Winter winds are howling outside your door. As you step out of your warm bed, you realize that the air inside your home isn't as warm as it should be. Clearly, something has gone wrong with your geothermal heating system. Before you let panic take over, it's important to realize that the lack of heat doesn't necessarily mean that your geothermal system has suffered a catastrophic failure. In fact, the problem with your system may only require some simple troubleshooting.