Johnson Controls York YKN2Open board Technical Information page 25

5 Malfunctions
5.2 Causes
In the event that more than one incident is produced, only the incident detected with the highest priority
is signalled, provided that it has not yet been restored. Inasmuch as they are restored, the other existing
incidents that have not yet been restored are displayed.
Flashes
1
1, 2 or 3
2
1
2
3
4
4
5
6
Faults
Faults or lockouts stop the unit.
They are signalled by a red LED on the board using a thermostat and a relay is activated on the board.
N O T E
If there are no faults, the LED is switched off.
When a fault is produced, the LED passes through two flashing sequences.
1. The first indicates the affected compressor:
• One flash for stage 1.
• Two flashes for stage 2.
• Three flashes for stage 3.
• Four flashes if an accessory is concerned.
2. The second sequence is produced after a brief pause and indicates the fault detected.
3. There is a long pause and the sequence is produced again.
In the event that more than one alarm is produced, the incident detected with the highest priority that has
not yet been restored is signalled.
22
Type
1
2 Probes
3
1
Temperature
2
1
2
3 Probes
4
5
1 Thermostat
1
2
Auxiliary heat
3
4
1
2
3 Temperature
4
5
1
2
3
Others
4
5
6
1
Recovery system
2
Incident
Discharge probe open or short circuited
Liquid probe open or short circuited
Suction probe open or short circuited
Repeated defrosting
The discharge temperature is not recovered
Supply probe open or short circuited
Return probe open or short circuited
Outdoor probe open or short circuited
Water probe open or short circuited
Fault in the enthalpy probes
Signal Y1 without signal G
Heating element thermal switch 1
Heating element thermal switch 2
Heating element thermal switch 3
Heating element thermal switch 4
The water coil temperature is not recovered
Outdoor temperature too low
Water coil performing antifreeze operation
Supply temperature above 55 °C
Supply temperature below 25 °C with gas
Defrost cycle
There is at least one accessory not found
Air quality demand
Dirty filters
Presence sensor is unoccupied
Suction temperatures < 0 °C with economiser
Energy recovery wheel motor trip switch
Energy recovery fan motor trip switch