Furnace flashing an error code?
It is ‘always’ best practice to have a licensed technician complete a thorough assessment, however it is good to know what you are looking at for the reason you have “no heat”.
Carrier Furnace Error Codes
Each status code is a two-digit number. The first number is determined by the number of short flashes and the second digit by the number of long flashes.
|Carrier Error Code||What this means||Action required|
|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 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.|
Tasks to Leave to a Furnace Repair Expert
When troubleshooting your furnace doesn’t solve your heating issues, never hesitate to contact a trained HVAC contractor. Any furnace, regardless of its age, may pose combustion- or gas-related safety hazards, so it’s always a good idea to have an expert examine the unit and suggest the best course of action.
Carrier Furnace Model Numbers
Discontinued Carrier Furnace Models
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