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Carrier · Furnace

11 No previous code

Low severity 59TP6A58SB0A/58SB1A

What the control is telling you

Shown at the end of the stored code history (1 short, 1 long flash). Codes are erased after 72 hours or manually.

Applies to: 59TP6A two-stage variable-speed ECM multipoise condensing gas furnace, all sizes (040-10 to 120-22)

Likely causes

  • No stored faults / end of history list

Test and repair steps

  1. To read history disconnect the R thermostat wire, reset power, set SW1-1 ON. The LED flashes stored codes in order; record them until code 11 flashes, after which the list repeats.
  2. Warning: When holding the blower door switch closed for service, 115-V parts are exposed and live.
  3. To clear history manually with SW1-1 ON, jumper R, W/W1 and Y/Y2 at the same time until code 11 flashes.
  4. Set SW1-1 OFF and reconnect R.
  5. Run the system through low-heat, high-heat and cooling to check operation.

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Source: Carrier 59TP6A Installation, Start-up, Operating and Service Instructions, Fig. 66 Troubleshooting Guide, p.88; p.77. 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.