Hello,
System is gas heat, no heat pump, air
Trying to install new Hunter 44660 thermostat

Old White Rodgers Wiring
W- white wire
RH RC Jumper on
RC- red wire
B-nothing
C-blue wire
G-green wire
O-nothing
Y-YELLOW

I've wired the new Hunter Thermostat as:
Y1-nothing
RH-RC jumper on
RC- red wire
YO-yellow wire
WB-white wire
G-green wire
The manual says if a C wire was present- do not use it - so I didn't

The thermostat says the fan is running but it isn't. What should I change?
Any help is appreciated.

Start by getting a quality Honeywell/White Rodgers thermostat.
Hunter is junk.

Spot on advice. I took it back. Thanks for taking the time to reply. Much appreciated.

My thoughts exactly,, hvac1000