A dryer that runs but won't heat is one of the most common dryer problems. Here's a systematic guide to diagnosing and potentially fixing it before calling a technician.
Safety First
Before inspecting any dryer component, unplug the dryer from the powerpoint. Never work on a connected appliance.
Common Causes of a Dryer Not Heating
1. Tripped Thermal Fuse (Most Common)
The thermal fuse is a safety device that blows when the dryer overheats. Once blown, it cannot be reset โ it must be replaced. This is the most common cause of a dryer that runs but doesn't heat.
Signs: Dryer tumbles but produces no heat. Fuse location: usually near the heating element housing (gas dryers) or on the exhaust duct (electric dryers).
Fix: Replace the thermal fuse. Parts typically cost $15-$40. The underlying cause (usually a blocked vent causing overheating) must also be addressed.
2. Blocked Exhaust Vent
This is the most common cause of thermal fuse failure. Lint accumulates in the vent duct over time, restricting airflow. Restricted airflow causes overheating, which trips the thermal fuse.
Signs: Clothes take multiple cycles to dry. Dryer feels very hot to the touch. Lint around the external vent opening.
Fix:
- Disconnect the vent duct from the back of the dryer
- Use a vent cleaning brush kit (available from hardware stores) to clean the duct
- Clean the external wall vent flap
- Clean behind and under the dryer
3. Faulty Heating Element (Electric Dryers)
The heating element is a coil of resistance wire that heats the air. If it breaks, the dryer runs cold. Visible damage (broken wire coil) is a clear sign.
Diagnosis: Requires a multimeter to test continuity across the element. Zero continuity = dead element.
Fix: Replace the heating element. Parts cost $40-$120 depending on model. This is a DIY repair for confident home fixers; otherwise call a technician.
4. Faulty Igniter or Gas Valve (Gas Dryers)
For gas dryers, the igniter must glow to light the gas, and the gas valve must open to allow gas flow. Either component failing stops heat generation.
Fix: These repairs require a licenced gas technician in Australia. Do not attempt to repair gas components yourself.
5. Faulty High-Limit Thermostat
The high-limit thermostat is another safety cutoff that stops heating if temperature exceeds a threshold. Unlike the thermal fuse, some thermostats are resettable, though many must be replaced.
Fix: Test with multimeter and replace if faulty. Parts cost $15-$40.
When to Call a Technician
Call a technician when: the repair involves gas components; you're not comfortable with electrical diagnosis; you've replaced the thermal fuse and it blows again (indicating a deeper problem); or the repair cost exceeds 50% of replacement value.
Time for a New Dryer?
If your dryer is old and repair costs are significant, a new or certified refurbished dryer may be more economical. Shop our range at oceaniaappliances.com.au. Free Sydney delivery.