American Standard mini split error codes

All American Standard codes

73 codes. Type to filter the list.

No code matches that. Check the characters (b and 6, 0 and o, and E and F are easy to confuse) or try another brand.

How American Standard shows error codes

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.

Mitsubishi Electric-built units: Wall units without a wired controller signal a fault by blinking the operation indicator lamp; the code itself shows on a wired controller (MHK/PAR series) or on the wireless remote after entering its check mode (see your manual). On the outdoor unit, the control board LEDs blink the same code. P codes are indoor-unit faults, E codes are communication faults, F codes are outdoor-unit faults and U codes are outdoor-unit and compressor faults.

Brands built on the same platform

These brands share a code table with American Standard because the same factory builds them, so their pages describe the same faults: ACiQ, Ameristar, Mitsubishi Electric, TCL, Trane, Zone Air.