Daikin mini split error code H6
Compressor position detection fault (start-up failure).
- TypeProtection
- SystemCompressor / inverter
- Can I fix it?Technician job
What H6 means on a Daikin
The inverter could not detect the compressor rotor position, so it could not start or keep control of it.
On this platform, H6 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- A failing compressor.
- Loose compressor terminals.
- A failed inverter board.
- Low supply voltage.
How to fix it yourself
Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.
- Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.
- If you own a multimeter and are comfortable using it, measure the supply voltage at the outdoor unit's L1 and L2 terminals with the unit running. A 230 V system should read roughly 208 to 253 VAC.
- With power off, check the compressor terminal cover for loose or scorched connectors.
Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.
When to call a technician
Technician diagnosis.
Which Daikin units show H6
This page applies to Daikin Aurora, 19 Series, Atmosphera, Emura, Quaternity and MXS multi-zone units. Daikin's own documentation lists H6 as "Compressor position detection fault (start-up failure)", the same definition used across the Daikin it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.
Where Daikin shows this code
Most Daikin wall units do not show the code on the unit; the operation lamp blinks. To read the code, point the remote at the unit, hold CANCEL (or Timer Cancel) for about 5 seconds until 00 shows, then press CANCEL repeatedly. Each press shows a code; when the unit gives a long continuous beep instead of two short beeps, the code on the remote is the stored fault. Units with a wired controller show the code directly. A and C codes are indoor-unit faults, E, F, H, J, L and P codes are outdoor-unit faults and protections, and U codes are system-level problems such as communication, power supply and refrigerant shortage.
Other Daikin codes
Same part of the system as H6:
H6 on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- Blueridge H6 Indoor fan motor not running (no feedback)
- Goodman H6 Compressor position detection fault (start-up failure)
Questions people ask
Can I reset a Daikin H6 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If H6 comes back, the fault is real and needs the checks above.
Is it safe to keep running a Daikin showing H6?
Not repeatedly. A protection code means the unit stopped itself to prevent damage, and resetting it over and over can turn a cheap repair into a compressor failure. Reset once, check the basics, and stop if it returns.
What will a technician check for H6?
Technician diagnosis. Ask for the measurements, not just a parts quote.
Sources
- Daikin residential (RA) service manuals (error code tables)
- Daikin operation manuals (remote controller self-diagnosis)
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.