What does Alert A017 mean on my Carrier Air Conditioner?
Alert A017 on your Carrier Air Conditioner indicates that the MBB 5VDC voltage is out of range, typically caused by an MBB failure or the supply voltage being out of range. When this alert is active, transducer inputs will be in error. The alert should automatically clear when the voltage rises above 4.5 volts DC.
What does Fault F018 mean on my Carrier Air Conditioner?
Fault F018 on your Carrier Air Conditioner indicates an MBB EEPROM failure, meaning the serial EEPROM chip on the MBB, which stores the unit’s configuration, is not responding. Recovery is automatic, but you might need to replace the MBB board. Before replacing the board, try cycling the power to the control.
What does Alert A019 mean on my Carrier 50FF Air Conditioner?
Alert A019 on your Carrier Air Conditioner indicates an MBB clock failure, meaning the RTC clock chip on the MBB is not responding. Automatic recovery is possible, but MBB board replacement might be necessary. Before replacing the board, try cycling power to the control and reconfiguring the time and date.
What does Fault F020 mean on my Carrier 50FF Air Conditioner?
Fault F020 on your Carrier Air Conditioner indicates a software error, meaning the software on the MBB is not responding. Recovery is automatic if the software can reset the board. If not, try cycling the power to the control before considering board replacement.
What does Alert A100 mean on my Carrier 50FF Air Conditioner?
Alert A100 on your Carrier Air Conditioner indicates a SAT sensor failure. This is usually due to a faulty thermistor, a shorted or open thermistor caused by a wiring error, or a loose connection. While this alert is active, economizer cooling cannot occur.
General| Series | 50FF |
|---|---|
| Refrigerant | R-410A |
| Product Type | Air Conditioner |
| Cooling Capacity | 1.5 to 5 Tons |
| Operating Voltage | 208/230V |
| Dimensions (H x W x D) | Varies by model |
| Weight | Varies by model |
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