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Carrier and Bryant Furnace LED off: Status LED off (no power to control)

Updated October 2026 · Sourced from Carrier and Bryant documentation

🧭 Check a few things first

The status LED is continuously off. The service label says to check for 115VAC at L1 and L2 and 24VAC at SEC-1 and SEC-2.

Is it safe to keep running? Check the steps below first. If the LED stays off with power on, call a licensed technician. Voltage checks at the control and transformer are electrical service work.

LED off at a glance

Code / how it showsMeaningApplies to
LED off
Status LED is continuously off
Status LED off (no power to control)Carrier 59SC5A single-stage 4-way multipoise condensing gas furnace (Series 1 and 2)

Check this first

Only steps a homeowner can do safely. Do not open electrical panels or the burner area.

  1. Make sure the furnace power switch is on and the breaker has not tripped.
  2. Make sure the blower door is fully in place and latched, because the furnace will not run with the door switch open.
  3. Check the thermostat is set to Heat, set above room temperature, and has fresh batteries if it uses them.

🛑 Stop and call a licensed pro if

  • If the LED stays off with power on, call a licensed technician. Voltage checks at the control and transformer are electrical service work.
  • You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
  • Flame rollout, limit or pressure switch codes that come back after one reset.
  • Anything involving the control board, gas valve, flame sensor, igniter or venting.
  • A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.

Safe first steps for any Carrier and Bryant code

  1. Count the LED flashes through the blower door window before you switch anything off. Cutting power can clear the code.
  2. Replace or clean the furnace air filter.
  3. Check the thermostat: correct mode, set above room temperature, and fresh batteries.
  4. Make sure the furnace power switch and breaker are on. If the furnace has locked out, turning the power off and back on once restarts it.
  5. Make sure the gas valve is in the ON position, following the lighting instructions on the furnace label only.
  6. On high-efficiency furnaces, look at the outside vent and intake pipes for snow, ice, leaves or nests (look only, do not take pipes apart).

Source: Carrier 59SC5A Installation, Start-up, Operating and Service and Maintenance Instructions, Fig. 62 Service Label, p.67. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.

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Related Carrier and Bryant codes

LED on : Status LED steady on (normal)Rapid flashing : Rapid flashing LED (reversed polarity)11 : No previous fault code stored12 : Blower on after power up13 : Limit circuit lockout14 : Ignition lockout21 : Gas heating lockout22 : Abnormal flame-proving signal23 : Pressure switch did not open24 : Secondary voltage fuse is open31 : Pressure switch did not close or reopened33 : Limit circuit fault (limit or rollout switch open)

All 21 Carrier and Bryant codes and series →

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