Goodman PGB furnace: inducer switch stuck closed.

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Old 01-18-19, 08:00 AM
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Goodman PGB furnace: inducer switch stuck closed.

My end switch gets stuck closed keeping the furnice from starting. I can smack it to make it pop open then it will work until it gets stuck again between heating cycles. Where id the vent switch. Is it attached to the inducer blower? Can the vent switch be replaced or will the whole inducer blower need to be replaced?
 
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Old 01-18-19, 08:25 AM
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I think your talking about the pressure switch. There should be a tube connected to the inducer that connects to the pressure switch.
 
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Old 01-18-19, 09:22 AM
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Not sure I have not opened it up. My boards LED flashes 3 times which says the venter end switch is stuck closed and to check it.
 
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Old 01-18-19, 09:26 AM
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Old 01-18-19, 12:42 PM
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What is the furnace model number? Should be inside the burner section.
 
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Old 01-18-19, 01:04 PM
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Am at work will have to check when I get home. I found in my manual that “A centrifugal switch is built into the induced draft blower...” so I guess that means I have to replace the blower.
 
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Old 01-18-19, 01:23 PM
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That what I was wondering. Be sure and check for any blockage in the pipes first. The switch just might be doing it's job.
 
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Old 01-18-19, 06:13 PM
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PGB is an outdoor packaged unit. That uses that type of inducer switching since there is basically nothing to plug. It's only a short run between the inducer and outside. That is centrifugal type switch and is probably getting stuck from corrosion.

PGB generic manual (pdf)
 
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Old 01-19-19, 12:06 PM
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I opened the housing on the draft inducer blower for the centrifugal switch. There is a N.C. Micro switch which is depressed by a white plunger when the blower is off. The force from the blower backs the the plunger off the switch. There was some adjustment nuts so I moved the switch a little bit closer as the plunger wasn’t making complete contact every time the blower stopped. Seems to be working great now.
 
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Old 01-19-19, 12:08 PM
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Good job. Thanks for letting us know what you found.
 
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Old 03-06-19, 08:56 AM
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I'm having the same problem. Mine doesn't have a pressure switch as well. If I unplug one side of the limit switch, the inducer fan will come on. If I go ahead and plug the limit switch back in the unit runs fine until it needs to call for heat again. Anyone know what it could be? Board? Motor?
 
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