Carrier HVAC Error Codes

11 error codes for Carrier hvac models. Each links to the full diagnostic procedure from the service manual.

CodeDescription
16System communication fault25Invalid motor/model selection26Invalid heater size27Invalid outdoor unit size36Heater output not sensed when energized37Heater output sensed on when not energized41Blower motor fault44Motor communication fault45Control board has failed internal start-up tests and must be replaced.46Brownout condition53Outdoor air temperature sensor fault
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Get the full diagnostic procedure for any Carrier hvac error code.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts
  • Verified part numbers when replacement is required
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