Goodman Furnace: Control display blank, furnace dead – Goodman/Amana 9-speed ECM furnaces
Control display blank, furnace dead - Goodman/Amana 9-speed ECM furnaces on a Goodman furnace: The furnace does nothing and the 7-segment display on the integrated control module shows nothing (the troubleshooting chart lists this as LED status 'None').
Applies to: Goodman/Amana/GMC gas furnaces, 9-speed ECM, 7-segment control. Two-stage 96%: AC9C96, AM9C96, GC9C96, GM9C96. Single stage 80%: VC9S80, VM9S80, AC9S80, AM9S80, GC9S80, GM9S80. Single stage 92/96%: VC9S96, VM9S96, AC9S96, AM9S96, AM9S92, GC9S96, GM9S96, GM9S92
Common causes of control display blank, furnace dead - goodman/amana 9-speed ecm furnaces
- No 115 V power to the furnace or no 24 V to the control
- Blown fuse or tripped breaker
- Failed integrated control module
How to fix control display blank, furnace dead - goodman/amana 9-speed ecm furnaces: step by step
- WARNING: line voltage present - measure carefully.
- Check that 115 VAC power reaches the furnace: breaker, service switch and the blower door interlock switch (door must be closed or the switch held in).
- Measure 115 VAC at the control board line terminals and 24 VAC at the transformer secondary.
- If 24 VAC is present at the transformer but missing at R-C, the board fuse is open - find and fix the low-voltage short, then replace the fuse.
- Correct whatever tripped the breaker or blew the fuse before resetting.
- Power and fuse good but still no display: replace the integrated control module.
- Note: opening the blower door without holding the door switch closed clears the stored fault - read the fault history (L6F) through the sight glass first.
If the unit shows an error code, look it up: Goodman Furnace codes
Models
Goodman/Amana GM9C96/AM9C96
AC9C96AM9C96AM9C960303ANGC9C96GM9C96GM9C960303AN
Goodman/Amana GM9S80/AM9S80
AC9S800403ANAC9S800603ANAC9S800804BNAC9S800805CNAC9S801005CNAM9S800403ANAM9S800603ANAM9S800603BNAM9S800604BNAM9S800803BNAM9S800804BNAM9S800804CNAM9S800805CNAM9S801005CNAM9S801205DNGC9S800403ANGC9S800603ANGC9S800804BNGC9S800805CNGC9S801005CNGM9S800403ANGM9S800603ANGM9S800603BNGM9S800604BNGM9S800803BNGM9S800804BNGM9S800804CNGM9S800805CNGM9S801005CNGM9S801205DN
Goodman/Amana GM9S96/AM9S96
AC9S960403BNAC9S960603BNAC9S960804CNAC9S961005CNAC9S961205CNAC9S961205DNAM9S920403ANAM9S920603BNAM9S920803BNAM9S920804CNAM9S920805CNAM9S921004CNAM9S921005CNAM9S921205DNAM9S960403ANAM9S960603BNAM9S960803BNAM9S960804CNAM9S960805CNAM9S961004CNAM9S961005CNAM9S961205DNGC9S960403BNGC9S960603BNGC9S960804CNGC9S961005CNGC9S961205CNGC9S961205DNGM9S920403ANGM9S920603BNGM9S920803BNGM9S920804CNGM9S920805CNGM9S921004CNGM9S921005CNGM9S921205DNGM9S960403ANGM9S960603BNGM9S960803BNGM9S960804CNGM9S960805CNGM9S961004CNGM9S961005CNGM9S961205DN
Source: Goodman RS6612022r1 (GM9S92/GM9S96/GC9S96 service), 1 Stage Troubleshooting Codes, p.29-30; Goodman RS6621008r2 (GM9S80 service), p.32-33; Goodman RS6612020r1 (GM9C96 service), 2 Stage Troubleshooting Codes, p.35-36; Checking Integrated Ignition Control Boards p.25 (RS6612022r1). Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.