Hm-T- - Mitsubishi HMA100V Technical Manual

Alarm Alarm text on the
no. display
E53 S. fault Tho-S
E54 S. fault LPT
E57 Low refrigerant
E59 Inverter error
Description
Sensor fault, suction gas in outdoor unit (Tho-S).
Sensor fault, low pressure sensor in outdoor unit.
Insufficient refrigerant is detected at initial startup
in cooling mode.
Compressor fails to startup for 14 times
(7 patterns × 2 times)
May be due to
- Open-circuit or short-circuit on sensor input
- Sensor does not work (see "Temperature sensor"
section)
- 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)
- Defective control PCB in outdoor unit
- Fault in the refrigerant circuit
Also see the troubleshooting guide on page 175.
- 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.
- 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.
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Service
Alarm list