Model #GMPN100-4 GOODMAN Furnace/Heater, Gas

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Question and Answers

Q:

Ac works fine but furnace won't fire. GMPN100-4

Q:

Furnace won't light GMPN100-4 Goodman Gas furnace

A:

Hello glad to help.  Thank You for choosing Sears PartsDirect.com
 
I am sorry and do understand your frustration when having trouble with the furnace.

Glad to help out.   Im  looking at your Goodman Gas Furnace model number gmpn100-4.
 
When a light blinks 4 blinks it says an open limit switch.  Check main limit open and Auxillary limit open.
 
 
 
 If you have further questions please let me know.
Thanks for choosing Sears PartsDirect.com

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Larry L -
Sears Technician
November 14, 2013
A:

Thanks for the information about your furnace model   GMPN100-4, sorry you are having a problem, I will be glad to assist you. When the board blinks four times this indicated there is an open limit switch you should check the max, limit switch and the aux. limit switch.  Wiring and diagnostic chart is normally located on the access panel back side. _Always disconnect power supply before servicing the appliance and when testing live voltage be sure to wear proper safety equipment (gloves and eye protection) also be aware of sharp metals on product_After working on any gas appliance every component must be inspected for gas leaking before restarting the appliance. If you do not have the proper testing equipment and are not experienced in electrical component testing it is strongly suggested that you call for an experienced technician to service your product. Here is a link to Sears Home Services.  Ron H.

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Ron H -
Sears Technician
November 18, 2013
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