York Heat Pump: YZT
Re: Communicating Defrost Board
Fault Code Memory:
Status Code Display | |||
LED | Segment 1 | Segment 2 | Description |
Off | No power to control | ||
2s on 2s Off | Normal operation - No call for compressor | ||
0.1s On 0.1s Off | d | 5,4,3,2,1 | COOLING Short-cycle delay timer |
0.1s On 0.1s Off | d | 5,4,3,2,1 | HEATING Short-cycle delay timer |
On | C | 1 | COOLING 1st Stg Compressor Operation |
On | C | 2 | COOLING 2nd Stg Compressor Operation |
On | H | 1 | HEATING 1st Stg Compressor Operation |
On | H | 2 | HEATING 2nd Stg Compressor Operation |
On | A | 1 | Aux Heat 1 (below BP) |
On | A | 2 | Aux Heat 2 (below BP) |
On | d | r | COOLING Demand Response (Utility input) |
On | d | r | HEATING Demand Response (Utility Input) |
On | E | 1 | Emergency Heat Stg 1 |
On | E | 2 | Emergency Heat Stg 2 |
On | o | r | Oil Return |
On | d | d | Demand Defrost |
On | d | c | Calibration Defrost |
On | t | d | Time & Temperature Defrost |
On | F | d | Forced Defrost |
Operational Fault Codes | ||||
LED | Segment 1 | Segment 2 | Description | Control Response |
On | 0 | 0 | Control Failure | None |
On | 0 | 1 | High-pressure switch (not in lockout yet) | None |
2 flash | 0 | 2 | 2 High-pressure faults in 6 hours | Soft Lockout |
3 flash | 0 | 2 | 4 High-pressure faults in 12 hours | Hard Lockout |
2 flash | 0 | 3 | 2 DEFROST High-pressure faults in 6 hours | Soft Lock |
3 flash | 0 | 3 | 4 DEFROST High-pressure faults in 12 hours | Hard Lockout |
2 flash | 0 | 4 | Low-pressure switch fault | Soft Lockout |
3 flash | 0 | 4 | 4 Low-pressure faults in 12 hours | Hard Lockout |
On | 0 | 5 | LTCO Active | None |
On | 0 | 6 | Low Voltage < 19.2VAC | None |
On | 0 | 7 | Low Voltage < 16VAC | None |
On | 0 | 8 | Pipe Freeze Protection | None |
On | 0 | 9 | Outdoor Sensor shorted in Cooling | ODF operates at Max |
On | 0 | 9 | Outdoor Sensor shorted in Heating | None |
2 flash | 0 | 9 | Outdoor Sensor shorted in Heating | Soft Lockout |
On | 1 | 0 | Outdoor Sensor Open in Cooling | ODF operates at Max |
On | 1 | 0 | Outdoor Sensor Open in Heating | None |
2 flash | 1 | 0 | Outdoor Sensor Open in Heating | Soft Lockout |
2 flash | 1 | 1 | Coil Sensor Shorted | Soft Lockout |
2 flash | 1 | 2 | Coil Sensor Open | Soft Lockout |
2 flash | 1 | 3 | Discharge Sensor Shorted | Soft Lockout |
2 flash | 1 | 4 | Discharge Sensor Open | Soft Lockout |
On | 1 | 5 | Discharge Temp > 263 F | None |
2 flash | 1 | 5 | Discharge Temp > 263 F (3 times) | Soft Lockout |
3 flash | 1 | 5 | Discharge Temp > 263 F (12 times) | Hard Lockout |
On | 1 | 6 | Discharge Temp < 90 F | None |
2 flash | 1 | 6 | Discharge Temp < 90 F (3 times) | Soft Lockout |
3 flash | 1 | 6 | Discharge Temp < 90 F (12 times) | Hard Lockout |
2 flash | 1 | 7 | Bonnet Sensor Shorted | Soft Lockout |
Wiring-related Fault Codes | ||||
LED | Segment 1 | Segment 2 | Description | Control Response |
2 flash | 1 | 8 | O Received in A/C Only Mode | Soft Lockout |
2 flash | 1 | 9 | W Received in A/C Mode | Soft Lockout |
2 flash | 2 | 0 | W & O Received in A/C Mode | Soft Lockout |
2 flash | 2 | 4 | W & O Received in H/P Mode | Soft Lockout |
2 flash | 2 | 5 | Was A/C Mode, Now H/P Mode | Operates in A/C Mode |
On | 2 | 6 | Was H/P Mode, Now A/C Mode | Operates in Heating |