DIY HVAC Tools

MRCOOL mini split code CL

Filter cleaning reminder. Also shown as CF, FC.

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

What CL means on a MRCOOL

A run-hour timer has expired and the unit is reminding you to clean the filters. Nothing is wrong; the unit keeps running.

On this platform, CL 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. Wash the mesh filters behind the front panel, let them dry, and reinstall.
  2. Clear the reminder using the remote: on most models press and hold the LED or Reset button (see your manual), or turn the unit off and back on with the remote.

When to call a technician

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

Which MRCOOL units show CL

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 (classic two-character codes). MRCOOL's own documentation lists CL as "Filter cleaning reminder", the same definition used across the Midea platform (classic 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.

E codes are faults in the indoor unit or its communication link, F codes are faults on the outdoor side, and P codes are protections: the outdoor unit has stopped itself to prevent damage. EC is the refrigerant leak check.

Other MRCOOL codes

Same part of the system as CL:

dFDefrost cycle runningAPWi-Fi pairing (access point) modeFPLow-temperature heating hold (46°F freeze-protection mode)FCForced cooling test modeLLRemote 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

CL on other brands

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

Questions people ask

Is CL on a MRCOOL mini split an error?

No. CL is a status message: filter cleaning reminder. A run-hour timer has expired and the unit is reminding you to clean the filters.

Do I need a technician for MRCOOL CL?

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.