Does your heater have apush button switch or toggle type. Either way if you push in button type and it won't stay in then switch is bad. Will heater come on if you push switch on and hold it? There should be a small red light on top and fan inside of heater. Do they work? If it was me and I really thought that switch was bad I would remove back and wire around switch. If you don't feel comftortable doing this then you are probable better off just getting a new heater. If you do decide to try wiring around switch make sure heater is unplugged and try to trace wires to switch. If it's just a simple on off switch there should be two wires going to it. Disconnect them from switch and temporarily connect together.Plug heater back in and if it works you know switch is bad. Remember if you don't feel comfortable doing this then don't do it. Most of these small electric heaters are available for around twenty dollars,so I wouldn't spend much time or money trying to fix this one.Hope this help some. Thanks