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Carrier 59SC6A error codes

Every checked code for the Carrier 59SC6A range, with what it means and whether you can fix it yourself.

Error codes

Code Meaning What you can do
10.1 Line voltage polarity reversed Call a pro
13.1 Limit circuit lockout, a limit or rollout switch stayed open Safe checks first, then a pro
14.1 Ignition lockout after repeated failed lighting attempts Safe checks first, then a pro
14.2 Flame lost 3 times after 70 seconds of heating Safe checks first, then a pro
14.3 Lockout after 7 flame losses in one heat request Safe checks first, then a pro
21.1 24 volts sensed at the gas valve when there should be none Safe checks first, then a pro
22.1 Flame proved while the gas valve is off Safe checks first, then a pro
23.1 Flue or venting fault (depends on model) Call a pro
23.2 Secondary pressure switch stuck closed Call a pro
24.1 Fuse fault, short in the 24-volt wiring Call a pro
25.1 Control has no program loaded Call a pro
25.2 Control program file is corrupted Call a pro
25.3 Twinned furnaces are not identical Call a pro
25.4 Main program invalid, running on the backup program Call a pro
25.5 Installer settings are corrupted Call a pro
25.6 Wrong program loaded for this control Call a pro
25.7 Non-condensing program in a condensing furnace Call a pro
27.1 Program in super plug is missing or corrupted Call a pro
27.2 Program in super plug is missing or corrupted Call a pro
27.3 Program in super plug is missing or corrupted Call a pro
31.2 Flue or venting fault (depends on model) Depends on your model
31.3 Secondary pressure switch lockout after 3 failed trials Safe checks first, then a pro
32.1 Main pressure switch (LPS) open Safe checks first, then a pro
33.1 Limit circuit switch open, blower running to cool the furnace Safe checks first, then a pro
34.1 Ignition fault, burners did not light in 4 trials Safe checks first, then a pro
34.2 Flame lost before the heating blower started Safe checks first, then a pro
34.3 Flame lost after the heating blower started Safe checks first, then a pro
45.1 Internal control fault Call a pro
45.2 Gas valve relay will not close Call a pro
45.3 Control memory (EEPROM) fault Call a pro
46.1 Momentary loss of power Call a pro

Models in this range