Carrier 59SC5A Furnace Error Codes

Single Stage Gas Furnace | Control Board: HK42FZ036

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Disclaimer
This information is for reference purposes only and does not guarantee accuracy or completeness. Always consult your owner's manual and a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

All Error Codes

Code Name Severity DIY?
Continuous OFF No Power Critical ✓ Yes →
Continuous ON Normal Standby Info — →
Rapid Flashing Line Voltage Polarity Reversed Critical ✗ Call a pro →
11 No Previous Code Info — →
12 Blower On After Power Up Info — →
13 Limit Circuit Lockout High ✓ Yes →
14 Ignition Lockout High ✓ Yes →
21 Gas Heating Lockout Critical ✗ Call a pro →
22 Abnormal Flame-Proving Signal Critical ✗ Call a pro →
23 Pressure Switch Did Not Open Medium ✗ Call a pro →
24 Secondary Voltage Fuse Is Open High ✗ Call a pro →
31 Pressure Switch Did Not Close or Reopened High ✓ Yes →
33 Limit Circuit Fault High ✓ Yes →
34 Ignition Proving Failure Medium ✓ Yes →
45 Control Circuitry Lockout Critical ✗ Call a pro →

How to Read the Error Code

Each status code is a two digit number with the first digit determined by the number of short flashes and the second digit by the number of long flashes. The amber LED is visible through the viewing window on the furnace door.

About This Model

The Carrier 59SC5A is a single stage gas furnace using the HK42FZ036-series integrated furnace control (IFC) board.