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Configuration error: gas furnace codes by brand

A setting, dip switch or installation parameter is wrong for the connected equipment.

Brand Code Meaning What you can do
Carrier 25 Model plug missing or wrong, or a setup switch error Call a pro
Carrier 25.1 Control has no program loaded Call a pro
Carrier 25.2 Control program file is corrupted Call a pro
Carrier 25.3 Twinned furnaces are not identical Call a pro
Carrier 25.4 Main program invalid, running on the backup program Call a pro
Carrier 25.5 Installer settings are corrupted Call a pro
Carrier 25.6 Wrong program loaded for this control Call a pro
Carrier 25.7 Non-condensing program in a condensing furnace Call a pro
Carrier 27.1 Program in super plug is missing or corrupted Call a pro
Carrier 27.2 Program in super plug is missing or corrupted Call a pro
Carrier 27.3 Program in super plug is missing or corrupted Call a pro
Goodman b2 Blower motor size does not match the shared data Call a pro
Carrier btL Firmware failed to load Call a pro
Goodman d0 No shared data loaded on the control board Call a pro
Goodman d4 Invalid memory card data Call a pro
Goodman Eb2 Blower motor size does not match the shared data Call a pro
Goodman Ed0 No shared data loaded on the control board Call a pro
Goodman Ed1 Invalid shared data Call a pro
Goodman Ed8 Invalid call, outdoor unit setting does not match Call a pro
Goodman EEH Twinning error Call a pro
Goodman 3 amber flashes Second-stage heat call without first stage Safe checks first, then a pro
Goodman 4 amber flashes Cooling call without a fan signal Safe checks first, then a pro
Goodman 9 red flashes Configuration error or electrical fault (depends on model) Call a pro
Goodman red light flashing rapidly Electrical fault or configuration error (depends on model) Call a pro