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Old 11-02-2010, 12:00 PM   #1
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Intertherm Oil Furnace

In following the directions for for the seasonal firing up. They say to place a jumper on terminals FF. When doing this the furnace fires just fin and will stay lit for as long as the jumper is on. I suspect this is a thermostat by-pass. When I try to use the thermostat the furnace does not start thr furnace. I suspect the thermostat which is older then the furnace is malfunctioning.


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Old 11-02-2010, 07:32 PM   #2
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FF stands for Flame Failure. When you jump it out. You are bypassing the flame failure safety.

Generally, that is only done when bleeding the pump. And should not be done any other time.

Your thermostat connects to the TT terminals. Which stands for thermostat.

So are you pressing the reset button, and then jumping the FF terminals.


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