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Furnace fan (blower) will not shut off


dj1100rt

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Posted

I have a Heil, gas, condensor furnace. The blower stays on forever after a heat cycle. Model #NUGK100DH3. Unit is a 1989 model.  I replaced the fan relay today and the problem persists.  I have the same problem after an air conditioning, cooling cycle: the fan stays on all day long after a cooling cycle.

What's a good next move?

Thanks,

Dave

  • Replies 4
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  • Last Reply
Posted

Is there a FAN/AUTO Switch on the Thermostat ?

How's the Control, fan and limit # 16 (top right side)

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Posted

The fan auto switch is set to auto.  Is there a test for the fan limit/control?  I have an ohm meter.

Posted

 

This Fan and Limit Control has a 6 wire hook-up

2 wires are the Fan Switch,

2 wires are the Limit Switch

and the other two wires are the Time Delay side of the Switch.

 

 

Posted

If the unit is off and the furnace is cold then the  FAN portion of that FAN/LIMIT should have no continuity. The dial that goes around as the bi-metal heats up may be stuck in the on position.

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