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York Yorkguard VI Status and Fault Codes

Article ID: 35
Last updated: 7 Nov, 2017

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:

  • The control will store the last 5 error codes.  As new error codes are stored, the oldest is deleted.
  • The stored error codes can be recalled by pressing the LAST ERROR button for one to five seconds with no thermostat inputs to the board.
  • The display will show the last 5 error codes, the most recent first.
  • Fault codes can be cleared by pressing the LAST ERROR button for more than 5 seconds.
    • The control will flash both LEDs twice to indicate that the memory has been cleared.

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
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Article ID: 35
Last updated: 7 Nov, 2017
Revision: 8
Access: Public
Views: 4908
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