MRCOOL mini split code dF

What to do

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

1. Wait. Heating resumes on its own.
2. If dF shows for more than about 15 minutes at a time, or cycles constantly, the outdoor coil may be blocked or the defrost sensor (T3) faulty.

When to call a technician

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

Which MRCOOL units show dF

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 dF as "Defrost cycle running", 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 dF:

All MRCOOL error codes

dF on other brands

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

• Pioneer dF Defrost cycle running