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If you’re looking for help fixing your Carrier furnace, look no further! Our comprehensive Carrier furnace repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model’s error codes.
Rapid LED flashing – Line voltage polarity is reversed.
If twinned, refer to twinning kit instructions.
Error Code 1-1 – No previous code
Stored status codes are erased when power to control is interrupted.
Error Code 1-2 – The blower is on after power up
Blower runs for 90 seconds if the unit is powered up during a call for heat.
Error Code 1-3 – Limit or flame roll-out switch lockout
Control will auto-reset after 3 hours. Reset the switch or replace the fuse link.
Error Code 1-4 – Ignition lockout
Control will auto-reset after 3 hours.
Error Code 2-1 – Gas heating lockout
Control won’t auto-reset. Check for either a badly-wired gas valve or a defective control.
Error Code 2-2 – Abnormal flame-proving signal
Flame is proved while the gas valve is de-energized. Check for either a leaky or stuck-open gas valve.
Error Code 2-3 – Pressure switch didn’t open
Check for an obstruction in the pressure tubing or a pressure switch that is stuck closed.
Error Code 2-4 – Secondary voltage fuse is open
Check for a short circuit in the secondary voltage wiring.
Error Code 3-1 – Pressure, draft safeguard, aux-limit switch, or blocked vent switch didn’t close (or reopened, downflow only)
If open for longer than 5 minutes, the inducer will shut off for 15 minutes before retry. Check for: low inducer voltage; proper vent sizing; defective inducer motor; defective blower motor or capacitor; defective pressure switch; restricted vent; excessive wind, inadequate combustion air supply; or obstructed pressure tubing.
Error Code 3-3 – Limit or flame roll-out switch is open
If the switch is open for longer than 3 minutes, the code will change to #1-3. Flame roll-out switch requires manual reset. Check for: defective blower motor or capacitor; dirty filter or restricted duct system; loose blower wheel; faulty switch or connections; or inadequate combustion air supply.
Error Code 3-4 – Ignition proving failure
Control will try three more times before lockout #1-4 will occur. If the flame signal is lost after the trial for ignition period, the blower will come on for a 90 second recycle delay. Check for: build-up on the flame sensor; proper microamp distribution to the flame sensor; defective gas valve or turned off gas valve; faulty hot surface ignitor; low inlet gas pressure; the manual valve is shut-off; continuity of control ground; low flame carryover or rough ignition; ungrounded flame sensor.
