York AC Error Codes: What They Mean & What to Do

York organises its codes by letter, and the letter tells you which side of the system reported the fault: E codes are indoor-side and control faults, F codes are outdoor, inverter and sensor faults, and P codes are protection trips that stop the system to prevent damage. Multi-split and commercial installations add a separate CCM network fault series, which belongs to the building-controls domain rather than to a single unit.

Product families covered

• Split / inverter / multi-split

  The consolidated E / F / P / T / H code table.

• CCM network controller

  00# to 03# communication faults between the CCM and the main PCB, NIM module, function module or PC gateway.

Where the code is displayed — and why it matters

The same fault can be labelled differently depending on which display you read it from, so identify the display before looking the code up.

Indoor unit display

Shows the E, F or P code on residential splits.

Wired wall controller

Shows the same code set, often with the affected zone on multi-split systems.

CCM central controller

Shows the 00# to 03# network fault series — a different fault domain from the unit codes.

York code letters

The letter identifies the fault area before you know the exact code:

E

Indoor-side, sensor, memory and communication faults

F

Outdoor unit, inverter, compressor and outdoor sensor faults

P

Protection trips — pressure, temperature, overcurrent

T / H

Sensor circuit faults and control-network faults

00#–03#

CCM central controller network faults (multi-split / commercial)

How the families differ

• A single split reports faults for one indoor/outdoor pair, so an E7 communication fault narrows to wiring, terminations or the boards at either end.
• Multi-split and commercial systems add the CCM network series, where a fault can affect a whole group of units without any single unit being defective.
• York's VRF-specific YVAM and YMAE code sets were not isolated in our source material and are therefore not published here.

Documented York split, inverter and multi-split codes

Our York source is one comprehensive independent technical compilation checked for internal consistency rather than an official York service PDF — confirm against your model's documentation before repair decisions.

York CCM network controller faults

A network and building-controls fault domain rather than a refrigerant or electrical fault in one unit.

Before you act on a code

• P-series codes are protection trips: the system stopped deliberately, so clearing the code without finding the cause invites repeat failures.
• E0 and P7 indicate incoming supply phase problems — an electrical supply issue, not an AC fault, and it should be checked by a qualified electrician.
• York VRF-specific code sets are still in technical review and are not published here.

C Secondary source only

How to identify your system

1. Note the exact code and whether it appeared on the indoor unit, a wall controller or a central CCM controller.
2. Note whether one indoor unit or several run from the outdoor unit.
3. Photograph the indoor unit's model label before contacting a technician.

No code showing? Start from the symptom

• AC not cooling
• AC leaking water