My cadet baseboard heater has begun to make a loud clanging/grinding noise upon startup. It gradually subsides to a gurgling and then quiet until the thermostat kicks it on again. It sounds like metal on metal, like a fan blade coming into contact with metal. Thanks in advance!

Exact model number of baseboard heater?

I don't know the model number, but it is the SoftHeat kind. I hope that is enough to go on. Thanks!

Found the model number: EBHA750W