Rheem RGPH-05 eauer gas heater
My rheem natural gas heater, RGPH-05 EAUER, manufactured in 1997, located in my basement. Last night I noticed it humming from the blower compartment. The blower wasn't moving. I tried taking the door off which breaks the power. I left it off for about an hour, put it back on. It sounded like it was going to start, then stopped again and started humming.
Do I need to call an HVAC technician or is this something I can troubleshoot and fix? I have the installation instructions, and "users information manual"
I appreciate any help or advice.