American Standard mini split error code EE

Common causes

• A surge or lightning event.
• A failed outdoor board.
• A replacement board not programmed for the model.

How to fix it yourself

Do the reset and the visual checks, but the underlying repair needs a technician with a meter and the service manual.

1. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.
2. If the code comes straight back after a reset, the fault is real and not a glitch.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

If a reset does not clear it, the board needs replacement or reprogramming.

Which American Standard units show EE

This page applies to American Standard 4TXK / 4MXW / 4TYK hi-wall inverter and Mitsubishi Electric-built units units on the 4TXK / 4MXW / 4TYK series. American Standard's own documentation lists EE as "Outdoor EEPROM fault", the same definition used across the TCL platform 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 American Standard shows this code

4TXK / 4MXW / 4TYK series: The indoor display shows the code in place of the set temperature. E codes are faults: something has failed and needs diagnosis. P, H, d and F codes are protections: the system stopped or throttled itself to prevent damage, and many clear on their own once conditions return to normal.

Other American Standard codes

Same part of the system as EE:

All American Standard error codes

EE on other brands

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

• Blueridge EE EEPROM (memory) error on a control board
• Zone Air EE Outdoor EEPROM fault