Carrier · Error codes
Carrier furnace error codes
Codes are grouped by the controller that displays them, because the same number can mean different things on different Carrier generations. Read the full model number on the rating plate before trusting any code page.
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Carrier 59SC6A Comfort 96 furnaces with the on-board 3-digit display control
- Code 2323.1: Stuck closed Main pressure switch · 23.2: Stuck closed secondary pressure switchLED: 2 short, 3 long
- Code 2424.1: Fuse faultLED: 2 short, 4 long
- Code 2525.1: No program info in micro, no heating operation. · 25.2: Corrupted program file, reprogram control using service app or super plug (supplied separately), no heating operation. · 25.3: Twinned units are not identical, program #'s do not match. Ensure furnaces are identical (same program #) when twinning. Main unit will not operate in heating. · 25.4: Main program invalid, using backup program to operate. Reprogram control to correct issue. Control still operates normally. · 25.5: Installer settings corrupted. Try reselecting installer settings, or reprogram control. Control will operate using default installer settings. · 25.6: Wrong program for control used - reprogram control so program matches control used. No heating operation. · 25.7: Non-Condensing program detected in a Condensing model.LED: 2 short, 5 long
- Code 2727.1: Program in super plug is missing, not recognized, or corrupted. Remove super plug then retry. · 27.2: If still have 27 code, try a different super plug. · 27.3: If still fails, replace control.LED: 2 short, 7 long
- Code 3131.2: Open secondary pressure switch (HPS) · 31.3: Secondary PS Lockout - failed to close secondary PS after three trialsLED: 3 short, 1 long
- Code 3232.1: Open Main pressure switch (LPS)LED: 3 short, 2 long
- Code 3333.1: A switch has opened in the Main Limit circuitLED: 3 short, 3 long
- Code 3434.1: Ignition fault - during four consecutive ignition trials. · 34.2: After successful ignition (flame proven) flame loss before heating blower on delay. · 34.3: After successful ignition (flame proven) flame loss after heating blower on delay.LED: 3 short, 4 long
- Code 4545.1: Control failure - flame circuit fault, memory mismatch or sequence error · 45.2: Control failure - gas valve relay will not close · 45.3: Control failure - EEPROM memory issueLED: 4 short, 5 long
- Code 4646.1: Momentary loss of powerLED: 4 short, 6 long
- Code 1010.1: Rapid flash LED L1 polarity faultLED: 1 short, 0 long
- Code 1212.1: W on at power upLED: 1 short, 2 long
- Code 1313.1: Limit Lockout - switch open longer than 3 minutes in Main Limit circuit · 13.2: Ignition Lockout after 4 consecutive ignition triesLED: 1 short, 3 long
- Code 1414.2: Flame lost 3 times after 70s of heating · 14.3: Lockout - 7 loss of flame events during a heat requestLED: 1 short, 4 long
- Code 2121.1: 24VAC sensed on gas valve when shouldn't beLED: 2 short, 1 long
- Code 2222.1: False flameLED: 2 short, 2 long
Carrier 59TP6C Performance 96 furnaces with the on-board 3-digit display control
- Code 3131.6: Open secondary pressure switch (HPS) · 31.7: High Heat Only for next cycle – HPS failed to close in 75s when transitioning from low to high heatLED: 3 short, 1 long
- Code 1010.1: Rapid flash - L1 polarity faultLED: 1 short, 0 long
- Code 1212.1: W on at power upLED: 1 short, 2 long
- Code 1313.1: Limit Lockout - switch open longer than 3 minutes in Main Limit circuit · 13.2: Ignition Lockout after 4 consecutive ignition triesLED: 1 short, 3 long
- Code 1414.2: Flame lost 3 times after 70s of heating · 14.3: Lockout - 7 loss of flame events during a heat request · 14.4: Lockout - 7 LPS open events during a heat requestLED: 1 short, 4 long
- Code 1515.1: Lockout - no Blower rpms detectedLED: 1 short, 5 long
- Code 1919.1: InteliSense™ communications lossLED: 1 short, 9 long
- Code 2121.1: 24VAC sensed on gas valve when shouldn't beLED: 2 short, 1 long
- Code 2222.1: False flameLED: 2 short, 2 long
- Code 2323.4: LPS stuck closed · 23.5: HPS stuck closedLED: 2 short, 3 long
- Code 2424.1: Fuse faultLED: 2 short, 4 long
- Code 2525.1: No program info in micro, no heating operation. · 25.2: Corrupted program file, reprogram control using service app or super plug (supplied separately), no heating operation. · 25.3: Twinned units are not identical, program #'s do not match. Ensure furnaces are identical (same program #) when twinning. Main unit will not operate in heating. · 25.4: Main program invalid, using backup program to operate. Reprogram control to correct issue. Control still operates normally. · 25.5: Installer settings corrupted. Try reselecting installer settings, or reprogram control. Control will operate using default installer settings. · 25.6: Wrong program for control used - reprogram control so program matches control used. No heating operation. · 25.7: If program in furnace control is missing, not recognized, or corrupted. Reprogram control with correct program # as listed on the rating plate. Replace control if issue remains.LED: 2 short, 5 long
- Code 2727.1: Program in super plug is missing, not recognized, or corrupted. Remove super plug then retry. · 27.2: If still have 27 code, try a different super plug. · 27.3: If still fails, replace control.LED: 2 short, 7 long
- Code 3232.2: Open Main pressure switch (LPS)LED: 3 short, 2 long
- Code 3333.1: A switch has opened in the Main Limit circuit · 33.2: Lockout - High Heat Only for current cycle · 33.3: Ignition fault - during four consecutive ignition trialsLED: 3 short, 3 long
- Code 3434.5: Low heat flame lost before on-delay · 34.6: Low heat flame lost after on-delay · 34.7: High heat flame lost before on-delay · 34.8: High heat flame lost after on-delayLED: 3 short, 4 long
- Code 4141.1: No blower RPM at start up · 41.2: No RPM when blower motor is runningLED: 4 short, 1 long
- Code 4343.1: HPS closed before LPSLED: 4 short, 3 long
- Code 4545.1: Internal control error · 45.2: GVR relay not closing · 45.3: Micro EEPROM error · 45.4: Micro loss of CommLED: 4 short, 5 long
- Code 4646.1: Momentary loss of powerLED: 4 short, 6 long
- Code 5252.1: SAT - Open · 52.2: SAT - ShortLED: 5 short, 2 long
- Code 5353.1: RAT - Open · 53.2: RAT - ShortLED: 5 short, 3 long
Carrier 59TP7A Performance 97 furnaces with the on-board 3-digit display control
- Code 3131.6: Open secondary pressure switch (HPS) · 31.7: High Heat Only for next cycle – HPS failed to close in 75s when transitioning from low to high heatLED: 3 short, 1 long
- Code 1010.1: Rapid flash - L1 polarity faultLED: 1 short, 0 long
- Code 1212.1: W on at power upLED: 1 short, 2 long
- Code 1313.1: Limit Lockout - switch open longer than 3 minutes in Main Limit circuit · 13.2: Ignition Lockout after 4 consecutive ignition triesLED: 1 short, 3 long
- Code 1414.2: Flame lost 3 times after 70s of heating · 14.3: Lockout - 7 loss of flame events during a heat request · 14.4: Lockout - 7 LPS open events during a heat requestLED: 1 short, 4 long
- Code 1515.1: Lockout - no Blower rpms detectedLED: 1 short, 5 long
- Code 1919.1: InteliSense™ communications lossLED: 1 short, 9 long
- Code 2121.1: 24VAC sensed on gas valve when shouldn't beLED: 2 short, 1 long
- Code 2222.1: False flameLED: 2 short, 2 long
- Code 2323.4: LPS stuck closed · 23.5: HPS stuck closedLED: 2 short, 3 long
- Code 2424.1: Fuse faultLED: 2 short, 4 long
- Code 2525.1: No program info in micro, no heating operation. · 25.2: Corrupted program file, reprogram control using service app or super plug (supplied separately), no heating operation. · 25.3: Twinned units are not identical, program #'s do not match. Ensure furnaces are identical (same program #) when twinning. Main unit will not operate in heating. · 25.4: Main program invalid, using backup program to operate. Reprogram control to correct issue. Control still operates normally. · 25.5: Installer settings corrupted. Try reselecting installer settings, or reprogram control. Control will operate using default installer settings. · 25.6: Wrong program for control used - reprogram control so program matches control used. No heating operation. · 25.7: If program in furnace control is missing, not recognized, or corrupted. Reprogram control with correct program # as listed on the rating plate. Replace control if issue remains.LED: 2 short, 5 long
- Code 2727.1: Program in super plug is missing, not recognized, or corrupted. Remove super plug then retry. · 27.2: If still have 27 code, try a different super plug. · 27.3: If still fails, replace control.LED: 2 short, 7 long
- Code 3232.2: Open Main pressure switch (LPS)LED: 3 short, 2 long
- Code 3333.1: A switch has opened in the Main Limit circuit · 33.2: Lockout - High Heat Only for current cycle · 33.3: Ignition fault - during four consecutive ignition trialsLED: 3 short, 3 long
- Code 3434.5: Low heat flame lost before on-delay · 34.6: Low heat flame lost after on-delay · 34.7: High heat flame lost before on-delay · 34.8: High heat flame lost after on-delayLED: 3 short, 4 long
- Code 4141.1: No blower RPM at start up · 41.2: No RPM when blower motor is runningLED: 4 short, 1 long
- Code 4343.1: HPS closed before LPSLED: 4 short, 3 long
- Code 4545.1: Internal control error · 45.2: GVR relay not closing · 45.3: Micro EEPROM error · 45.4: Micro loss of CommLED: 4 short, 5 long
- Code 4646.1: Momentary loss of powerLED: 4 short, 6 long
- Code 5252.1: SAT - Open · 52.2: SAT - ShortLED: 5 short, 2 long
- Code 5353.1: RAT - Open · 53.2: RAT - ShortLED: 5 short, 3 long
Carrier 59SP6B Performance 96 single-stage furnaces with the on-board 3-digit display control
- Code 2323.1: Stuck closed Main pressure switch · 23.2: Stuck closed secondary pressure switchLED: 2 short, 3 long
- Code 2424.1: Fuse faultLED: 2 short, 4 long
- Code 2525.1: No program info in micro, no heating operation. · 25.2: Corrupted program file, reprogram control using service app or super plug (supplied separately), no heating operation. · 25.3: Twinned units are not identical, program #'s do not match. Ensure furnaces are identical (same program #) when twinning. Main unit will not operate in heating. · 25.4: Main program invalid, using backup program to operate. Reprogram control to correct issue. Control still operates normally. · 25.5: Installer settings corrupted. Try reselecting installer settings, or reprogram control. Control will operate using default installer settings. · 25.6: Wrong program for control used - reprogram control so program matches control used. No heating operation. · 25.7: Non-Condensing program detected in a Condensing model.LED: 2 short, 5 long
- Code 2727.1: Program in super plug is missing, not recognized, or corrupted. Remove super plug then retry. · 27.2: If still have 27 code, try a different super plug. · 27.3: If still fails, replace control.LED: 2 short, 7 long
- Code 3131.2: Open secondary pressure switch (HPS) · 31.3: Secondary PS Lockout - failed to close secondary PS after three trialsLED: 3 short, 1 long
- Code 3232.1: Open Main pressure switch (LPS)LED: 3 short, 2 long
- Code 3333.1: A switch has opened in the Main Limit circuitLED: 3 short, 3 long
- Code 3434.1: Ignition fault - during four consecutive ignition trials. · 34.2: After successful ignition (flame proven) flame loss before heating blower on delay. · 34.3: After successful ignition (flame proven) flame loss after heating blower on delay.LED: 3 short, 4 long
- Code 4545.1: Control failure - flame circuit fault, memory mismatch or sequence error · 45.2: Control failure - gas valve relay will not close · 45.3: Control failure - EEPROM memory issueLED: 4 short, 5 long
- Code 4646.1: Momentary loss of powerLED: 4 short, 6 long
- Code 1010.1: Rapid flash LED L1 polarity faultLED: 1 short, 0 long
- Code 1212.1: W on at power upLED: 1 short, 2 long
- Code 1313.1: Limit Lockout - switch open longer than 3 minutes in Main Limit circuit · 13.2: Ignition Lockout after 4 consecutive ignition triesLED: 1 short, 3 long
- Code 1414.2: Flame lost 3 times after 70s of heating · 14.3: Lockout - 7 loss of flame events during a heat requestLED: 1 short, 4 long
- Code 2121.1: 24VAC sensed on gas valve when shouldn't beLED: 2 short, 1 long
- Code 2222.1: False flameLED: 2 short, 2 long
- Code 1515.1: Lockout - no Blower rpms detectedLED: 1 short, 5 long
- Code 1919.1: InteliSense™ communications lossLED: 1 short, 9 long
- Code 4141.1: No blower RPM at start up · 41.2: No RPM when blower motor is runningLED: 4 short, 1 long
- Code 5252.1: SAT - Open · 52.2: SAT - ShortLED: 5 short, 2 long
- Code 5353.1: RAT - Open · 53.2: RAT - ShortLED: 5 short, 3 long
Carrier 59TN7A Infinity 97 furnaces with the on-board 3-digit display control
- Code 3131.6: Open secondary pressure switch (HPS) · 31.7: High Heat Only for next cycle – HPS failed to close in 75s when transitioning from low to high heatLED: 3 short, 1 long
- Code 1010.1: Rapid flash - L1 polarity faultLED: 1 short, 0 long
- Code 1212.1: W on at power upLED: 1 short, 2 long
- Code 1313.1: Limit Lockout - switch open longer than 3 minutes in Main Limit circuit · 13.2: Ignition Lockout after 4 consecutive ignition triesLED: 1 short, 3 long
- Code 1414.2: Flame lost 3 times after 70s of heating · 14.3: Lockout - 7 loss of flame events during a heat request · 14.4: Lockout - 7 pressure switch open events during a heat requestLED: 1 short, 4 long
- Code 2121.1: 24VAC sensed on gas valve when shouldn't be, power reset onlyLED: 2 short, 1 long
- Code 2222.1: False flameLED: 2 short, 2 long
- Code 2323.4: LPS stuck closed · 23.5: HPS stuck closedLED: 2 short, 3 long
- Code 2424.1: Fuse faultLED: 2 short, 4 long
- Code 2525.1: No program. · 25.2: Corrupted program file, reprogram control. · 25.4: Main program invalid, using backup program to operate. · 25.5: Installer settings corrupted. · 25.6: Wrong program, reprogram control. · 25.7: If program in furnace control is missing, not recognized, or corrupted. Reprogram control with correct program # as listed on the rating plate. Replace control if issue remains.LED: 2 short, 5 long
- Code 2727.1: Program in super plug is missing, not recognized, or corrupted. Remove super plug then retry. · 27.2: If still have 27 code, try a different super plug. · 27.3: If still fails, replace control.LED: 2 short, 7 long
- Code 3232.2: Open Main pressure switch (LPS)LED: 3 short, 2 long
- Code 4343.1: HPS closed before LPSLED: 4 short, 3 long
- Code 4545.1: Internal control error · 45.2: GVR relay not closing · 45.3: Micro EEPROM error · 45.4: Micro loss of CommLED: 4 short, 5 long
- Code 5252.1: SAT - Open · 52.2: SAT - ShortLED: 5 short, 2 long
- Code 5353.1: RAT - Open · 53.2: RAT - ShortLED: 5 short, 3 long
- Code 1515.1: Lockout - no Blower rpms detected · 15.2: Lockout - Failed to reach 500rpm during start upLED: 1 short, 5 long
- Code 4141.1: No blower RPM at start up · 41.2: No RPM when blower motor is running · 41.3: Failed to reach 500rpm at startupLED: 4 short, 1 long
- Code 5151.1: OAT - Open · 51.2: OAT - ShortLED: 5 short, 1 long
- Code 3333.1: A switch has opened in the Main Limit circuitLED: 3 short, 3 long
- Code 3434.1: Ignition fault - four consecutive ignition trials. · 34.5: Low heat flame lost before blower on-delay · 34.6: Low heat flame lost after blower on-delay · 34.7: High heat flame lost before blower on-delay · 34.8: High heat flame lost after blower on-delayLED: 3 short, 4 long
Coverage
Only codes verified from Carrier manuals are listed. Missing a code? Call 604-473-9690 with the model number and the code.