Hf-0022 heater tipped over and shut off automatically, which is good, but now, a few hours later, it won't turn back on Amy

Often, while our heater tower is sitting still and upright, it will suddenly turn off with the indicator lit like it has fallen over. Then later, it may start back up without any change in its orientation. I think the sensor may be broken. Any help? Often, while our heater tower is sitting still and upright, it will suddenly turn off with the indicator lit like it has fallen over. Then later, it may start back up without any change in its orientation. I think the sensor may be broken. Any help?