Fan auto mode doesn't work

[Sentriquil]

Please help,

The system I turn to heat and Fan in auto but doesn't run as all. My central heat got 5 wires and I replaced Hunter thermostatic I did connected Green to G, Red to RC, Blue to RH, yellow Y/O, White to W/B; Y1 is none. I checked RC is continuous with other 3 wires but not RH, and RH couldn't continuous anything wires as all. Voltage is blue RH is 8 volt, RC is 16.

------------------------------------- Thank You; sentriquil

[.p.jm.]

you wanna take this one, Steve ? :-)

[Steve]

Pass.....your turn this time Paul :-)

[Stormin Mormon]

Another clueless from Sucko dot com?

[Real Pisser]