Here is the manual for the GR9S96 and the GD9S96 model furnace.

SERVICE TIPS:

• Errors will Have "EE" or "E" in the display. For example "EE2" or "EEJ".

• Heating Mode Speed Selection: The manual states you need to get to the "gA1" option in the menu to change the speeds. This is actually incorrect and you will be looking for the "gAF" menu option.

• The code " IDL " or if you are reading board upside down," 7P1 " is strictly saying that the furnace is idle with no call. This is not a fault code.
• If you are getting the inducer relay fault, EEJ or EEj, you will first want to verify grounding. This is the number one issue. Another thing we have seen is outside electrical issues. It could be a pump or some of appliance on the same leg of the furnace. We have also seen where the insulation on the incoming wire was rubbed off and would arc every once in awhile and kill the inducer relay  because it was the weakest circuit in the house. If you have changed a board due to this, be sure to check all the other items we listed before putting on another.
• If you are installing furnace in a non-A2L or R410a setting then you need to shut off the sensor. Otherwise, you will get the blower to come on and the board will Flash "F09" and "EAF" and it will not do anything but that. See article/video here

This article is for the following models:

• Base Model: GR9S960403AN

  • Revision: GR9S960403ANAA

• Base Model: GR9S960403BU

  • Revision: GR9S960403BUAA

• Base Model: GR9S960603BN

  • Revision: GR9S960603BNAA

• Base Model: GR9S960603BU

  • Revision: GR9S960603BUAA

• Base Model: GR9S960803BN

  • Revision: GR9S960803BNAA

• Base Model: GR9S960804CN

  • Revision: GR9S960804CNAA

• Base Model: GR9S960805CN

  • Revision: GR9S960805CNAA

• Base Model: GR9S960805CU

  • Revision: GR9S960805CUAA

• Base Model: GR9S961005CN

  • Revision: GR9S961005CNAA

• Base Model: GR9S961205DN

  • Revision: GR9S961205DNAA

• Base Model: GD9S800403AN

  • Revision: GD9S800403ANAA

• Base Model: GD9S800403AX

  • Revision: GD9S800403AXAA

• Base Model: GD9S800603AN

  • Revision: GD9S800603ANAA

• Base Model: GD9S800603AX

  • Revision: GD9S800603AXAA

• Base Model: GD9S800804BN

  • Revision: GD9S800804BNAA

• Base Model: GD9S800804BX

  • Revision: GD9S800804BXAA

• Base Model: GD9S800805CX

  • Revision: GD9S800805CXAA

• Base Model: GD9S801005CN

  • Revision: GD9S801005CNAA

• Base Model: GD9S801005CX

  • Revision: GD9S801005CXAA

• Base Model: GD9S960403BN

  • Revision: GD9S960403BNAA

  • Revision: GD9S960403BNAB

• Base Model: GD9S960603BN

  • Revision: GD9S960603BNAA

• Base Model: GD9S960804CN

  • Revision: GD9S960804CNAA

• Base Model: GD9S961005CN

  • Revision: GD9S961005CNAA

• Base Model: GD9S961205DN

  • Revision: GD9S961205DNAA

Here is the video if you are going to use a non-A2L refrigerant system. This shuts off the sensor.