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Hvac Pro
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23,688 Posts
If the pilot is stuck on then either the gas valve pilot valve is stuck open which is very rare ( never seen it) or you are getting 24 volts from the S86 to the PV terminal on the valve. Pull the PV wire off the valve and see if the pilot goes out and check it for 24 volts to C.

If it stays on the the valve is bad.
 

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Hvac Pro
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23,688 Posts
Yeah I don't see many older units with the S86 anymore other than the Lennox Whisperheat. After 20-25 yrs most furnaces get replaced where I am.
 
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