If your space heater makes a clicking noise, it may indicate normal operation as it expands and contracts, but persistent clicking could signal a malfunction or loose component, necessitating inspection or servicing for safety.
That persistent clicking sound from your space heater isn’t just annoying – it could signal anything from harmless thermal expansion to serious mechanical issues. Let’s decode what those noises mean.
Common Causes of Space Heater Clicking
Thermal Expansion (Normal Operation)
Metal components expand when heated and contract when cooled. Oil-filled radiators like DeLonghi models frequently make these sounds. The clicking typically occurs:
- During initial warm-up (15-30 minutes)
- When maintaining temperature
- During cool-down periods
Thermostat Engagement
Most electric heaters click when the thermostat cycles. This normal sound differs from problematic clicking:
| Normal Thermostat Click | Problematic Clicking |
|---|---|
| Single, distinct sound | Rapid, repetitive noises |
| Occurs at temperature thresholds | Persists continuously |
Fan Blade Issues
Forced-air heaters may click if:
- Debris hits the fan blades
- Bearings are worn (often accompanied by squealing)
- The fan motor is failing
When Clicking Signals Trouble
Electrical Arcing
Rapid, irregular clicking could indicate dangerous electrical issues. According to HVAC professionals, this requires immediate attention if accompanied by:
- Burning smells
- Intermittent power loss
- Visible sparks
Mechanical Failure
Oil-filled heaters making new loud clicks may have:
- Oil leaks (check for stains)
- Failed heating elements
- Loose internal components
Solutions for Noisy Heaters
For Oil-Filled Radiators
Try these steps before replacement:
- Place on a perfectly level surface
- Run continuously instead of cycling
- Keep thermostat setting consistent
For Fan-Forced Heaters
If your ceramic or infrared heater clicks:
- Power off and inspect for debris
- Vacuum intake vents
- Check for loose panels
When to Replace Your Heater
Consider a new unit if:
- Clicking persists after troubleshooting
- Noises intensify over time
- Heater is over 5 years old
- Performance declines with noise
For persistent issues with gas heaters, see our guide on gas heater troubleshooting.
