Description
E54
Alarm text on the
display
Alarm
no.
May be due to
S. fault LPT
Sensor fault, low pressure sensor in
outdoor unit
.
- Open-circuit or short-circuit on sensor input
- Sensor does not work (see “Temperature sensor”
section)
- Defective control PCB in outdoor unit
- Fault in the refrigerant circuit
Also see the troubleshooting guide on page 175.
E57 Low refrigerant Insufficient refrigerant is detected at initial startup
in cooling mode.
- Service valve closed
- Loose connection of sensor (BT15 or BT3)
- Defective sensor (BT15 or BT3)
- Insufficient amount of refrigerant
Also see the trouble shooting guide on page 176.
E59 Inverter error Compressor fails to startup for 14 times
(7 patterns × 2 times)
- Defective outdoor fan motor
- Defective inverter PCB in outdoor unit
- Compressor fault
- Incoming power supply interference
Also see the trouble shooting guide on page 177.
E53 S. fault Tho-S
- Defective control PCB in outdoor unit
Also see the troubleshooting guide on page 174.
- Open-circuit or short-circuit on sensor input
- Sensor does not work (see “Temperature sensor”
section)
Sensor fault, suction gas in
outdoor unit
(Tho-S).
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