Model #GD100M16B THERMAL ZONE Furnace/Heater, Gas

  • 90+ Downflow Furnace
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Question and Answers


What does the double flash mean on the circuit board. GD100M16B Thermal Zone Residential gas furnace


Thank you for choosing Sears Parts Direct. I can certainly understand how frustrating it can be when your Furnace is not working properly. I did look into the model number you have provided and I have found some basic information that will assist you.  I did look into the model number and I do show that the Owner’s Manual is no longer available due to the age of the unit. We do have limited information on your unit. What color is the double flash light?

If the light is red and blinking twice it means that the pressure switch is stuck open. Click here for the information and steps. Let me know if this helps.


Thank you for your question., Have a great day.

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Natasha12 -
Sears Technician
November 18, 2013