what brand furnace is it? pilot or dsi (direct spark ignition)
will the fan start - blow cold, or nothing
on any one...fan controled by t-stat. common issue is the TWO contact points
1, the temp points, 2, the on off switch. If the fan won't start you can just jump the two wires together, to bypass t-stat. also one of them should have 12 vdc
the fan must start to control the heat, a sail swicth moves with enough air flow ( low battery voltage protection ) then 12vdc goes thru a high temp limet switch to pcb or pilot / main gas valve
wayne
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Wayne & Sandy
1981 19.5 SB Sunline
1987 C 851 Sunline
1997 E-150 4.2 v6
1976 F-150 4.9 I6
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