Yorkguard VI will energize the X/L terminal to flash a light at the thermostat to notify the homeowner of a problem with the heat pump.
Fault Code Memory:
X/L Output Categories:
X/L | Condition |
2 flashes | Soft lockout - Reset with interruption of thermostat call. |
3 flashes | Hard lockout - Reset by cycling power to air handler. |
4 flashes | Wiring, sensor or control setting error. |
Status Code Display:
LED 1 (Red) | LED 2 (Green) | X/L | Description |
Off | Off | No power to control | |
Off | On | 1st stage operation (2 stage units only) | |
On | On | 2nd stage compressor or full capacity | |
Off | 2sec On, 2sec Off | Normal operation, no compressor | |
Off | Rapid flash | Call for compressor, short-cycle delay active |
Operational Fault Codes:
LED 1 (Red) | LED 2 (Green) | X/L | Description |
On | Off | 4 | Control Failure |
1 flash | Off | Off | High-pressure switch (not in lockout yet) |
2 flash | Off | 2 or 3 | High-pressure switch lockout - heat or cool |
3 flash | Off | 2 or 3 | High-pressure switch lockout - defrost |
4 flash | Off | 2 or 3 | Low-pressure switch lockout |
5 flash | Off | Off | Low voltage (< 19V) |
6 flash | Off | Off | Low voltage (< 16V) |
7 flash | Off | Off | Pipe freeze protection alert |
Sensor or Switch Fault Codes:
LED 1 (Red) | LED 2 (Green) | X/L | Description |
On | 1 flash | 2 | Outdoor sensor shorted |
On | 2 flash | 2 | Outdoor sensor open |
On | 3 flash | 2 | Liquid line sensor shorted |
On | 4 flash | 2 | Liquid line sensor open |
On | 5 flash | 2 or 3 | High discharge line temperature |
On | 6 flash | 2 or 3 | Low discharge line temperature |
On | 7 flash | 2 | Discharge line sensor shorted |
On | 8 flash | 2 | Bonnet sensor shorted |
On | 9 flash | Off | Fossil fuel mode setting error |
Wiring-related Fault Codes:
LED 1 (Red) | LED 2 (Green) | X/L | Description |
1 flash | On | 3 | Compressor contactor miswired |
2 flash | On | Off | Y2 present without Y1 |
4 flash | On | Off | O signal received in A/C-Only Mode |
5 flash | On | Off | W signal received in A/C-Only Mode |
6 flash | On | Off | W & O signal received in A/C-Only Mode |
7 flash | On | Off | W & O signal received in H/P Mode |
8 flash | On | Off | Defrost Curve Jumper Error |