electrical work, or the tape is in a hard-to-reach location.

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