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Yorkguard IV & V Fault Codes

Article ID: 43
Last updated: 23 Oct, 2020

Yorkguard IV and V

Re: Lockout Codes / Fault Codes

The Yorkguard IV and V boards both have diagnostic functionality that will energize the X/L terminal to flash a light at the indoor thermostat if abnormal operating conditions occur.

  • Unlike the Yorkguard VI, the number of flashing lights on the thermostat will be the same as the diagnostic flash code on the outdoor unit.

The "lockout" can be Reset at the thermostat by: 1) cycling power to the air handler or 2) turning the thermostat system switch "Off" and then back to "On".


LOCKOUT CODES:

Flashes Description
Heartbeat Normal operation (No Faults)
2 Hi pressure cut-out open
3 High compressor discharge temperature
4 Low compressor discharge temperature
5 Default defrost (liquid line temp too cold)
6 Discharge (or any) sensor open or shorted
7 Outdoor sensor open or shorted
8 Liquid line sensor open or shorted
9 Bonnet sensor shorted
Fast Flash Analyzer plugged-in

WHAT TO LOOK FOR:

Flash Cooling Heating
2
  • Bad condenser fan motor
  • Bad cond fan capacitor
  • Dirty outdoor coil
  • Overcharged
  • Bad indoor fan motor
  • Bad id fan capacitor
  • Dirty indoor coil
  • Overcharged
3
  • Low refrigerant charge
  • Bad I/D expansion valve
  • Clogged filter drier
  • Low refrigerant charge
  • Bad O/D exp. valve
  • Clogged filter drier
4
  • No power to O/D unit
  • Bad compr capacitor
  • Bad compressor
  • Bad contactor
  • Burnt wires to compressor
  • Bad sensor
  • No power to O/D unit
  • Bad compr capacitor
  • Bad compressor
  • Bad contactor
  • Burnt wires to compr
  • Bad sensor
  • Un-insulated sensor
  • Overcharged
5
  • N/A
  • Bad O/D fan motor
  • Bad O/D fan capacitor
  • Low refrigerant charge
  • Bad O/D exp valve
  • Bad sensor
6
  • Bad sensor
  • Bad wiring
  • Check all 3 sensors
  • Bad sensor
  • Bad wiring
  • Check all 3 sensors
7
  • Bad sensor
  • Bad wiring
  • Bad sensor
  • Bad wiring
8
  • Bad sensor
  • Bad wiring
  • Bad sensor
  • Bad wiring
9
  • Bad sensor
  • Bad wiring
  • Bad sensor
  • Bad wiring

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Article ID: 43
Last updated: 23 Oct, 2020
Revision: 8
Access: Public
Views: 2414
Comments: 0
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