American Standard mini split error code P0

Common causes

• A blocked outdoor coil or failed fan.
• Low or unstable supply voltage.
• A failing compressor.

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. Look at the outdoor unit: clear leaves, cottonwood fluff, snow or ice from the coil and make sure the fan can spin freely and nothing is stacked against the cabinet.
3. If you own a multimeter and are comfortable using it, measure the supply voltage at the outdoor unit's L1 and L2 terminals with the unit running. A 230 V system should read roughly 208 to 253 VAC.
4. Do not keep resetting it.

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

Technician diagnosis of the module and compressor.

Which American Standard units show P0

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 P0 as "IPM module protection", 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 P0:

All American Standard error codes

P0 on other brands

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

• Pioneer P0 Inverter module (IPM) malfunction
• Blueridge P0 IPM reset (drive module restarted) / Inverter module (IPM) malfunction
• Gree P0 IPM reset (drive module restarted)
• Zone Air P0 IPM module protection
• Heil P0 Inverter module (IPM) malfunction / IPM reset (drive module restarted)
• ACiQ P0 Inverter module (IPM) malfunction / IPM module protection