MRCOOL mini split error codes

All MRCOOL codes

61 codes. Type to filter the list.

No code matches that. Check the characters (b and 6, 0 and o, and E and F are easy to confuse) or try another brand.

How MRCOOL shows error codes

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.

indoor unit display (classic two-character codes): The code appears on the indoor unit's LED display in place of the set temperature. Some models also blink the indicator lamps in a pattern that matches the code. 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.

indoor unit display (four-character codes): The display shows a two-letter prefix and a two-character suffix, either together (EH60) or alternating (EH, then 60). Write both parts down; the suffix is what identifies the 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.

multi-zone outdoor unit display: These codes appear on the small LED display on the multi-zone OUTDOOR unit's control board (behind the service panel, or visible through a window on some models). The indoor units show their own, different codes for the same fault, so check which display you are reading. On the outdoor display, E codes are outdoor faults, F codes identify which zone's coil sensor failed (F1 = zone A, F2 = zone B, and so on), and P codes are protections.

Brands built on the same platform

These brands share a code table with MRCOOL because the same factory builds them, so their pages describe the same faults: ACiQ, AirEase, Arcoaire, Arctic King, Armstrong Air, Blueridge, Bosch, Bryant, Carrier, Comfortmaker, Concord, Day & Night, Della, Ducane.