American Standard mini split error code PA

Common causes

• Zones set to opposite modes.
• A loose accessory connector.

How to fix it yourself

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

1. Set every zone to the same mode.
2. 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.

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

Not usually a fault.

Which American Standard units show PA

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 PA as "Preset mode conflict or indoor top-flow communication 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 PA:

All American Standard error codes

PA on other brands

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

• Blueridge PA AC current protection
• Zone Air PA Preset mode conflict or indoor top-flow communication fault