Dryer thermal fuse opens a safety circuit after over-temperature. Related symptoms include no heat, no start or shutdown after overheating. Those symptoms do not prove the component failed: inspect vent airflow and installation before blaming the fuse. Check the airflow at the outside hood and the vent run before replacing anything.
What this covers
- electric and gas dryers
What it does not cover
Differential
Likely causes of “Dryer thermal fuse”, and how to tell them apart
- 1
A restricted vent overheated the dryer
What separates it The dryer went from working to no heat or no start, and the exhaust is packed with lint or crushed.
How to confirm Check the airflow at the outside hood and the vent run before replacing anything.
- 2
The vent installation is wrong or too long
What separates it The dryer has never dried well and the duct is long, has many bends or is flexible plastic.
How to confirm Check the length and the material of the vent against the manual.
- 3
The dryer has no power at all
What separates it The controls are dead and the breaker or a fuse has tripped or blown, and the plug is loose.
How to confirm Check the breaker, the plug and the outlet before anything else.
- 4
The thermal fuse has blown
What separates it There is no heat or no start, the vent is clear and the fuse tests open with a meter.
How to confirm A fuse blows once for a reason, so find and fix the cause before replacing it.
Before you touch a setting
Record this first — changing settings destroys the evidence
- The symptom, whether the drum turns and the airflow at the outside hood.
- The vent's length, material and condition.
- Whether the dryer overheated or smelled hot before the failure.
Try in this order
0 of 2 completedTest before you replace
ReversibleInspect vent airflow and installation before blaming the fuse.
Weigh the repair
ReversibleReplacement difficulty for the dryer thermal fuse is moderate; the overheating cause must also be corrected.
Stop boundary
When this stops being a self-service repair
- !Do not bypass a thermal fuse; it prevents a fire when the dryer overheats.
- !Replacement is a moderate job with the power disconnected; if the cause is the vent, fix that first.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why does my dryer fuse keep blowing?+
Because something makes the dryer overheat, most often a restricted vent. Replacing the fuse without clearing the vent only gives a new fuse that blows.
What does the thermal fuse do?+
It is a one-time safety device that cuts power to the heat circuit if the dryer overheats, often from a clogged vent.
Can it be reset?+
No, it must be replaced, but the vent cause must be fixed first or it will blow again.
How do I check it?+
With the power off, a multimeter shows whether it has continuity. A failed fuse shows none.