Baseboard heaters sometimes make clicking sounds. These are caused by the unit's metal reacting to temperature variations: it expands when the heat turns on and contracts when the temperature cools. ... Likewise, you should leave a space of at least 1/8" (3 mm), between molding and baseboard heater sides.

Is it normal for baseboard heaters to make noise?

Baseboard heaters are notorious for emitting different sounds. The clicking and buzzing noises are “normal" in so much that too many of them do it and do it too frequently. ... Noises are caused by the expansion when starting, and the contraction when cooling, of the metal components of the baseboards.

How do you fix a ticking baseboard heater?

Clicking, Ticking or Humming

Also, make sure no furniture or toys are jammed against or in the baseboard. Another solution is to remove the front cover of the baseboard and locate the mounting screws. Loosen each a quarter to half a turn to allow the metal to move more freely.