DIY HVAC Tools

MRCOOL mini split code FC

Forced cooling test mode.

  • TypeStatus, not a fault
  • SystemDisplay
  • Can I fix it?Usually a homeowner fix
  • Applies toindoor unit display (four-character codes)

What FC means on a MRCOOL

Forced cooling is a service test mode, usually started by pressing the manual button on the indoor unit twice. The unit runs cooling at full output regardless of the set temperature.

On this platform, FC is a status, not a fault: the unit is telling you what it is doing; nothing is wrong.

What to do

You can almost always clear this yourself with the steps below.

  1. Press the manual button on the indoor unit again, or turn the unit off with the remote, to exit forced cooling.

When to call a technician

This is not a fault. No technician is needed unless it will not clear.

Which MRCOOL units show FC

This page applies to MRCOOL DIY 2nd/3rd Gen, DIY 4th Gen, DIY Multi-Zone, Advantage, Olympus and Easy Pro units on the indoor unit display (four-character codes). MRCOOL's own documentation lists FC as "Forced cooling test mode", the same definition used across the Midea platform (four-character codes) 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 MRCOOL shows this code

The indoor display shows the code in place of the temperature. On DIY 4th Gen units a four-character code alternates between its two halves (EL, then 0C); write down both. The MRCOOL app also reports the current fault.

EH and EL are indoor-side faults, EC is an outdoor-side fault, and PC is an outdoor protection: the unit stopped itself to prevent damage.

Other MRCOOL codes

Same part of the system as FC:

dFDefrost cycle runningCLFilter cleaning reminderAPWi-Fi pairing (access point) modeFPLow-temperature heating hold (46°F freeze-protection mode)LLRemote or wired controller lockedcFAnti-cold-air (heating warm-up)CPRemote on/off contact open
E0Indoor unit EEPROM parameter error / Outdoor unit EEPROM parameter error (outdoor display)E1Communication error between indoor and outdoor unitsE2Zero-crossing signal detection error / Communication error between the outdoor unit and the indoor units (outdoor display)E3Indoor fan speed out of control (indoor fan motor fault) / Communication error between outdoor main board and IPM board (outdoor display)E4Indoor room temperature sensor (T1) open or short circuit / Outdoor temperature sensor fault: coil (T3), ambient (T4), discharge (T5) or a zone coil outlet (T2B)E5Evaporator coil temperature sensor (T2) open or short circuit / Over-voltage or under-voltage protection (outdoor display)ECRefrigerant leak detected (low refrigerant charge)F0Overload current protection (compressor over-current)

All MRCOOL error codes

FC on other brands

The same characters do not always mean the same thing. Check the brand on your unit.

Questions people ask

Is FC on a MRCOOL mini split an error?

No. FC is a status message: forced cooling test mode. Forced cooling is a service test mode, usually started by pressing the manual button on the indoor unit twice.

Do I need a technician for MRCOOL FC?

You can almost always clear this yourself with the steps below. This is not a fault. No technician is needed unless it will not clear.

Sources

  • MRCOOL DIY 3rd Gen and 4th Gen installation manuals (error code tables)
  • Midea residential split service manual

Updated September 2026. Codes and definitions vary by model year. If your manual disagrees with this page, your manual wins. Send a correction.