My lakewood heater runs a few minutes then the buzzer goes off, like it is tipped over. It is NOT tipped. What's up with that?

SOURCE: my lakewood oil filled heater model 5600/7 just

The reason that it stopped is an open circuit. It is probably a blown thermal fuse. However, it could be any of the following if that is not the problem:

bad switch, broken or disconnected wire, burned open heater element, bad connections between terminals and wires, or between wire connectors and the wires within them.

If you take it apart, you will find the heat sensitive thermal fuse device under the heating elements, near the bottom of the unit. If the thermal fuse is good, it will appear as a short to an ohmmeter (zero ohms). If it is failed, it will appear as an open (infinite ohms).

The thermal fuse device can be replaced. Here is where to get one:
http://www.goodmans.net/get_list_632_2.htm

The thermal fuse may be this one, but check the temperature indication on yours first: Item#: TH-TF167C

Good luck.

SOURCE: find tip-over switch on Lakewood Heater

lakewood makes several styles of heaters,if it is the steam looking version,i don't think it has a tip over switch,because it cant start a fire...the tip over switch version has the counter balance switch in the casing under the coil and fan area..to check to see if it is working ,just turn it on and tip it over ,try it a couple of directions,if it shuts off it works.its not a thermocouple...