Carrier Furnace Error Codes — Meanings, Causes & Repair in Greater Vancouver

Seeing a fault code on your Carrier furnace? This guide explains what the most common Carrier furnace error codes mean, what’s safe to check yourself, and when to call HeatLand’s licensed, TSBC-certified gas technicians for Carrier furnace repair across Metro Vancouver and the Fraser Valley.

The codes below apply across common Carrier models (Infinity, Performance, Comfort). Meanings follow Carrier’s documented fault codes — always confirm against your unit’s own manual, because exact wording can vary by model, control board and firmware.

How to read Carrier furnace error codes

Carrier furnace status codes (amber LED flash count; the 2-digit code is read as the number of SHORT flashes = first digit, then a pause, then the number of LONG flashes = second digit, e.g. 1 short then 3 long = code 13). View the LED through the viewport in the blower access panel. A full code chart is printed on the service label inside the furnace casing. On Infinity communicating systems the same 2-digit code shows on the control board and a plain-language description appears on the Infinity/SAM wall control.

Carrier furnace error codes & what they mean

These are the Carrier furnace codes our Greater Vancouver technicians see most. Anything marked pro repair involves gas, electrical, sealed-combustion or control-board work that must be done by a licensed gas technician (TSBC-certified in BC) — never open gas or electrical components yourself.

Code	What it usually means	Common causes	Safe to check yourself
11	No previous code. Stored status codes are erased when 115V or 24V power to the control is interrupted, or about 48 hours / set time after a fault is cleared. This is a normal 'no faults stored' indication, not an error DIY-checkable	Normal state with no stored faults; Memory recently cleared by a power interruption	No action needed; this indicates no stored fault
12	Blower on after power up. The blower runs (about 90 seconds) because the unit was powered up during a call for heat (R-W closed). This is informational, not a fault DIY-checkable	Power restored while the thermostat was calling for heat; Recent power interruption during a heat cycle	Confirm the thermostat is set correctly; Allow the blower to finish its timed run; no action usually needed
13	Limit circuit lockout. The high-limit or flame roll-out switch stayed open too long (open longer than ~3 minutes escalates code 33 to this lockout). On most controls it auto-resets after about 3 hours. Indicates an overheating or roll-out condition pro repair	Dirty or clogged air filter restricting airflow; Blocked supply/return registers or grilles; Failed blower motor or wheel	Turn the furnace off at its switch, then check and clean or replace the air filter; Make sure supply and return registers/grilles are open and unobstructed; Set the thermostat to heat and confirm a call for heat
14	Ignition lockout. The control failed to establish/prove flame after the allowed number of ignition attempts (typically after repeated code 34 failures). The control will auto-reset after about 3 hours pro repair	No gas / gas supply turned off; Failed or dirty hot surface igniter; Dirty or failed flame sensor	Confirm the gas supply is on and other gas appliances (stove, water heater) are working; Set the thermostat to heat; Turn the furnace off then on once at its switch to reset
15	Blower motor lockout. The control has locked out the variable-speed/ECM blower motor after repeated blower motor faults pro repair	Failed ECM blower motor or motor module; Wiring/connection problem to the blower motor; Furnace control board fault	Turn the furnace off then on once at its switch to attempt a reset; Confirm the thermostat is calling for heat or fan; Check and replace a dirty air filter
21	Gas heating lockout. A gas-heating safety lockout that the control will NOT auto-reset; power must be cycled to clear it pro repair	Gas valve relay or control fault; Repeated gas-heating safety trips; Wiring fault in the gas valve circuit	Confirm the gas supply is on and other gas appliances work; Turn the furnace off then on once at its switch to attempt a reset
22	Abnormal flame-proving signal. Flame is being proved (sensed) while the gas valve is de-energized, indicating the burner appears lit when it should be off pro repair	Gas valve leaking through / slow to close; Flame sensor or flame-sense circuit fault; Furnace control board fault	Turn the furnace off at its switch; Do not attempt internal repairs; have a licensed technician inspect the gas valve and flame sensing
23	Pressure switch did not open. The pressure switch failed to open (contacts stuck closed) when it was expected to open during the cycle pro repair	Pressure switch stuck closed or faulty; Pressure switch tubing/wiring issue; Furnace control board fault	Turn the furnace off then on once at its switch; Confirm the thermostat is set to heat; Have a licensed technician inspect the pressure switch
24	Secondary voltage fuse is open. The 24V control fuse has opened, typically due to a short in the low-voltage wiring pro repair	Short in the low-voltage (24V) thermostat or accessory wiring; Pinched or grounded control wire; Shorted transformer, relay or accessory	Turn the furnace off at its switch; Note any recent thermostat or accessory wiring work; have a licensed technician find and clear the short and replace the fuse
25	Model selection or setup error. The control's model plug / model selection or setup configuration is incorrect or missing pro repair	Missing or wrong model plug on the control board; Incorrect setup after a control board replacement; Control board fault	Turn the furnace off then on once at its switch; Have a licensed technician verify the correct model plug / setup configuration
31	Pressure switch (or HPS/PSR relay) did not close or reopened. On single-stage models: the pressure, draft safeguard, auxiliary-limit (when used) or blocked-vent shutoff (when used) switch did not close or reopened. On two-stage/modulating models this is the medium/high pressure switch or pressure-switch relay (HPSR/PSR) not closing or reopening pro repair	Blocked or restricted vent / intake terminal; Weak or failing inducer (draft) motor; Disconnected, cracked or plugged pressure-switch tubing	Go outside and clear any snow, ice, leaves or debris from the intake and exhaust vent terminals; Turn the furnace off then on once at its switch; Confirm the thermostat is set to heat
32	Low-heat (low) pressure switch did not close or reopened. The low-heat pressure switch (LPS) did not make, or the low gas pressure switch (LGPS) opened pro repair	Blocked or restricted vent / intake; Weak inducer motor; Pressure-switch tubing disconnected, cracked or plugged	Clear snow/ice/debris from the outdoor intake and exhaust vent terminals; Confirm the gas supply is on and other gas appliances work; Turn the furnace off then on once at its switch
33	Limit circuit fault. The high-limit or flame roll-out switch is open. If it stays open longer than about 3 minutes, the code changes to a code 13 lockout pro repair	Dirty or clogged air filter; Blocked supply/return registers restricting airflow; Failed blower motor or wheel	Turn the furnace off at its switch and check/clean or replace the air filter; Make sure all supply and return registers/grilles are open and unblocked; Power-cycle the furnace once at the switch or breaker
34	Ignition-proving fault. The control did not prove flame after a successful ignition attempt. The control will retry; repeated failures lead to an ignition lockout (code 14) pro repair	Dirty flame sensor; Weak or failing hot surface igniter; Low gas pressure or partially closed gas supply	Confirm the gas supply is on and other gas appliances work; Turn the furnace off then on once at its switch to allow a fresh ignition attempt; Replace a dirty air filter
35	Gas valve fault. The control has detected a fault in the modulating gas valve or its circuit/communication pro repair	Faulty modulating gas valve; Wiring/connection problem to the gas valve; Furnace control board fault	Turn the furnace off then on once at its switch; Have a licensed technician inspect the gas valve and its wiring
41	Blower motor fault. The blower (ECM/variable-speed) motor failed its test. Check the blower, wiring and furnace control pro repair	Failed ECM blower motor or motor module; Failed run capacitor (on applicable motors); Wiring/connection problem to the blower motor	Turn the furnace off then on once at its switch; Confirm the thermostat is calling for heat or fan; Check and replace a dirty air filter
42	Inducer motor fault. The inducer (draft) motor failed its test. Check the inducer, wiring and furnace control pro repair	Failed inducer motor; Wiring/connection problem to the inducer; Furnace control board fault	Turn the furnace off then on once at its switch; Clear any blockage at the outdoor vent terminals; Have a licensed technician inspect the inducer motor
43	Low/medium pressure switch open while the higher-stage pressure switch is closed. On two-stage models: low-heat pressure switch open while medium-heat pressure switch is closed. On modulating models: low or medium pressure switch open while the medium or high pressure switch is closed pro repair	Pressure switch tubing disconnected, cracked or plugged; Faulty pressure switch; Inducer or venting restriction affecting one switch stage	Clear snow/ice/debris from the outdoor intake and exhaust vent terminals; Turn the furnace off then on once at its switch; Have a licensed technician inspect the pressure switches and tubing
45	Control circuitry lockout. Auto-resets after about 1 hour. Caused by a flame-sense circuitry failure or other internal control fault; resetting power may clear it, and if it recurs the gas valve or control may need replacement pro repair	Flame-sense circuitry failure on the control board; Internal control board fault; Gas valve relay/circuit fault	Turn the furnace off then on once at its switch to attempt a reset; If the code returns, have a licensed technician inspect the control board and gas valve

Carrier furnace codes we get called for most

14 — Ignition lockout. The control failed to establish/prove flame after the allowed number of ignition attempts (typically after repeated code 34 failures). The control will auto-reset after about 3 hours

Typical causes include no gas / gas supply turned off; failed or dirty hot surface igniter; dirty or failed flame sensor. A few things are safe to check yourself (Confirm the gas supply is on and other gas appliances (stove, water heater) are working; Set the thermostat to heat), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 14 on Carrier furnaces throughout Greater Vancouver.

23 — Pressure switch did not open. The pressure switch failed to open (contacts stuck closed) when it was expected to open during the cycle

Typical causes include pressure switch stuck closed or faulty; pressure switch tubing/wiring issue; furnace control board fault. A few things are safe to check yourself (Turn the furnace off then on once at its switch; Confirm the thermostat is set to heat), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 23 on Carrier furnaces throughout Greater Vancouver.

13 — Limit circuit lockout. The high-limit or flame roll-out switch stayed open too long (open longer than ~3 minutes escalates code 33 to this lockout). On most controls it auto-resets after about 3 hours. Indicates an overheating or roll-out condition

Typical causes include dirty or clogged air filter restricting airflow; blocked supply/return registers or grilles; failed blower motor or wheel. A few things are safe to check yourself (Turn the furnace off at its switch, then check and clean or replace the air filter; Make sure supply and return registers/grilles are open and unobstructed), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 13 on Carrier furnaces throughout Greater Vancouver.

12 — Blower on after power up. The blower runs (about 90 seconds) because the unit was powered up during a call for heat (R-W closed). This is informational, not a fault

Typical causes include power restored while the thermostat was calling for heat; recent power interruption during a heat cycle. A few things are safe to check yourself (Confirm the thermostat is set correctly; Allow the blower to finish its timed run; no action usually needed), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 12 on Carrier furnaces throughout Greater Vancouver.

Is it safe to keep running a Carrier furnace with a fault code?

Most Carrier fault codes put the furnace into a safe lockout for a reason. You can safely check the basics — the furnace switch and breaker on, a clean air filter, the gas supply on, the thermostat set to heat and calling, and — on high-efficiency models — the condensate drain not blocked or frozen — and restart it once. If the code returns, stop and book a technician. If you ever smell gas, leave the building and call your gas utility’s emergency line or 911 first. If a carbon-monoxide alarm sounds, get everyone out and call 911. A rollout or repeated limit trip can signal a heat-exchanger or venting problem — don’t keep resetting it.

Carrier furnace repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Carrier furnaces — ignition and flame-sensor faults, pressure-switch and venting problems, limit and rollout trips, blower and igniter issues, and control-board errors — including units we didn’t install. We’re brand-agnostic, carry common parts, and give you an honest repair-or-replace assessment with upfront pricing and a free estimate. If your furnace is beyond economical repair, we’ll show you right-sized, high-efficiency replacement options and the rebates available.

Need it sorted fast? We offer priority emergency furnace repair. Explore Furnace services, browse all furnace error codes by brand, or request a free estimate.

Carrier furnace service areas

We repair Carrier furnaces across Greater Vancouver and the Fraser Valley, including:

Carrier furnace error code FAQs

Can I reset my Carrier furnace myself?

Yes — power-cycling the reset button once is generally safe after you’ve checked the basics (the furnace switch and breaker on, a clean air filter, the gas supply on, the thermostat set to heat and calling, and — on high-efficiency models — the condensate drain not blocked or frozen). If the furnace faults again right away, stop and note the code — repeatedly resetting a furnace that keeps locking out can mask a real problem. Call a licensed, TSBC-certified gas technician to diagnose it.

What does the Carrier 14 code mean?

On Carrier furnaces, 14 commonly indicates ignition lockout. the control failed to establish/prove flame after the allowed number of ignition attempts (typically after repeated code 34 failures). the control will auto-reset after about 3 hours. Confirm the exact meaning against your unit’s manual — codes can vary by model and series — and have the repair done by a licensed, TSBC-certified gas technician. HeatLand fixes this across Greater Vancouver.

Do you repair Carrier furnaces you didn’t install?

Yes. HeatLand is brand-agnostic and services Carrier furnaces throughout Metro Vancouver and the Fraser Valley, whether or not we installed the unit. We carry common parts and give you an honest repair-or-replace assessment.

Is a Carrier furnace fault code an emergency?

No heat in cold weather is worth treating urgently. If you ever smell gas, leave the building and call your gas utility’s emergency line or 911 first. If a carbon-monoxide alarm sounds, get everyone out and call 911. A rollout or repeated limit trip can signal a heat-exchanger or venting problem — don’t keep resetting it. For priority furnace repair across Greater Vancouver, call (604) 330-3812.

How much does Carrier furnace repair cost in Vancouver?

It depends on the fault. Many Carrier codes point to sensors, ignition or pump parts — usually far cheaper than replacement. We give upfront pricing and a free estimate before any work.

More Furnace error-code guides

HeatLand repairs every major furnace brand across Greater Vancouver. More brand guides: