Electric Thermostat
Does anyone know why the thermostat to an electric heater would buzz?

I live in an apartment that appears to have been made from a converted house. There is a separate electric radiator for each room, and therefore a separate thermostat for each. There are two thermostats now that I have caught making a buzzing noise... one in the bathroom and one in the bedroom. It isn't an electrical-short, spark kind of noise... it's almost like the buzz of the dryer when it finishes, only a very quiet version of the noise. And it doesn't do it in a predictable pattern, it's pretty sporadic, and usually does a few short buzzes in a row and then stops.

Ideas?
It is not an electrical spark noise... I've heard that before and this noise is completely different. I am already planning on telling the landlord about it but I wanted to get some ideas as to what it was.

You're playing with fire here. The best option is to let your landlord know that an electrician--not a handyman--is needed to evaluate the situation.

Electrical fires are the worst because they break out in several places at once and come out from the walls and outlets. I would turn them all off until you can be sure there is no problem, which means a report from a qualified electrician at the very least, and an inspection by the local government zoning board at the most.