Table Of Contents - Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual

1.11.2 Troubleshooting flow
(1) List of troubles
Remote control display
None Operates but does not cool.
None Operates but does not heat.
None Earth leakage breaker activated
None Excessive noise/vibration (1/3)
None Excessive noise/vibration (2/3)
None Excessive noise/vibration (3/3)
None Power supply system error (Power supply to indoor control PCB)
None Power supply system error (Power supply to remote control)
INSPECT I/U INSPECT I/U (When 1 or 2 remote controls are connected)
INSPECT I/U INSPECT I/U (Connection of 3 units or more remote controls)
Communication error at initial operation
WAIT
None No display
E1 Remote control communication circuit error
E5 Communication error during operation
E6 Indoor heat exchanger temperature thermistor anomaly
E7 Return air temperature thermistor anomaly
E8 Heating overload operation
E9 Drain trouble
E10 Excessive number of connected indoor units (more than 17 units) by controlling with one remote control
E16 Indoor fan motor anomaly
E19 Indoor unit operation check, drain motor check setting error
E20 Indoor fan motor rotation speed anomaly
E28 Remote control temperature thermistor anomaly
E35 Cooling overload operation
E36 Discharge pipe temperature error
E37 Outdoor heat exchanger temperature thermistor anomaly
E38 Outdoor air temperature thermistor anomaly
E39 Discharge pipe temperature thermistor anomaly
E40 High pressure error (63H1 activated)
E41 Power transistor overheat
E42 Current cut
E45 Communication error between inverter PCB and outdoor control PCB
E47 Inverter PCB A/F module anomaly (Model FDC71 only)
E48 Outdoor fan motor anomaly
E49 Low pressure error or low pressure sensor anomaly
E51 Inverter and fan motor anomaly
E53 Suction pipe temperature thermistor anomaly
E54 Low pressure sensor anomaly
E57 Insufficient refrigerant amount or detection of service valve closure
E59 Compressor startup failure
Description of trouble
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