You’ve got a York thermostat, and it doesn’t work for some reason? Use the York thermostat troubleshooting manual from this page: it describes the most common technical problems, their possible reasons, and the ways to fix the issues. The tables cover different York models, and also include error codes.
York LX Series Thermostat Troubleshooting
| Problem | Cause | Solution |
|---|---|---|
| The air conditioning does not attempt to turn on. | The compressor timer lockout may prevent the air conditioner from turning on for a period of time | Consult the Owner’s Manual in the Installer Setup section to defeat the Cycles Per Hour |
| The display is blank | Lack of proper power | Make sure the power is on to the furnace and that you have 24vac between R & C |
| The air conditioning does not attempt to turn on. | The cooling setpoint is set too high | Lower the cooling setpoint or lower the cooling set- point limit. |
| The heating does not attempt to turn on | The heating setpoint is set too low. | Raise the heating setpoint or raise the heating set- point limit |
| When controlling a residential heat pump, and asking for cooling, the heat comes on. | The thermostat reversing valve jumper is set for “B”. | Set the reversing valve jumper for “0”. |
| When calling for cooling, both the heat and cool come on | The thermostat equipment jumper is configured for “HP” and the HVAC unit is a Gas/Electric. | Set the equipment jumper for “Gas” |
| When the Program button is pressed, the display reads “DISABLED”. | Program mode is set to “NON PROGRAM”. | Set Program Mode to 1. 5/2, or 7 Day |
York ARTTP001S Thermostat Troubleshooting
| Problem | Solution |
|---|---|
| Thermostat has no dlsplay | Check wiring between thermostat and sensor. Incorrect wiring can damage the thermostat, transformer or blow a fuse. Check 24VAC supply |
| Thermostat reads “AC” | 24VAC power is disconnected |
| Not sure if dlsplay Is showing local or remob temperature | Breathe on the wall near the bottom left corner of the thermostat. Temperature will go up for a few seconds if sensing locally |
| Thermostat displays very high temperature | Wires on sensor element are shorted together. Separate them |
| Thermostat displays very low temperature | Check wiring of probe or duct sensor. Sensor element is not connected to board or is broken |
| Temperature display jumps up and down several degrees within seconds | Thermostat requires a few seconds to stabilize after power is turned on. If display continues to be erratic, there is too great a distance between the indoor sensor box and the duct sensor. Move the box closer to the duct sensor or use shielded cable |
York DPC1 Thermostat Troubleshooting
| Code | Designation |
|---|---|
| 11/21/31 | Compressor discharge temperature surpased or short circuited probe |
| 12/ 22 /32 | High Pressure switch, outdoor fan overload or compressor motor protection module |
| 13/23/33 | Low Pressure switch |
| 14 | Indoor fan thermal switch |
| 15/25/35 | Repeated start-ups in cool, or suction temperature < -25°C |
| 16 | Liquid temperature < -30°C |
| 41 | Gas 1 or electrical heater 1 |
| 42 | Gas 2 or electrical heater 2 |
| 43 | Electrical heater 3 |
| 44 | Electrical heater 4 |
| 45 | Economizer or hot water coil |
| 46 | Smoke detector, fire thermostat or air discharge temperature probe (rooftop only) >80°C |
| 91 | Selected probe not valid or short circuited probe |
| 92 | Thermostat internal probe not calibrate |
| 93 | No communication between the thermostat and the main PCB (Yklon) |
| 94 | Failure with terminal “AL” connected |
| 95 | Digital probe S5 not detected |
| 96 | Digital probe S6 not detected |
| 97 | Digital probe S7 not detected |
| 98 | Digital probe S8 not detected |
| 99 | Outdoor digital probe not detected |