How to Reset a Carrier Furnace and Clear LED Fault Codes

Quick Answer

To reset a Carrier furnace: set the thermostat to OFF, then flip the furnace circuit breaker off for 30 seconds and back on. Carrier furnaces are hardwired and do not have a wall outlet to unplug. Always write down the LED blink code before resetting - the code clears after power is restored. If Code 33 or 34 returns after reset, the underlying issue has not been fixed.

To reset a Carrier furnace, set the thermostat to OFF, wait 30 seconds, then set it back to HEAT. This clears most fault codes including Code 33 and Code 34. For a harder reset, flip the furnace circuit breaker off for 30 seconds. For Code 13 rollout lockout, you must also press the manual reset button on the rollout limit switch inside the cabinet after resolving the root cause. Resetting without fixing the underlying fault will result in the same code returning within one heating cycle.

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Not seeing RESET on your display?

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all carrier furnace LED codes

HUB

pressure switch fault

3 Short 3 Long

flame not detected after ignition

How to Reset Your Carrier Furnace

Set thermostat OFF for 30 seconds then back to HEAT. For Code 13 rollout, also press the physical reset button on the limit switch inside the cabinet. Always fix the root cause first.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Control board stored a fault code and furnace is locked out40%

Thermostat reset needed after temporary fault condition clears24%

Power interruption caused control board to freeze22%

Rollout limit switch manually tripped and requires physical reset14%

Symptoms You May Notice

Furnace not responding to thermostat heat calls
LED on control board showing a repeating fault blink pattern
Furnace was working, tripped a fault code, and now will not restart
Thermostat shows heat call is active but furnace is silent

Tools Required for Diagnosis

Flashlight (to locate rollout switch in cabinet)Screwdriver (to open cabinet door if panel-screw secured)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Note the LED blink pattern before resetting so you can identify

Note the LED blink pattern before resetting so you can identify the fault code. Write down the number of short blinks and long blinks. This tells you what caused the lockout and whether the root cause needs to be fixed before reset will hold.

Perform a soft reset

Perform a hard reset

For Code 13 rollout limit lockout specifically: the control

After a successful reset

Frequently Asked Questions

Will resetting my Carrier furnace erase the fault code history?

A thermostat soft reset or circuit breaker reset clears the active fault and allows a new startup attempt, but many Carrier control boards store a history of recent faults in non-volatile memory. A technician with a diagnostic tool can often retrieve this history. The LED flash pattern you observed before resetting is the most important information to record before performing any reset.

How many times can I reset my Carrier furnace before calling a technician?

It is reasonable to reset once or twice while you check the obvious causes: air filter, gas shutoff valve position, thermostat settings. If the same fault code returns on the second attempt, the root cause is still active and resetting further is unlikely to help and may delay diagnosis. Three consecutive resets with the same fault code is a signal to call an HVAC technician.

My Carrier furnace reset worked but the same code came back the next day. What does this mean?

An intermittent fault that clears on reset and returns after several hours often indicates a component that is borderline but not fully failed: a flame sensor near the end of its reliable service life, a run capacitor that still functions under light load but fails under thermal stress, or a pressure switch with a marginal diaphragm. The root cause is real but not consistent enough to trigger the fault on every cycle yet. This pattern typically worsens over time.

Does a Carrier furnace need to be reset after a power outage?

Most Carrier furnaces will restart automatically after a power outage restores. The control board reinitializes and the furnace attempts a normal startup if there is an active heat call. However, if the power outage caused a voltage spike that triggered a fault code, the board may require a manual reset. If the furnace does not restart after power is restored, perform the thermostat soft reset as described above.

Where is the rollout limit switch reset button on a Carrier 59TP6 furnace?

On most Carrier 59TP6 models, the rollout limit switch is located on the burner manifold bracket, near the front of the burner assembly inside the lower cabinet. It is a small rectangular or disk-shaped component with two wires and a small raised button on the face. Open the lower cabinet door (no tools required on most models) and the switch is accessible without removing the burner assembly.

Related Carrier Furnace Error Codes

Code: HUBCarrier Furnace LED Flash Codes: Complete Fault Code Guide Code: 3 Short 3 LongCarrier Furnace Code 33: Pressure Switch Fault Code: 34Carrier Furnace Code 34: Ignition Proving Failure

Models Known to Experience RESET Errors

This repair applies to most Carrier furnaces with this error code. Common model numbers include:

59TP6, 59MN7, 59SP5, 59TP6A, 58PAV

Last verified for technical accuracy on March 14, 2026