Fault Table; Incidents - York VCH-25A Installation Manual

2.2 Fault table

The red LED on the YKNOpen electronic board is responsible for showing the state of faults on the unit:
• When the red LED remains off there are no faults in the unit.
• If the red LED does two series of flashes in a constant sequence, there is a fault which must be
checked in the following table:
Fault table (red LED)
Red LED flashes
1st Series 2nd Series
1, 2 or 3
4

2.3 Incidents

The green LED on the YKNOpen electronic board is responsible for showing the state of incidents on
the unit:
• If the green LED flashes in a constant sequence, there are no incidents in the unit.
• If the green LED does three series of flashes in a constant sequence, there is an incident which must
be checked in the following table:
N O T E
The first series indicates the affected circuit: one flash for the first compressor, two for the second,
three for the third and four for miscellaneous incidents. A short pause follows. The second and third
series specify the direct cause of the incident.
1 Discharge temperature exceeded
High-pressure switch, outdoor fan thermal switch or compressor
2
module thermal switch
3 Low pressure switch
4 Indoor fan thermal switch
5 Repeated cold start-up or suction temperature < ‑25 °C
1 Gas control 1 or resistor 1 fault
2 Gas control 2 or resistor 2 fault
3 Resistor stage 3 fault
4 Resistor stage 4 fault
Fault in economiser or hot water coil (outdoor supply probe, water
5
return)
Smoke or high temperature detection (accessory) or supply tem‐
6
perature > 80 °C
Wiring diagrams
Fault table
Description
2
2.2
49