Daikin Error Code EE3: High (primary) limit open (Furnace)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Daikin error code EE3 on a furnace means: High (primary) limit open. It is also called Daikin diagnostic code EE3.

High severityFurnaceDaikin DR96TN/DD96TN

Homeowner? What Daikin code EE3 means for you

Call a technician Your furnace is reporting: High (primary) limit open. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Daikin error code EE3 mean?

The primary limit circuit is open because the heat exchanger got too hot. The circulator blower runs continuously and the furnace will not fire.

Applies to: Daikin DR96TN (upflow/horizontal) and DD96TN (downflow/horizontal) two-stage 96% furnaces with 9-speed ECM motor, R-32 ready

Common causes of Daikin code EE3

Dirty filter or restrictive / closed ductwork
Heating blower speed too low (temperature rise too high)
Failed circulator blower motor or loose motor harness

A technician checks these and 2 other possible causes on site before replacing any part.

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Daikin models that use code EE3

DD96TN0403BN DD96TN0603BN DD96TN0803BN DD96TN1005CN DR96TN0303AN DR96TN0403AN DR96TN0603AN DR96TN0603BN DR96TN0803BN DR96TN0804CN DR96TN1004CN DR96TN1005CN DR96TN1205DN

Other Daikin Furnace codes

Code	Meaning
EAS	R-32 sensor fault - mitigation mode
EbL	Low circulator current - hard lockout
EbU	Unexpected circulator current - hard lockout
EE0	Lockout - too many ignition retries (3)
EE1	Pressure switch closed at start of heating cycle
EE2	Pressure switch did not close (inducer runs, no ignition)
EE4	Flame sensed with no call for heat
EE5	Open fuse (short in low voltage wiring)
EE6	Low flame signal
EE8	High-stage pressure switch closed at start of heating cycle
EE9	High-stage pressure switch did not close
EEA	Reversed line polarity or grounding error

All Daikin Furnace error codes →

Daikin code EE3: homeowner questions

What does Daikin code EE3 mean?

High (primary) limit open. The primary limit circuit is open because the heat exchanger got too hot. The circulator blower runs continuously and the furnace will not fire.

Is it safe to keep using my furnace with code EE3?

It depends on the cause. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset Daikin code EE3 myself?

You can try one reset (power off for 30 seconds, then on). If Daikin code EE3 comes back, the cause is still there and a licensed technician should check it.

Who can fix Daikin code EE3 near me?

Aurora Star Tech Inc. repairs Daikin furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean

Troubleshooting guides

Blowing cold air All brands · Furnace
No heat All brands · Furnace
Short cycling All brands · Furnace
Control display blank, furnace dead - Daikin DR96TN/DD96TN Daikin · Furnace
Furnace not paired with R-32 cooling - disable A2L function - Daikin DR96TN/DD96TN Daikin · Furnace
No heat - Daikin DR96TN/DD96TN Daikin · Furnace

Source: Daikin RSD6612304 (DR96TN/DD96TN service), 2 Stage Troubleshooting Codes, p.28-29; Checking Primary Limit / Auxiliary Limit p.19-20. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.