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

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

The codes below apply across common Napoleon models (9600, 9700). Meanings follow Napoleon’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 Napoleon furnace error codes

Single status LED on the integrated furnace control board indicates faults by counting flashes (1 to 10). LED OFF = no power or control hardware fault; LED ON (steady) = normal operation. A separate high-heat-stage LED (yellow on some models, green/AN2 on others) reports the high-heat call. The control stores the last 5 fault codes (Fault Code History): press the diagnostic button to display stored codes (most recent first); hold the button 5+ seconds to clear. Earlier 9600 B printings label the inducer 'inducer' while other printings say 'exhauster' — same meaning. Always read the actual flash count at the board, not just the symptom.

Napoleon furnace error codes & what they mean

These are the Napoleon 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
LED OFF	No power to control, or a control hardware fault has been detected pro repair	Furnace disconnect switch off or tripped breaker; Blown low-voltage fuse on the control board; Loss of incoming 120V power	Confirm the furnace switch (looks like a light switch near the unit) is ON; Check the breaker for the furnace and reset it once if tripped; Try a single power-cycle: switch the furnace off, wait, switch it back on
LED ON (steady)	Normal operation – no fault detected DIY-checkable	Furnace operating normally	No action needed; this indicates the control is healthy
1 Flash	High limit switch open pro repair	Dirty or clogged air filter restricting airflow; Blocked return or supply registers/ductwork; Blower motor problem reducing airflow	Inspect the air filter and replace it if it is dirty; Make sure supply and return vents/registers are open and unblocked; Set the thermostat to heat and confirm a normal temperature setting
2 Flashes	Pressure switch open with exhauster (inducer) on pro repair	Blocked or restricted intake/exhaust vent terminals; Condensate drain blockage causing pressure backup; Cracked, disconnected or pinched pressure switch tubing	Check that outdoor intake and exhaust vent terminals are clear of snow, ice, debris, leaves or nests; Try a single power-cycle of the furnace
3 Flashes	Pressure switch closed with exhauster (inducer) off pro repair	Pressure switch contacts stuck closed; Wiring fault to the pressure switch; Failed pressure switch	Try a single power-cycle of the furnace
4 Flashes	Lockout due to too many failed ignition attempts (1 hour lockout) pro repair	Gas supply off or interrupted; Dirty or failed flame sensor; Faulty hot surface igniter	Confirm the gas supply is on (check that other gas appliances such as a stove or water heater work); Set the thermostat to heat with a normal setpoint; Try a single power-cycle to clear the lockout
5 Flashes	L1/Neutral polarity problem pro repair	Line (L1) and neutral wiring reversed at the furnace or outlet; Poor or missing equipment ground; Miswired junction box or branch circuit	Try a single power-cycle of the furnace; if the code returns, it is a wiring issue for a technician/electrician
6 Flashes	Too many limit trips within one call for heat pro repair	Dirty air filter or restricted airflow causing repeated overheating; Blocked supply/return ductwork or registers; Blower or blower-speed problem	Inspect and replace a dirty air filter; Confirm supply and return vents/registers are open and unobstructed; Try a single power-cycle of the furnace
7 Flashes	Pressure switch cycle lockout pro repair	Repeated pressure switch open/close events (marginal venting); Partial vent blockage or condensate backup; Weak or failing inducer (exhauster) motor	Check that outdoor intake and exhaust vent terminals are clear; Try a single power-cycle of the furnace
8 Flashes	Lockout due to too many flame dropouts (flame lost during operation) pro repair	Dirty or weak flame sensor; Marginal gas supply or low gas pressure; Burner or gas valve problem	Confirm the gas supply is on (verify other gas appliances operate); Try a single power-cycle to clear the lockout
9 Flashes	Not used DIY-checkable	This flash count is not assigned to a fault on these models	No action defined for this code
10 Flashes	Flame present with gas valve off (flame sensed when there should be none) pro repair	Gas valve leaking by / not fully closing; Flame-sensing circuit fault on the control; Stuck or failed gas valve	Do not attempt repairs; this is a gas-related fault – shut the furnace off at the switch and contact a licensed technician
High-heat LED FLASHING	High heat demand present, but the high pressure switch has not closed. (Separate high-heat-stage LED – yellow on 9700 and some 9600 printings, green/AN2 on 9600 B.) pro repair	Restricted intake/exhaust venting affecting the high-stage pressure switch; Condensate or tubing issue at the high pressure switch; Inducer (exhauster) not reaching high-stage speed	Check that outdoor intake and exhaust vent terminals are clear of obstructions; Try a single power-cycle of the furnace

Napoleon furnace codes we get called for most

4 Flashes — Lockout due to too many failed ignition attempts (1 hour lockout)

Typical causes include gas supply off or interrupted; dirty or failed flame sensor; faulty hot surface igniter. A few things are safe to check yourself (Confirm the gas supply is on (check that other gas appliances such as a stove or water heater work); Set the thermostat to heat with a normal setpoint), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 4 Flashes on Napoleon furnaces throughout Greater Vancouver.

8 Flashes — Lockout due to too many flame dropouts (flame lost during operation)

Typical causes include dirty or weak flame sensor; marginal gas supply or low gas pressure; burner or gas valve problem. A few things are safe to check yourself (Confirm the gas supply is on (verify other gas appliances operate); Try a single power-cycle to clear the lockout), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 8 Flashes on Napoleon furnaces throughout Greater Vancouver.

2 Flashes — Pressure switch open with exhauster (inducer) on

Typical causes include blocked or restricted intake/exhaust vent terminals; condensate drain blockage causing pressure backup; cracked, disconnected or pinched pressure switch tubing. A few things are safe to check yourself (Check that outdoor intake and exhaust vent terminals are clear of snow, ice, debris, leaves or nests; Try a single power-cycle of the furnace), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 2 Flashes on Napoleon furnaces throughout Greater Vancouver.

1 Flash — High limit switch open

Typical causes include dirty or clogged air filter restricting airflow; blocked return or supply registers/ductwork; blower motor problem reducing airflow. A few things are safe to check yourself (Inspect the air filter and replace it if it is dirty; Make sure supply and return vents/registers are open and unblocked), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 1 Flash on Napoleon furnaces throughout Greater Vancouver.

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

Most Napoleon 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.

Napoleon furnace repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Napoleon 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.

Napoleon furnace service areas

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

Napoleon furnace error code FAQs

Can I reset my Napoleon 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 Napoleon 4 Flashes code mean?

On Napoleon furnaces, 4 Flashes commonly indicates lockout due to too many failed ignition attempts (1 hour lockout). 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 Napoleon furnaces you didn’t install?

Yes. HeatLand is brand-agnostic and services Napoleon 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 Napoleon 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 Napoleon furnace repair cost in Vancouver?

It depends on the fault. Many Napoleon 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: