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

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

The codes below apply across common Daikin models (DM96, DC96, DM80). Meanings follow Daikin’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 Daikin furnace error codes

Daikin gas furnaces use two diagnostic display types depending on the control board, all read through the small sight-glass window in the lower (blower) access door. (1) SINGLE-STAGE models such as DM96SN/DM96SE/DC96 use a single multi-color (red/amber/green) LED on the integrated control board. RED flashes indicate faults: count the red blinks between pauses to read the code. (2) TWO-STAGE, VARIABLE-SPEED, MODULATING and ComfortNet-communicating models such as DM80VC, DC80VC, DM96VC and DM97MC/DC97MC use a dual 7-segment display showing alphanumeric codes (E#, b#, d#, EF) read left-to-right. Daikin furnaces share the same Goodman/Amana control platform (same parent company), so these codes also match comparable Goodman/Amana furnaces. The two systems use overlapping numbers with different meanings, so always confirm against the diagnostic label printed inside the access door of the SPECIFIC model.

Daikin furnace error codes & what they mean

These are the Daikin 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 light)	No power to the integrated control board, or a failed control. (Single-stage red/amber/green LED board) pro repair	Furnace power switch turned off; Tripped breaker or blown line fuse; Open low-voltage fuse on the control board	Confirm the furnace power switch (looks like a light switch near the furnace) is ON; Check the breaker for the furnace and reset it once if tripped; Make sure the blower access door is fully closed
Steady ON (green) / Single flash at power-up then ON	Standby normal operation, no thermostat requests. The LED flashes once at power-up and then remains on. (Single-stage board) DIY-checkable	Normal operation, no fault present	No action needed; this indicates the control is powered and healthy; If the furnace is not heating, set the thermostat to Heat and several degrees above room temperature
Steady ON (red)	Control fault detected / internal hard lockout. The integrated control board has detected an internal failure. (Single-stage board) pro repair	Internal control board failure	Turn the furnace switch off, wait about 30 seconds, and turn it back on once; If the steady red light persists, call a licensed HVAC technician
RAPID FLASH (red)	Reversed line-voltage polarity. The 115V hot and neutral are reversed, or there is a grounding problem. (Single-stage board) pro repair	Line-voltage (115V) hot and neutral reversed at the furnace or outlet; Poor or missing equipment ground; Miswiring after a recent installation or repair	No safe homeowner fix; this is a wiring/grounding issue for a licensed technician
1 FLASH (red)	System lockout – ignition retries exceeded. The furnace failed to establish flame after 3 ignition attempts and locked out. (Single-stage board) pro repair	Gas supply off or interrupted; Dirty or misaligned flame sensor; Weak, cracked or improperly positioned igniter	Verify the gas is on (check that other gas appliances such as a stove or water heater work); Confirm the thermostat is set to Heat and above room temperature; Replace a dirty air filter
2 FLASHES (red)	Pressure sensor (PS) null error: inconsistent reading with inducer OFF / draft-inducer pressure switch circuit closed at start of cycle. (Single-stage board) pro repair	Pressure switch contacts stuck closed; Short in the pressure switch circuit wiring; Pressure sensor hose/connection issue	Replace a dirty air filter; Check that outdoor vent/intake terminals are clear of obstructions; Try one single power-cycle to see if it clears
3 FLASHES (red)	Pressure sensor (PS) null error: inconsistent reading with inducer ON / draft-inducer pressure switch circuit not closed (open). (Single-stage board) pro repair	Pressure switch hose blocked, pinched or connected improperly; Blocked flue and/or inlet air pipe; Weak or failing induced draft blower	Check that outdoor vent and intake terminals are clear of snow, ice, leaves or debris; Replace a dirty air filter; Try one single power-cycle
4 FLASHES (red)	High limit switch open, baffle limit switch open, or auxiliary limit switch open. A temperature-limit safety has tripped. (Single-stage board) pro repair	Dirty air filter restricting airflow; Restrictive or blocked ductwork; closed supply registers; Blower set to too low a speed or failing blower motor	Replace a dirty air filter (a clogged filter is the most common cause); Make sure supply and return registers/vents are open and unblocked; Try one single power-cycle
5 FLASHES (red)	Flame present with gas valve OFF. The control senses a flame when the gas valve is de-energized. SAFETY-CRITICAL. (Single-stage board) pro repair	Lingering or residual burner flame; Slow-closing or leaking gas valve; Short to ground in the flame-sense circuit	Do not keep resetting the furnace. If you smell gas, leave and call your gas utility's emergency line; Turn the furnace switch off and call a licensed HVAC technician
6 FLASHES (red)	Burner box limit (burner temperature/rollout) switch open. SAFETY-CRITICAL. (Single-stage board) pro repair	Flame rollout from a cracked/plugged heat exchanger or blocked flue; Incorrect gas supply pressure; Blocked flue or air inlet	Do not keep resetting the furnace. Shut the furnace switch off and call a licensed HVAC technician; Check that outdoor vent/intake terminals are not blocked
7 FLASHES (red)	Gas valve circuit shorted (gas valve energized when it should not be, or internal gas-valve error). (Single-stage board) pro repair	Short in the gas-valve circuit wiring; Internal gas-valve fault; Control board fault	Turn the furnace switch off and call a licensed HVAC technician (gas-valve circuit work is not a homeowner task)
8 FLASHES (red)	Blocked vent. The control has detected a blocked flue/vent condition. (Single-stage board) pro repair	Blocked or obstructed flue/vent or intake piping; Snow, ice, leaves, or animal nest at the outdoor vent terminal; Improper vent length, too many elbows, or incorrect termination	Check that outdoor vent and intake terminals are clear of snow, ice, leaves, or debris; Try one single power-cycle once the terminals are confirmed clear
On (7-segment)	Normal operation / standby. (Communicating, two-stage, variable-speed and modulating models with dual 7-segment display) DIY-checkable	Normal operation, no fault present	No action needed; If the furnace is not heating, set the thermostat to Heat and above room temperature
E0	Lockout due to excessive retries. Failure to establish flame after the control cycles the gas valve 3 times. (7-segment communicating board) pro repair	Gas supply off or interrupted; Front-cover/pressure switch stuck open; Bad, cracked, or improperly connected igniter	Verify the gas is on (check that other gas appliances work); Confirm the thermostat is set to Heat and above room temperature; Replace a dirty air filter
E1	Low-stage pressure switch stuck closed at the start of the heating cycle. (7-segment communicating board) pro repair	Low-stage pressure switch contacts sticking closed; Short in the pressure switch circuit wiring; Faulty pressure switch	Replace a dirty air filter; Try one single power-cycle to see if it clears
E2	Low-stage pressure switch stuck open. The pressure switch does not close within 5 minutes after the inducer starts; control goes into a 1-hour lockout. (7-segment communicating board) pro repair	Disconnected, blocked, or pinched pressure switch hose; Restricted air intake or flue piping; Weak induced draft blower	Check that outdoor vent and intake terminals are clear of obstructions; Replace a dirty air filter; Try one single power-cycle (control also auto-resets after one hour)
E3	Open high limit (primary, auxiliary, or rollout limit) switch. A temperature safety has tripped. The blowers run until the limit closes. (7-segment communicating board) pro repair	Low conditioned airflow from a dirty filter or restrictive ductwork; Blower speed set too low or failing blower motor; Misaligned burners or flame rollout	Replace a dirty air filter; Make sure supply and return registers/vents are open and unblocked; Try one single power-cycle
E4	Flame detected when no flame should be present (flame sensed with no call for heat). SAFETY-CRITICAL. (7-segment communicating board) pro repair	Short to ground in the flame-sense circuit; Miswiring; Lingering burner flame	Do not keep resetting the furnace. If you smell gas, leave and call your gas utility's emergency line; Turn the furnace switch off and call a licensed HVAC technician
E5	Open fuse. The control detects an open low-voltage fuse and inhibits furnace operation except the error display. (7-segment communicating board) pro repair	Short in the low-voltage wiring, internal or external to the furnace (e.g., thermostat wiring); Blown low-voltage fuse on the control board	No safe homeowner fix; low-voltage fuse and wiring diagnosis is a licensed-technician task
E6	Low flame (sense) signal. The flame-sensor micro-amp signal has fallen below the specified level. (7-segment communicating board) pro repair	Coated or oxidized flame sensor; Flame sensor incorrectly positioned in the burner flame; Lazy burner flame from improper gas pressure or combustion air	Replace a dirty air filter; Verify the gas is on (check other gas appliances); Flame-sensor cleaning/adjustment requires a licensed technician
E7	Igniter fault or improper grounding. Problem with the igniter circuit or a no-ground condition. (7-segment communicating board) pro repair	Broken or improperly connected igniter; Shorted igniter; Poor unit ground	Turn the furnace switch off and call a licensed HVAC technician (igniter and grounding work is not a homeowner task)
E8	High-stage pressure switch stuck closed at the start of the heating cycle. Furnace operates on low stage only. (7-segment communicating board) pro repair	High-stage pressure switch contacts sticking closed; Short in the high-stage pressure switch wiring	Replace a dirty air filter; Try one single power-cycle to see if it clears
E9	High-stage pressure switch stuck open (E9 followed by a pause). (7-segment communicating board) pro repair	Pressure switch hose blocked or pinched; Blocked flue and/or inlet air pipe; Blocked condensate drain	Check that outdoor vent and intake terminals are clear of obstructions; Replace a dirty air filter; Try one single power-cycle
EA	Reversed 115 VAC polarity. The 115V or 24V AC power leads are reversed and the furnace will not operate. (7-segment communicating board) pro repair	115V AC power to the furnace wired with hot/neutral reversed; 24V transformer wires reversed; Poor unit ground	No safe homeowner fix; reversed-polarity/grounding correction is a licensed-technician task
EF	Auxiliary switch open. The auxiliary (blower-compartment) limit circuit is open. (7-segment communicating board) pro repair	Furnace power was turned off during a heat cycle; Blower not operating during heat call; Faulty auxiliary limit or wiring	Confirm the furnace power switch is ON and the blower door is fully closed; Replace a dirty air filter (restricted airflow can trip the auxiliary limit); Try one single power-cycle
d0	No shared data / data not yet on network. The control does not contain the shared data set required to drive the variable-speed motor and calculate airflow. (7-segment communicating board) pro repair	Control needs a model-specific memory card to populate shared data; After a control board replacement before shared data is loaded	No safe homeowner fix; loading shared data requires the correct memory card and a licensed technician
d4	Invalid memory card data. The control rejected the shared data set on a memory card (memory cards are model-specific). (7-segment communicating board) pro repair	Wrong-model or invalid memory card used; Shared data set does not match the furnace model	No safe homeowner fix; correct memory card and a licensed technician are required
b0	Blower (ECM) motor not running. The control fails to detect the ECM blower motor running when it should be. (7-segment communicating board) pro repair	Loose or disconnected wiring between motor and control; Open inductor (3/4 Hp and 1 Hp motors); Failed ECM blower motor	Confirm the blower access door is fully closed; Try one single power-cycle; if the code returns, call a licensed HVAC technician
b1	Blower communication error / ECM motor communications lost. The furnace control cannot communicate with the ECM blower motor. (7-segment communicating board) pro repair	Loose or disconnected wiring between motor and control; Failed ECM blower motor; Failed control board	Try one single power-cycle; if the code returns, call a licensed HVAC technician
b2	Blower motor horsepower mismatch. The connected motor's horsepower does not match the value specified in the shared data set. (7-segment communicating board) pro repair	Wrong replacement motor installed for the furnace model; Incorrect shared data set for the furnace	No safe homeowner fix; correct motor/shared data is a licensed-technician task
b3	Blower (ECM) motor operating in a power, temperature, or speed limiting condition. The furnace continues at reduced performance. (7-segment communicating board) pro repair	Blocked or clogged air filter; Blocked, restrictive, or undersized ductwork; Blocked blower inlet	Replace a dirty air filter; Make sure supply and return registers/vents are open and unblocked
b4	Blower motor current trip or lost rotor. The ECM motor sensed a loss of control or became overloaded and tripped. (7-segment communicating board) pro repair	Sudden duct-system blockage or sudden increase in motor loading (lost-rotor trip); Overload from blocked/clogged filters or restrictive/undersized ductwork (current trip)	Replace a dirty air filter; Make sure registers/vents are open and unblocked; Try one single power-cycle
b5	Blower motor locked rotor. The ECM motor fails to start after 10 consecutive attempts. (7-segment communicating board) pro repair	Obstruction in the blower housing or wheel; Seized motor bearings; Failed blower motor	No safe homeowner fix; blower-motor service requires a licensed technician
b6	Blower motor over/under voltage trip or over-temperature trip. The ECM motor shuts down on abnormal line voltage or excessive power-module temperature. (7-segment communicating board) pro repair	Line voltage above 140 VAC (over-voltage) or below 70 VAC (under-voltage); High ambient temperature or high motor loading causing over-temperature	If other devices in the home are also flickering/browning out, it may be a utility/supply issue to report to your electrician or utility; Replace a dirty air filter and ensure registers are open to reduce motor loading
b7	Incomplete parameters sent to motor / motor parameters error. The motor did not receive all information it needs, or failed to start for 40 consecutive attempts. (7-segment communicating board) pro repair	Intermittent wiring connection between control and motor; Furnace control error; Conditions described under b4, b5, or b6	Try one single power-cycle; if the code returns, call a licensed HVAC technician
b9	Low indoor airflow. Indoor airflow has fallen below the calculated minimum; the furnace continues at reduced performance (or stages down). (7-segment communicating board) pro repair	Blocked or clogged air filter; Restrictive or undersized ductwork; Closed or blocked supply registers	Replace a dirty air filter; Make sure all supply and return registers/vents are fully open and unblocked

Daikin furnace codes we get called for most

1 FLASH (red) — System lockout – ignition retries exceeded. The furnace failed to establish flame after 3 ignition attempts and locked out. (Single-stage board)

Typical causes include gas supply off or interrupted; dirty or misaligned flame sensor; weak, cracked or improperly positioned igniter. A few things are safe to check yourself (Verify the gas is on (check that other gas appliances such as a stove or water heater work); Confirm the thermostat is set to Heat and above room temperature), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 1 FLASH (red) on Daikin furnaces throughout Greater Vancouver.

2 FLASHES (red) — Pressure sensor (PS) null error: inconsistent reading with inducer OFF / draft-inducer pressure switch circuit closed at start of cycle. (Single-stage board)

Typical causes include pressure switch contacts stuck closed; short in the pressure switch circuit wiring; pressure sensor hose/connection issue. A few things are safe to check yourself (Replace a dirty air filter; Check that outdoor vent/intake terminals are clear of obstructions), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 2 FLASHES (red) on Daikin furnaces throughout Greater Vancouver.

4 FLASHES (red) — High limit switch open, baffle limit switch open, or auxiliary limit switch open. A temperature-limit safety has tripped. (Single-stage board)

Typical causes include dirty air filter restricting airflow; restrictive or blocked ductwork; closed supply registers; blower set to too low a speed or failing blower motor. A few things are safe to check yourself (Replace a dirty air filter (a clogged filter is the most common cause); Make sure supply and return registers/vents are open and unblocked), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 4 FLASHES (red) on Daikin furnaces throughout Greater Vancouver.

E3 — Open high limit (primary, auxiliary, or rollout limit) switch. A temperature safety has tripped. The blowers run until the limit closes. (7-segment communicating board)

Typical causes include low conditioned airflow from a dirty filter or restrictive ductwork; blower speed set too low or failing blower motor; misaligned burners or flame rollout. A few things are safe to check yourself (Replace a dirty air filter; Make sure supply and return registers/vents are open and unblocked), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes E3 on Daikin furnaces throughout Greater Vancouver.

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

Most Daikin 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.

Daikin furnace repair across Greater Vancouver

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

Daikin furnace service areas

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

Daikin furnace error code FAQs

Can I reset my Daikin 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 Daikin 1 FLASH (red) code mean?

On Daikin furnaces, 1 FLASH (red) commonly indicates system lockout – ignition retries exceeded. the furnace failed to establish flame after 3 ignition attempts and locked out. (single-stage board). 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 Daikin furnaces you didn’t install?

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

It depends on the fault. Many Daikin 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: