Mitsubishi HMA100V Technical Manual page 149

Alarm Alarm text on the
no. display
E39 S. fault Tho-D
E40 HP alarm
E42 Inverter error
E45 Inverter error
E47 Inverter error
E48 Fan alarm
E49 LP alarm
E51 Inverter error
Description
Sensor fault, hot gas in outdoor unit (Tho-D).
The high pressure switch (63H1) is activated 5 times
within 60 minutes or under 60 minutes continu-
ously.
Voltage from the inverter outside the parameters
four times within 30 minutes.
Communication between PCB for inverter and control
PCB broken.
Inverter A/F module over current
Deviations in the fan speed in outdoor unit.
Too low value on the low pressure sensor 3times
within 60 minutes.
Continuous deviation on power transistor for 15
minutes.
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 165.
- Insufficient air circulation or blocked heat exchang-
er
- Open circuit or short circuit on input for high
pressure sensor (63H1)
- Defective high pressure sensor
- Expansion valve not correctly connected
- Service valve closed
- Defective control PCB in outdoor unit
- Low or no flow during heating operation
- Defective circulation pump
Also see the troubleshooting guide on page 166.
- Incoming power supply interference
- Service valve closed
- Insufficient amount of refrigerant
- Compressor fault
- Defective inverter PCB in outdoor unit
Also see the troubleshooting guide on page 167.
- Open-circuit in connection between PCBs
- Defective inverter PCB in outdoor unit
- Defective control PCB in outdoor unit
Also see the troubleshooting guide on page 168.
- Instantaneous power failure
Also see the troubleshooting guide on page 169.
- The fan must not rotate freely
- Defective control PCB in outdoor unit
- Defective fan motor
- Control PCB in outdoor unit dirty
- Fuse (F2) blown
Also see the troubleshooting guide on page 170.
- Open circuit or short circuit on input for low
pressure sensor
- Defective low pressure sensor
- Defective control PCB in outdoor unit
- Open circuit or short circuit on input for suction gas
sensor (Tho-S)
- Defective suction gas sensor (Tho-S)
Also see the troubleshooting guide on page 171.
- Defective fan motor
- Defective inverter PCB in outdoor unit
Also see the troubleshooting guide on page 173.
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Service
Alarm list