York mini split error code FH
Anti-freeze frequency limiting (protection).
- TypeProtection
- SystemRefrigerant circuit
- Can I fix it?Usually a homeowner fix
What FH means on a York
The indoor coil is getting close to freezing in cooling mode, so the compressor is being slowed. The unit keeps running.
On this platform, FH 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 coil.
- Cooling in a cold room or when it is cold outside.
- Low charge.
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.
- Raise the fan speed and set temperature.
- If it continues with clean filters, suspect low charge.
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 should check the charge if it persists.
Which York units show FH
This page applies to York M-Series inverter-driven (DHM / DHP) and York multi-zone (DHM…CMB) units. York's own documentation lists FH as "Anti-freeze 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 York shows this code
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 York codes
Same part of the system as FH:
FH on other brands
The same characters do not always mean the same thing. Check the brand on your unit.
- Blueridge FH Anti-freeze frequency limiting (protection)
- Zone Air FH Drive limit (frequency reduction protection)
Questions people ask
Can I reset a York FH code myself?
Yes. Turn the system off at the breaker for five minutes, then restart it. If FH comes back, the fault is real and needs the checks above.
Is it safe to keep running a York showing FH?
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 York FH?
You can almost always clear this yourself with the steps below. A technician should check the charge if it persists.
Sources
- York M-Series Inverter-Driven Air Conditioning Units Service Manual (DHM18-42CMB21S), Troubleshooting 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.