Comfortmaker mini split error code F6
Overload frequency limiting (protection).
- TypeProtection
- SystemRefrigerant circuit
- Can I fix it?Usually a homeowner fix
- Applies toDLC4 / DLF4 series, 2013 to 2015 (Gree-built)
What F6 means on a Comfortmaker
The unit is deliberately slowing the compressor because a coil temperature is approaching its limit. Output drops but it keeps running. Not a fault by itself, but a warning about airflow.
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
- Dirty filters or coils.
- Very high or very low outdoor temperatures.
- Blocked clearance around the outdoor unit.
How to fix it yourself
You can almost always clear this yourself with the steps below.
- Pull the front panel and check the filters and the indoor coil. Dirty filters and a matted coil restrict airflow, and airflow problems trigger a surprising number of protection codes.
- 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 clearance around the outdoor unit.
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
No technician unless it continues with clean coils in mild weather.
Which Comfortmaker units show F6
This page applies to Comfortmaker DLCSRA / DLCSRB / DLCLRA outdoor with DLFSHA / DLFSFA indoor (2015 and later) and DLC4 / DLF4 (2013 to 2015) units on the DLC4 / DLF4 series, 2013 to 2015 (Gree-built). Comfortmaker's own documentation lists F6 as "Overload frequency limiting (protection)", the same definition used across the Gree platform 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 Comfortmaker shows this code
DLC4 / DLF4 series, 2013 to 2015 (Gree-built): The code shows on the indoor unit's display in place of the temperature. If the display is off, press the Light button on the remote. Some models also count out the code as indicator blinks. E codes are system protections and faults, F codes are mostly sensor faults, H codes are outdoor and compressor protections, U codes are motor and valve faults, and P codes are power-supply faults.
Other Comfortmaker 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 Comfortmaker 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 Comfortmaker 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.
Do I need a technician for Comfortmaker F6?
You can almost always clear this yourself with the steps below. No technician unless it continues with clean coils in mild weather.
Sources
- ICP DLCSRA Outdoor Unit Single Zone Ductless Service Manual 32808000801 (error code table)
- ICP ductless installation instructions IM-KSAIC04-04 (DLCPRA / DLCSRB / DLCERB / DLCLRA error codes)
- ICP R-410A Ductless Split System Service Manual 421 01 9204 00 (DLC4 / DLF4, 2013)
Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.