Carrier 58MVC Furnace Error Codes

Variable Speed Gas Furnace | Control Board: Variable Speed Furnace Control

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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 / Control Failure High ✓ Yes →
Continuous ON Normal Operation - No Call for Heat Info — →
Rapid Flashing Reversed Line Voltage Polarity High ✗ 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 →
15 Blower Motor Lockout High ✗ Call a pro →
21 Gas Heating Lockout High ✗ Call a pro →
22 Abnormal Flame-Proving Signal High ✗ Call a pro →
23 Pressure Switch Did Not Open High ✗ Call a pro →
24 Secondary Voltage Fuse Is Open High ✗ Call a pro →
25 Model Selection or Setup Error Low ✗ Call a pro →
31 Medium-Heat Pressure Switch or HPSR Relay Did Not Close or Reopened High ✗ Call a pro →
32 Low-Heat Pressure Switch Did Not Close or Reopened High ✓ Yes →
33 Limit Circuit Fault High ✓ Yes →
34 Ignition Proving Failure High ✓ Yes →
41 Blower Motor Fault High ✗ Call a pro →
42 Inducer Motor Fault High ✓ Yes →
43 Low-Heat Pressure Switch Open While Medium-Heat Pressure Switch Is Closed High ✓ Yes →
45 Control Circuitry Lockout High ✗ Call a pro →

How to Read the Error Code

Carrier furnaces use a two-digit LED blink code on the control board. An amber LED flashes a short-then-long pattern: count the short flashes for the first digit, then the long flashes for the second digit. For example, three short flashes followed by four long flashes means code 34. The board stores recent fault codes for retrieval.

About This Model

The Carrier 58MVC is a variable speed gas furnace using the Variable Speed Furnace Control control board.