If you’re familiar with error codes output by York air conditioners, you can remove some of malfunctions on your own. Refer to the check list below to identify the at fault parts. You may use it as a guide for troubleshooting the air conditioner system on your own or tell this code to the techs if you decide to call for service.
| Code | Description |
| 11/21/31 | Discharge temperature exceeded |
| 12/22/32 | High-pressure switch, outdoor fan thermal switch or compressor module ther- mal switch (depending on model) |
| 13/23/33 | Low pressure switch |
| 14 | Indoor fan thermal switch |
| 15/25/35 | Repeated cold start-up or suction temperature < -25 °C |
| 41 | Gas control 1 or resistor 1 fault |
| 42 | Gas control 2 or resistor 2 fault |
| 43 | Resistor stage 3 fault |
| 44 | Resistor stage 4 fault |
| 45 | Fault in economiser or hot water coil (outdoor supply, water return sensor) |
| 46 | Smoke detector, high temperature, or supply temperature >80 °C |
| 91 | Ambient sensor open or short circuited |
| 92 | Internal sensor not calibrated |
| 93 | Communication error |
| 94 | fault with AL terminal connected |
| 95 | S5 digital sensor not detected |
| 96 | S6 digital sensor not detected |
| 97 | S7 digital sensor not detected |
| 98 | S8 digital sensor not detected |
| 99 | Digital outdoor sensor not detected |
| No. | failure description | indoor running LED flash times |
| 1 | ambient temperature sensor failure | 1 |
| 2 | coil temperature sensor failure | 2 |
| 3 | EEPROM failure | 4 |
| 4 | communication failure between indoor and outdoor | 7 |
| 5 | communication failure between indoor and wired controller | 8 |
| 6 | drainage failure | 12 |
| 7 | current detecting at 0 point | 13 |
| 8 | assistant coil temperature sensor failure | 15 |
| 9 | outdoor failure | indoor timer LED flash |