Goodman mini split error code F6
High pressure in cooling (refrigerant overcharge).
- TypeProtection
- SystemRefrigerant circuit
- Can I fix it?Technician job
What F6 means on a Goodman
Head pressure in cooling mode is too high, which Daikin attributes mainly to an overcharge of refrigerant, though a blocked outdoor coil produces the same result.
On this platform, F6 is a protection: the system stopped or throttled itself to prevent damage; many clear on their own once conditions return to normal.
Common causes
- Too much refrigerant added at installation or service.
- A dirty or blocked outdoor coil.
- The outdoor fan running slow.
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.
- Look at the outdoor unit: clear leaves, cottonwood fluff, snow or ice from the coil and make sure the fan can spin freely and nothing is stacked against the cabinet.
- Check that the outdoor fan runs at full speed in cooling.
- Anything inside the refrigerant circuit (sensors are fine, but valves, compressors and leaks are not) needs EPA-certified refrigerant handling. That is a technician job.
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
A technician needs to weigh the charge.
Which Goodman units show F6
This page applies to Goodman e-Series wall-mount (FTXNG indoor / RXNG outdoor) units. Goodman's own documentation lists F6 as "High pressure in cooling (refrigerant overcharge)", 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 Goodman 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 Goodman codes
Same part of the system as F6:
F6 on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- Pioneer F6 Zone F indoor coil outlet sensor (T2B) fault, shown on the outdoor display
- Blueridge F6 Overload frequency limiting (protection)
- Zone Air F6 Compressor phase loss or reversed phase protection
- Daikin F6 High pressure in cooling (refrigerant overcharge)
Questions people ask
Can I reset a Goodman F6 code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If F6 comes back, the fault is real and needs the checks above.
Is it safe to keep running a Goodman showing F6?
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 F6?
A technician needs to weigh the charge. Ask for the measurements, not just a parts quote.
Sources
- Goodman e-Series product documentation (FTXNG / RXNG models)
- Daikin residential (RA) service manuals (error code tables)
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.