I believe that if the heat is on, the fan will come on automatically when the heat exchanger reaches a certain temp. At least on my American Standard system, this will happen independent of any thermostat setting. If I heat up the furnace and then shut it off, the fan will come back on until the heat exchanger cools down.
Is it this function that you are trying to track?
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rc80 system mode question
what system mode are you using?
one of the stat setting (02, see below) allows you to determine how the fan is controlled. I would like to know what option people are using? I think i am using zero (0) which may be why the fan status HS device is not updating properly.
02 System options
The thermostat can be configured with the following system options:
0 Auto changeover no fan with heat
1 Auto changeover fan on with heat
4 Manual changeover no fan with heat
5 Manual changeover fan on with heat
12 Heat only no fan with heat
13 Heat only fan on with heat
20 Cool only
The default setting is 0.
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