Toshiba RUAGP Series Original Owner's Manual page 84

Error code causes and solutions. – part 3
Error code
Description
(Hexadecimal)
63
Abnormal DGT
(continued)
64 Abnormal SGT
65 Refrigerant shortage
66 Comp. out of range
67 Compressor unstarted failure
71 Exp. valve1 abnormal
72 Exp. valve2 abnormal
73
4way valve abnormal
74 Equalize valve error
75 Refrig injection line failure
7A Cooling fan abnormal
A0 COMP IGBT short
The air heat exchanger is dirty (cooling mode)
The water heat exchanger is dirty (heating mode)
Overcharge of refrigerant after maintenance
Discharge gas thermistor error value
Equalizer valve error
Refrigerant leak
Expansion valve error
Water temperature increased/decreased rapidly (cooling
mode).
Sharp fluctuation in flow rate
Suction gas thermistor error value
Insufficient antifreeze concentration.
Refrigerant leak
High-pressure sensor error value
Load fluctuations are too large
Outside air temperature is outside the specified working
range.
The chilled (warm) water temperature is outside the
working range.
The power supply's voltage or frequency is outside the
specified working range.
Strong wind
Short circuit
Compressor fault
Incorrect or loose wiring on the IPDU board of the
compressor terminal
Incorrect wiring or loose wiring of the compressor
terminal
The power supply (voltage, frequency) is outside the
working range.
Open circuit in control wiring, loose terminal
Expansion valve error
Open circuit condition or loose connection in control
wiring.
Suction gas thermistor error value
Coil gas thermistor error value (heat pump only)
Low-pressure sensor error value
EEV board error
Same as "Exp. valve1 abnormal"
Four-way valve main unit error
Four-way valve coil error
Open circuit condition or loose connection in control
wiring.
(Note 2)
Thermistor error value (discharge, suction, coil)
EEV board error
Outside air temperature is outside the specified working
range.
Equalizer valve main unit error
Equalizer valve coil error
Open circuit condition or loose connection in control
wiring.
High-pressure and low-pressure sensor error value
EEV board error
Injection 2-way valve body or coil fault
Injection expansion valve body or coil fault
EEV board fault
Open circuit in control wiring, loose terminal
Clogged strainer
Check valve operation fault
Cooling fan fault
Open circuit condition or loose connection in control
wiring.
Heat sink sensor error value
EEV board error
Ventilation path obstructed.
Compressor error
Compressor PWM board error
Compressor drive module error
The power supply's voltage or frequency is outside the
specified working range.
Open circuit condition or loose connection in control
wiring.
Cause
Clean the air heat exchanger.
Clean the water heat exchanger (chemical cleaning).
Charge unit to specified refrigerant amount.
Repair wiring / change thermistor.
Same as "Equalizer valve error"
Repair leaks and charge refrigerant.
Replace expansion valve.
Same as "Low Water [T] Cutout"
Same as "Low flow cutout"
Repair wiring / change thermistor.
Replenish antifreeze
Repair leaks and charge refrigerant.
Repair wiring / change sensor.
Reduce fluctuations
Operate the unit within the specified working range.
Operate the unit within the specified working range.
Operate the unit within the specified working range.
Install windbreak and window baffle.
Remove cause of short circuit.
Replace the compressor.
Repair the wiring.
Repair the wiring.
Operate the unit within the working range.
Repair the control wiring.
Replace expansion valve.
Repair the control wiring.
Repair wiring / change thermistor.
Repair wiring / change thermistor.
Repair wiring / change sensor.
Replace EEV board.
Same as "Exp. valve1 abnormal"
Replace four-way valve main unit.
Replace four-way valve coil.
Repair the control wiring.
Repair wiring / change thermistor.
Replace EEV board.
Operate the unit within the specified working range.
Replace equalizer valve main unit.
Replace equalizer valve coil.
Repair the control wiring.
Repair wiring / change sensor.
Replace EEV board.
Replace the injection 2-way valve body or coil.
Replace the injection 2-way expansion valve or coil.
Replace the EEV board.
Repair the control wiring.
Replace the strainer.
Replace the check valve.
Replace cooling fan.
Repair the control wiring.
Repair wiring / change sensor.
Replace EEV board.
Clear ventilation path.
Replace compressor.
Replace PWM board.
Replace compressor drive module.
Operate the unit within the specified working range.
Repair the control wiring.
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Required action