Baseboard heater making a clicking noise

Symptoms

• Clicking or ticking sound as the heater heats up or cools down
• May happen at the start and end of each cycle
• Heater otherwise works and produces heat normally

Likely causes

• CommonNormal thermal expansion of the metal housing and finsMetal expands and contracts with temperature changes, causing small clicks.
• PossibleThermostat cycling on and off rapidlyA miscalibrated or failing thermostat can cause frequent on/off clicking beyond normal expansion.
• PossibleLoose internal component vibratingA loose bracket or element mount can add extra rattling to normal expansion sounds.
• Less commonDust or debris inside the unitBuildup can occasionally cause minor ticking as it heats.

What to do

1. Listen for the pattern: a few clicks right when it starts and stops heating is normal thermal expansion.
2. If clicking is rapid and repeated throughout the cycle, check the thermostat setting and consider it may be cycling too often.
3. Turn off the breaker and gently check that the cover and internal brackets are secure, not loose or rattling.
4. Vacuum dust from the fins with the heater off and cool, using a soft brush attachment.
5. If clicking is just occasional expansion noise with steady heat output, no repair is needed.
6. If it's paired with short cycling or inconsistent heat, have an electrician check the thermostat.

Tools and parts

• Vacuum with brush attachment

When to call a pro

Call an electrician if clicking is paired with short cycling or uneven heat, suggesting a thermostat problem.

Safety