The HVAC guys came and diagnosed my heater issue, which turned out to be an electrical issue with my breaker panel. The electrical guys came out and after confirming the diagnosis did a great job replacing my old outdated and rusted out breaker panel with a new one that is up to code and can be repaired more easily (parts were not available for my old one). No sooner did the power come back on then my heater fan kicked back on, so they did a good job correctly diagnosing the problem - no additional repairs were needed. It was really nice not to have to go back and forth between companies to get this diagnosed and fixed. I'm very happy with my new breaker panel as well