HVACopedia

Carrier · Furnace

25.1 No program in control

High severity 59SC6A

What the control is telling you

The control has no model program information loaded; gas heat will not run.

Applies to: Carrier 59SC6A

Likely causes

  • Blank or unprogrammed replacement control
  • Lost program data

Test and repair steps

  1. Read the Model Program Number from the furnace rating plate.
  2. Reprogram the control with that number using the supported mobile app over NFC (remove 115-V power from the board first) or the correct super plug.
  3. Never load a program number different from the rating plate; parameter options will not match design values.
  4. Check the inF menu shows the right program number and software version.
  5. If the code remains after reprogramming, replace the control and program the new one.
  6. Run a full heat cycle to confirm.

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Source: Carrier 59SC6A Installation, Start-up, Operating and Service Instructions, Fig. 60 Service Label Information, p.54; Control Board Replacement p.53. Summarized in our own words; check the original manual for your model.

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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.