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What is a Fo Code On Mini Split?

What is a Fo Code On Mini Split?

Have you ever encountered an error code with your mini-split system? Chances are it was a “FO” code, or Fault Omission. This code can be caused by several different issues and can generally be resolved without too much hassle. In this article, we will explore what FO codes are, what they indicate, and how to resolve them if they arise on your system. We will also look at some of the common causes of the issue and provide helpful tips to prevent future occurrences. Read on to learn more about FO codes and how you can get your mini-split up and running again in no time!

What is a Fo Code on Mini Split?

A Fo code on mini split is a code that is used to indicate the air flow rate. This code is often used in conjunction with the EER and COP ratings. The higher the number, the greater the air flow rate.

How to Fix a Fo Code on Mini Split

If your mini split is displaying a FO code, it means that there is a blockage in the outdoor unit. The most common causes of this are leaves or debris blocking the air intake or the fins on the heat exchanger.

To fix a FO code on your mini split, you will need to:

1. Remove any leaves or debris from around the outdoor unit.

2. Clean the fins on the heat exchanger with a soft brush.

3. Check that there is nothing blocking the air intake of the outdoor unit.

4. If the problem persists, call a qualified technician to service your mini split.

Possible Causes of a Fo Code on Mini Split

There are several potential causes of an Fo code on a mini split system. One possibility is that the outdoor unit is not receiving enough power. Another possibility is that the outdoor unit is not properly grounded. Additionally, the filters in the indoor unit may be dirty or clogged, preventing proper air flow.


A fo code on a mini split is an error message that indicates something has gone wrong with the unit. It can be caused by a range of things, from low refrigerant to poor electrical connections, and needs to be addressed as soon as possible in order to prevent further damage. We hope this article has provided some valuable insight into what a fo code is and how it can be diagnosed and fixed. If you ever run into this issue with your own mini-split system, don’t hesitate to contact an HVAC professional for help!